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<title>Document</title></head><body><div id="i0813f1822f074a21aa74286e31082142_1"></div><div style="min-height:50.4pt;width:100%"><div><font><br></font></div></div><div style="margin-top:2.4pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">As filed with the Securities and Exchange Commission on May 13, 2021</font></div><div style="margin-top:0.5pt;padding-right:5.9pt;text-align:right"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Registration No. 333-</font></div><div style="margin-top:1.55pt;padding-left:95.65pt;padding-right:95.65pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:14pt;font-weight:700;line-height:120%">UNITED STATES</font></div><div style="margin-top:0.7pt;padding-left:95.67pt;padding-right:95.67pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:14pt;font-weight:700;line-height:120%">SECURITIES AND EXCHANGE COMMISSION</font></div><div style="margin-top:0.15pt;padding-left:95.65pt;padding-right:95.65pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:120%">Washington, D.C. 20549</font></div><div style="margin-top:0.5pt"><font><br></font></div><div style="padding-left:73.95pt;padding-right:73.95pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:14pt;font-weight:700;line-height:121%">FORM S-8 </font></div><div style="padding-left:73.95pt;padding-right:73.95pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:14pt;font-weight:700;line-height:120%">REGISTRATION STATEMENT</font></div><div style="padding-left:95.65pt;padding-right:95.65pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-style:italic;font-weight:700;line-height:111%">UNDER</font></div><div style="margin-top:0.6pt;padding-left:95.67pt;padding-right:95.67pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-style:italic;font-weight:700;line-height:120%">THE SECURITIES ACT OF 1933</font></div><div style="margin-top:0.05pt"><font><br></font></div><div style="padding-left:75.62pt;padding-right:75.62pt;text-align:center"><img alt="image_01a.jpg" src="image_01a.jpg" style="height:53px;margin-bottom:5pt;vertical-align:text-bottom;width:181px"></div><div style="margin-top:7.55pt;padding-left:94.7pt;padding-right:94.7pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:22pt;font-weight:700;line-height:120%">PROS HOLDINGS, INC.</font></div><div style="margin-top:2.4pt;padding-left:94.7pt;padding-right:94.7pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:120%">(Exact name of registrant as specified in its charter)</font></div><div style="padding-left:47.95pt;padding-right:47.95pt;text-align:center"><font><br></font></div><div style="text-align:center"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:70.862%"><tr><td style="width:1.0%"></td><td style="width:32.647%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:9.459%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:11.115%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:20.639%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:20.640%"></td><td style="width:0.1%"></td></tr><tr><td colspan="6" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">Delaware</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="6" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">76-0168604</font></td></tr><tr><td colspan="6" style="padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:120%">(State or other jurisdiction of incorporation or organization)</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="6" style="padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:120%">(I.R.S. Employer Identification No.)</font></td></tr><tr style="height:15pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td></tr><tr><td colspan="6" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">3200 Kirby Drive, Suite 600</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="6" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">77098</font></td></tr><tr><td colspan="6" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">Houston, Texas</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="6" style="padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:120%">(Zip Code)</font></td></tr><tr><td colspan="6" style="padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:120%">(Address of Principal Executive Offices)</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td></tr><tr style="height:15pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td></tr></table></div><div style="padding-left:47.95pt;padding-right:47.95pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">AMENDED AND RESTATED 2017 EQUITY INCENTIVE PLAN</font></div><div style="padding-left:47.95pt;padding-right:47.95pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">2013 EMPLOYEE STOCK OPTION PLAN</font></div><div style="margin-top:3.25pt;padding-left:94.7pt;padding-right:94.7pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:120%">(Full title of the plan)</font></div><div style="margin-top:12pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">Damian W. Olthoff</font></div><div style="text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">General Counsel and Secretary</font></div><div style="text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">PROS Holdings, Inc.</font></div><div style="text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">3200 Kirby Drive, Suite 600</font></div><div style="text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">Houston, Texas 77098</font></div><div style="text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">(713)&#160;335-5151</font></div><div style="text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:120%">(Name, address, including zip code, and telephone number, </font></div><div style="text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:120%">including area code, of agent for service)</font></div><div style="padding-left:47.95pt;padding-right:47.95pt;text-align:center"><font><br></font></div><div style="text-align:justify"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of &#8220;large accelerated filer,&#8221; &#8220;accelerated filer,&#8221; &#8220;smaller reporting company,&#8221; and &#8220;emerging growth company&#8221; in Rule 12b-2 of the Exchange Act.</font></div><div style="padding-left:2.92pt;padding-right:2.92pt;text-align:center"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:288.75pt"><tr><td style="width:1.0pt"></td><td style="width:108.25pt"></td><td style="width:1.0pt"></td><td style="width:1.0pt"></td><td style="width:15.25pt"></td><td style="width:1.0pt"></td><td style="width:1.0pt"></td><td style="width:9.25pt"></td><td style="width:1.0pt"></td><td style="width:1.0pt"></td><td style="width:121.75pt"></td><td style="width:1.0pt"></td><td style="width:1.0pt"></td><td style="width:24.25pt"></td><td style="width:1.0pt"></td></tr><tr style="height:15pt"><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:120%">Large accelerated filer</font></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:11pt;font-weight:400;line-height:120%">&#9746; </font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:right;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:120%">Accelerated filer</font></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:11pt;font-weight:400;line-height:120%">&#9744;</font></td></tr><tr style="height:15pt"><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:120%">Non-accelerated filer</font></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:11pt;font-weight:400;line-height:120%">&#9744;</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:right;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:120%">Smaller reporting company</font></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:11pt;font-weight:400;line-height:120%">&#9744;</font></td></tr><tr style="height:15pt"><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:9pt;font-weight:400;line-height:120%">Emerging growth company</font></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:11pt;font-weight:400;line-height:120%">&#9744;</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td></tr></table></div><div style="padding-right:5.85pt;text-align:justify"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act.  </font><font style="color:#000000;font-family:'Arial Unicode MS',sans-serif;font-size:11pt;font-weight:400;line-height:120%">&#9744;</font></div><div style="padding-left:108pt;padding-right:5.85pt;text-align:justify;text-indent:36pt"><font><br></font></div><div id="i0813f1822f074a21aa74286e31082142_4"></div><div style="padding-left:62.57pt;padding-right:62.57pt;text-align:center;text-indent:36pt"><font><br></font></div><div style="height:50.4pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div><font><br></font></div></div></div><hr style="page-break-after:always"><div style="min-height:50.4pt;width:100%"><div><font><br></font></div></div><div style="padding-left:62.57pt;padding-right:62.57pt;text-align:center"><font><br></font></div><div style="text-align:center"><table style="border-collapse:collapse;display:inline-table;vertical-align:top;width:93.750%"><tr><td style="width:0.1%"></td><td style="width:2.773%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:34.424%"></td><td style="width:0.1%"></td><td style="width:0.1%"></td><td style="width:0.425%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:13.453%"></td><td style="width:0.1%"></td><td style="width:0.1%"></td><td style="width:0.425%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:13.453%"></td><td style="width:0.1%"></td><td style="width:0.1%"></td><td style="width:0.425%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:15.175%"></td><td style="width:0.1%"></td><td style="width:0.1%"></td><td style="width:0.425%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:12.522%"></td><td style="width:0.1%"></td></tr><tr><td colspan="3" style="background-color:#dbdbdb;padding:0 1pt"></td><td colspan="27" style="background-color:#dbdbdb;padding:2px 1pt;text-align:center;vertical-align:middle"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:115%;text-decoration:underline">CALCULATION OF REGISTRATION FEE</font></td></tr><tr><td colspan="6" style="border-bottom:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:115%">Title of securities to be registered</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:115%">Amount to be registered (1)</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Proposed maximum offering price per share</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:115%">Proposed<br>maximum<br>aggregate<br>offering price</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:115%">Amount of<br>registration fee</font></td></tr><tr><td colspan="6" style="border-bottom:1pt solid #000;border-top:1pt solid #000;padding:2px 1pt;text-align:left;vertical-align:bottom"><div style="margin-bottom:12pt;text-align:justify"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Common Stock, par value $0.001 per share, reserved for issuance pursuant to the Amended and Restated 2017 Equity Incentive Plan</font></div></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:right;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">3,100,000</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:right;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$ 37.79 (2)</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:right;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$ 117,149,000 (2)</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:right;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$ 12,780.96</font></td></tr><tr><td colspan="6" style="border-top:1pt solid #000;padding:2px 1pt;text-align:justify;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:115%">Common Stock, par value $0.001 per share, reserved for issuance pursuant to the 2013 Employee Stock Purchase Plan</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:right;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">500,000</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:right;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$ 32.12 (3)</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:right;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$ 16,060,000 (3)</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:right;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">$ 1,752.15</font></td></tr><tr style="height:15pt"><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:justify;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:115%">(1)</font></td><td colspan="27" style="padding:2px 1pt;text-align:justify;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:115%">Represents shares of Common Stock (as defined below) of Registrant (as defined below). Pursuant to Rule 416(a) of the Securities Act of 1933, as amended (the &#8220;Securities Act&#8221;), this Registration Statement (as defined below) shall also cover any additional shares of Registrant&#8217;s Common Stock that become issuable by reason of any stock dividend, stock split, recapitalization or other similar transaction that results in an increase in the number of outstanding shares of Registrant&#8217;s Common Stock.</font></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:justify;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:115%">(2)</font></td><td colspan="27" style="padding:2px 1pt;text-align:justify;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:115%">Estimated in accordance with paragraphs (c) and (h) of Rule 457 under the Securities Act solely for the purpose of calculating the registration fee on the basis of $37.79, which represents the average of the high and low price per share of  Registrant&#8217;s Common Stock on May 12, 2021 as reported on the New York Stock Exchange (&#8220;NYSE&#8221;).</font></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:justify;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:115%">(3)</font></td><td colspan="27" style="padding:2px 1pt;text-align:justify;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:8pt;font-weight:400;line-height:115%">Estimated in accordance with paragraphs (c) and (h) of Rule 457 under the Securities Act solely for the purpose of calculating the registration fee on the basis of $32.12 per share (calculated by taking 85% of $37.79, which represents the average of the high and low price per share of  Registrant&#8217;s Common Stock on May 12, 2021 as reported on the NYSE). Pursuant to the 2013 ESPP (as defined below), the purchase price of the shares of Common Stock reserved for issuance thereunder will be equal to 85% of the fair market value of the Common Stock on the first day or the last day of the offering period, whichever is less.</font></td></tr></table></div><div><font><br></font></div><div><font><br></font></div><div><font><br></font></div><div><font><br></font></div><div style="height:50.4pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div><font><br></font></div></div></div><div id="i0813f1822f074a21aa74286e31082142_7"></div><hr style="page-break-after:always"><div style="min-height:50.4pt;width:100%"><div><font><br></font></div></div><div style="margin-top:2.1pt;padding-left:0.5pt;padding-right:0.5pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:120%">EXPLANATORY NOTE</font></div><div style="margin-top:0.3pt"><font><br></font></div><div style="padding-left:0.6pt;padding-right:5.85pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:121%">This Registration Statement on Form S-8 (this &#8220;</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-style:italic;font-weight:700;line-height:121%">Registration Statement&#8221;</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:121%">) is filed by PROS Holdings, Inc. (&#8220;</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-style:italic;font-weight:700;line-height:121%">Registrant</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:121%">&#8221;) to register additional shares of common stock of Registrant, par value $0.001 per share (&#8220;</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-style:italic;font-weight:700;line-height:121%">Common Stock</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:121%">&#8221;) issuable pursuant to the Amended and Restated 2017 Equity Incentive Plan, as amended (the &#8220;</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-style:italic;font-weight:700;line-height:121%">2017 Plan</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:121%">&#8221;), and the 2013 Employee Stock Purchase Plan, as amended (&#8220;</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-style:italic;font-weight:700;line-height:121%">2013 ESPP</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:121%">&#8221;), and consists of only those items required by General Instruction E to Form S-8. </font></div><div style="padding-right:5.85pt;text-align:justify"><font><br></font></div><div style="padding-left:0.6pt;padding-right:5.85pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">This Registration Statement registers 3,100,000 additional shares of Common Stock reserved for issuance under the 2017 Plan, which shares are in addition to the 2,500,000 shares of Common Stock previously registered pursuant to a Registration Statement on Form S-8 filed with the Securities and Exchange Commission (the &#8220;</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-style:italic;font-weight:700;line-height:120%">Commission</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">&#8221;) on July 7, 2017, and the 2,050,000 shares of Common Stock previously registered pursuant to a Registration Statement on Form S-8 filed with the Commission on May 20, 2019. The contents of the Registration Statements on Form S-8 previously filed with the Commission on </font><font style="color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline"><a href="https://www.sec.gov/Archives/edgar/data/1392972/000139297217000092/s-8.htm" style="color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline">July 7, 2017</a></font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%"> and on </font><font style="color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline"><a href="https://www.sec.gov/Archives/edgar/data/1392972/000139297219000104/s-8may2019.htm" style="color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline">May 20, 2019</a></font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%"> are hereby incorporated by reference pursuant to General Instruction E to Form S-8.</font></div><div style="padding-right:5.85pt;text-align:justify"><font><br></font></div><div style="padding-left:0.6pt;padding-right:5.85pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">In addition, this Registration Statement registers 500,000 additional shares of Common Stock reserved for issuance under the 2013 ESPP, which shares are in addition to the 500,000 shares of Common Stock previously registered pursuant to a Registration Statement on Form S-8 filed with the Commission on February 11, 2014. The contents of the Registration Statement on Form S-8 filed with the Commission on </font><font style="color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline"><a href="https://www.sec.gov/Archives/edgar/data/1392972/000139297214000018/s-810feb2014.htm" style="color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline">February 11, 2014</a></font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%"> are hereby incorporated by reference pursuant to General Instruction E to Form S-8. </font></div><div style="padding-right:5.85pt;text-align:justify"><font><br></font></div><div style="padding-left:0.6pt;padding-right:5.85pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">The additional 3,100,000 shares being registered under the 2017 Plan and the additional 500,000 shares being registered under the 2013 ESPP pursuant to this Registration Statement were approved at the Annual Meeting of Stockholders of Registrant held on May 12, 2021. After giving effect to this Registration Statement, an aggregate of 7,650,000 shares of Common Stock have been registered for issuance pursuant to the 2017 Plan and an aggregate of 1,000,000 shares of Common Stock have been registered for issuance pursuant to the 2013 ESPP.</font></div><div style="padding-right:5.85pt;text-align:justify"><font><br></font></div><div style="height:50.4pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div><font><br></font></div></div></div><hr style="page-break-after:always"><div style="min-height:50.4pt;width:100%"><div><font><br></font></div></div><div><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"></td><td style="width:29.207%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:10.759%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:29.207%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:10.759%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:14.568%"></td><td style="width:0.1%"></td></tr><tr style="height:5pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td></tr></table></div><div id="i0813f1822f074a21aa74286e31082142_236"></div><div style="padding-left:0.47pt;padding-right:0.47pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:120%">PART I</font></div><div style="margin-top:0.55pt"><font><br></font></div><div style="padding-left:0.47pt;padding-right:0.47pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:120%">Information Required in the Section 10(a) Prospectus</font></div><div style="margin-top:0.25pt"><font><br></font></div><div style="padding-left:5pt;padding-right:5.85pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:121%">The information specified in Item 1 and Item 2 of Part I of Form S-8 is omitted from this Registration Statement in accordance with the provisions of Rule 428 under the Securities Act and the introductory note to Part I of Form S-8. The documents containing the information specified in Part I of Form S-8 will be delivered to the participants in the equity benefit plans covered by this Registration Statement as specified by Rule 428(b)(1) under the Securities Act.</font></div><div style="padding-right:5.85pt;text-align:justify"><font><br></font></div><div id="i0813f1822f074a21aa74286e31082142_242"></div><div style="padding-left:0.45pt;padding-right:0.45pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:120%">PART II</font></div><div style="margin-top:0.55pt"><font><br></font></div><div style="padding-left:0.47pt;padding-right:0.47pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:120%">Information Required in the Registration Statement</font></div><div style="margin-top:0.25pt"><font><br></font></div><div style="padding-left:0.93pt;text-align:justify"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">Item 3. Incorporation of documents by reference</font></div><div style="padding-left:0.93pt"><font><br></font></div><div style="padding-left:0.93pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">Registrant hereby incorporates by reference into this Registration Statement the following documents previously filed with the Commission&#58;</font></div><div style="padding-left:0.93pt;text-align:justify"><font><br></font></div><div style="padding-left:72pt;text-align:justify;text-indent:-36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">a.&#160;&#160;&#160;&#160;Registrant&#8217;s Annual Report on Form 10&#8209;K for the fiscal year ended December 31, 2020 (the &#8220;</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-style:italic;font-weight:700;line-height:120%">Annual Report</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">&#8221;), filed with the Commission on February 12, 2021, including the description of Registrant&#8217;s Common Stock contained in Exhibit 4.6 thereto&#59;</font></div><div style="padding-left:72pt;text-align:justify;text-indent:-36pt"><font><br></font></div><div style="padding-left:72pt;text-align:justify;text-indent:-36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">b.&#160;&#160;&#160;&#160;all other reports filed pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended (the &#8220;</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-style:italic;font-weight:700;line-height:120%">Exchange Act</font><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">&#8221;) since the end of the fiscal year covered by the Annual Report&#59; and</font></div><div style="text-align:justify"><font><br></font></div><div style="padding-left:72pt;text-align:justify;text-indent:-36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">c.&#160;&#160;&#160;&#160;Registrant&#8217;s Registration Statement No. 001-33554 on Form 8-A filed with the Commission on June 21, 2007 pursuant to Section 12(b) of the Exchange Act, which describes the terms, rights and provisions applicable to Registrant&#8217;s outstanding Common Stock.</font></div><div style="padding-left:0.93pt;text-align:justify"><font><br></font></div><div style="padding-left:0.93pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">All reports and definitive proxy or information statements filed pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this Registration Statement and prior to the filing of a post-effective amendment which indicates that all securities offered hereby have been sold or which de-registers all securities then remaining unsold shall be deemed to be incorporated by reference into this Registration Statement and to be a part hereof from the date of filing of such documents. Under no circumstances will any information furnished under current items 2.02 or 7.01 of Form 8-K be deemed incorporated herein by reference unless such Form 8-K expressly provides to the contrary. Any statement contained in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for purposes of this Registration Statement to the extent that a statement contained in any subsequently filed document which also is deemed to be incorporated by reference herein modifies or supersedes such statement.</font></div><div style="text-align:justify"><font><br></font></div><div style="height:50.4pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div><font><br></font></div></div></div><hr style="page-break-after:always"><div style="min-height:50.4pt;width:100%"><div><font><br></font></div></div><div style="text-align:justify"><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:3pt;font-weight:400;line-height:120%">   </font></div><div id="i0813f1822f074a21aa74286e31082142_250"></div><div style="-sec-extract:summary;padding-left:0.93pt;text-align:justify"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">Item 8. Exhibits</font></div><div style="text-align:justify"><font><br></font></div><div style="padding-left:0.93pt;text-align:justify"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">The following exhibits are incorporated by reference herein.</font></div><div style="text-align:justify"><font><br></font></div><div style="padding-left:0.6pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:99.911%"><tr><td style="width:1.0%"></td><td style="width:11.822%"></td><td style="width:0.1%"></td><td style="width:0.1%"></td><td style="width:1.415%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:84.363%"></td><td style="width:0.1%"></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:right;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">Number</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">Exhibit</font></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:right;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">4.1</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><div style="text-align:justify"><font style="color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline"><a href="https://www.sec.gov/Archives/edgar/data/1392972/000104746907005018/a2178451zex-3_11.htm" style="-sec-extract:exhibit;color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline">Amended and Restated Certificate of Incorporation (incorporated by reference to Exhibit 3.1.1 of  Registrant&#8217;s Form S-1 Registration Statement (Registration No. 333-141884), declared effective by the Commission on June 27, 2007, as amended).</a></font></div></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:right;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">4.2</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><div style="text-align:justify"><font style="color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline"><a href="https://www.sec.gov/Archives/edgar/data/1392972/000139297220000081/exhibit32prosamendedan.htm" style="-sec-extract:exhibit;color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline">Amended and Restated Bylaws (incorporated by reference to Exhibit 3.2 of Registrant&#8217;s Form 8-K filed with the Commission on April 29, 2020).</a></font></div></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:right;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">4.3</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><div style="text-align:justify"><font style="color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline"><a href="https://www.sec.gov/Archives/edgar/data/1392972/000104746907004877/a2178311zex-4_1.htm" style="-sec-extract:exhibit;color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline">Specimen certificate for shares of Common Stock (incorporated by reference to Exhibit 4.1 of  Registrant&#8217;s Form S-1 Registration Statement (Registration No. 333-141884), declared effective by the Commission on June 27, 2007, as amended).</a></font></div></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:right;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">4.4</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><div style="text-align:justify"><font style="color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline"><a href="https://www.sec.gov/Archives/edgar/data/1392972/000110465907049138/a07-16986_18a12b.htm" style="-sec-extract:exhibit;color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline">Registration Statement No. 001-33554 on Form 8-A filed with the Commission on June 21, 2007, incorporated herein by reference pursuant to Item 3(c).</a></font></div></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:right;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">4.5</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><div style="text-align:justify"><font style="color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline"><a href="https://www.sec.gov/Archives/edgar/data/1392972/000139297219000079/def14aproxydocument2019.htm" style="-sec-extract:exhibit;color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline">Amended and Restated 2017 Equity Incentive Plan (filed as Appendix A to</a><a href="https://www.sec.gov/Archives/edgar/data/1392972/000139297219000079/def14aproxydocument2019.htm" style="-sec-extract:exhibit;color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline"> Registrant's Proxy Statement filed with the Commission on March 25, 2019).</a></font></div></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:right;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">4.6</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><div style="text-align:justify"><font style="color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline"><a href="https://www.sec.gov/Archives/edgar/data/1392972/000139297213000029/prosholdings-2013employees.htm" style="-sec-extract:exhibit;color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline">2013 Employee Stock Purchase Program (incorporated by reference to Exhibit 10.1 of</a><a href="https://www.sec.gov/Archives/edgar/data/1392972/000139297213000029/prosholdings-2013employees.htm" style="-sec-extract:exhibit;color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline"> Registrant&#8217;s Form 8-K filed with the Commission on June 7, 2013).</a></font></div></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:right;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">5.1*</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><div style="text-align:justify"><font style="color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline"><a href="ex51_dlaopinionmay2021tos-8.htm" style="-sec-extract:exhibit;color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline">Opinion and consent of DLA Piper LLP (US).</a></font></div></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:right;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">23.1*</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><div style="text-align:justify"><font style="color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline"><a href="pwcconsentforforms-8.htm" style="-sec-extract:exhibit;color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline">Consent of PricewaterhouseCoopers LLP, Independent Registered Public Accounting Firm.</a></font></div></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:right;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">23.2*</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><div style="text-align:justify"><font style="color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline"><a href="ex51_dlaopinionmay2021tos-8.htm" style="-sec-extract:exhibit;color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline">Consent of DLA Piper LLP (US) (included in Exhibit 5.1).</a></font></div></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:right;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">24.1*</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:top"><div style="text-align:justify"><font style="color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline"><a href="#i0813f1822f074a21aa74286e31082142_258" style="-sec-extract:exhibit;color:#0000ff;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%;text-decoration:underline">Power of Attorney (included as part of the signature pages to this Registration Statement).</a></font></div></td></tr><tr style="height:9pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td></tr><tr><td colspan="9" style="padding:2px 1pt;text-align:left;vertical-align:top"><div style="padding-left:30pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">*&#160;Filed herewith</font></div></td></tr></table></div><div style="padding-left:52.25pt"><font><br></font></div><div><font><br></font></div><div style="height:50.4pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div><font><br></font></div></div></div><hr style="page-break-after:always"><div style="min-height:50.4pt;width:100%"><div><font><br></font></div></div><div><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:3pt;font-weight:400;line-height:120%">   </font></div><div id="i0813f1822f074a21aa74286e31082142_10"></div><div style="margin-top:2.9pt;padding-left:0.47pt;padding-right:0.47pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:12pt;font-weight:700;line-height:120%">SIGNATURES</font></div><div style="margin-top:0.25pt"><font><br></font></div><div style="padding-left:0.6pt;padding-right:5.85pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:121%">Pursuant to the requirements of the Securities Act of 1933, as amended, Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas on this 13th day of May 2021.</font></div><div style="padding-right:5.85pt;text-align:justify"><font><br></font></div><div style="text-align:center"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:496.50pt"><tr><td style="width:1.0pt"></td><td style="width:142.00pt"></td><td style="width:1.0pt"></td><td style="width:1.0pt"></td><td style="width:142.00pt"></td><td style="width:1.0pt"></td><td style="width:1.0pt"></td><td style="width:21.25pt"></td><td style="width:1.0pt"></td><td style="width:1.0pt"></td><td style="width:183.25pt"></td><td style="width:1.0pt"></td></tr><tr style="height:14pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="6" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%">PROS HOLDINGS, INC.</font></td></tr><tr style="height:15pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td></tr><tr style="height:14pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">By&#58;</font></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">&#47;s&#47; Andres Reiner</font></td></tr><tr style="height:11pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">Andres Reiner</font></td></tr><tr style="height:11pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">President and Chief Executive Officer</font></td></tr></table></div><div style="margin-top:3.55pt;padding-left:0.6pt"><font><br></font></div><div><font><br></font></div><div style="height:50.4pt;position:relative;width:100%"><div style="bottom:0;position:absolute;width:100%"><div><font><br></font></div></div></div><hr style="page-break-after:always"><div style="min-height:50.4pt;width:100%"><div><font><br></font></div></div><div><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:6pt;font-weight:400;line-height:120%">  </font></div><div id="i0813f1822f074a21aa74286e31082142_258"></div><div style="padding-left:0.3pt;padding-right:0.3pt;text-align:center"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:700;line-height:120%"> POWER OF ATTORNEY</font></div><div style="text-align:justify"><font><br></font></div><div style="padding-left:0.6pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">KNOW 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style="padding-left:0.6pt;text-align:justify;text-indent:36pt"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:11pt;font-weight:400;line-height:120%">Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.</font></div><div><font style="color:#000000;font-family:'Calibri',sans-serif;font-size:9pt;font-weight:400;line-height:120%">&#160;</font></div><div><font><br></font></div><div><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"></td><td style="width:29.207%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:10.759%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:29.207%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:10.759%"></td><td style="width:0.1%"></td><td style="width:1.0%"></td><td style="width:14.568%"></td><td style="width:0.1%"></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Signatures</font></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">&#160;&#160;</font></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Title</font></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">&#160;&#160;</font></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Date</font></td></tr><tr style="height:3pt"><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"></td></tr><tr style="height:18pt"><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">&#47;s&#47; Andres Reiner</font></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New 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style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">&#47;s&#47; Stefan Schulz</font></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">&#160;&#160;</font></td><td colspan="3" rowspan="2" style="padding:2px 1pt;text-align:center;vertical-align:middle"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Executive Vice President and Chief Financial Officer <br>(Principal Financial Officer)</font></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">&#160;&#160;</font></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><font 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style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">&#160;&#160;</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">&#160;&#160;</font></td><td colspan="3" style="padding:0 1pt"></td></tr><tr style="height:3pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">&#47;s&#47; Carlos Dominguez</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:top"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Director</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">May 13, 2021</font></td></tr><tr><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><font style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Carlos Dominguez</font></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 1pt"></td></tr><tr style="height:3pt"><td colspan="3" style="padding:0 1pt"></td><td colspan="3" style="padding:0 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Document
As filed with the Securities and Exchange Commission on May 13, 2021
Registration No. 333-
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM S-8
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933
PROS HOLDINGS, INC.
(Exact name of registrant as specified in its charter)
Delaware
76-0168604
(State or other jurisdiction of incorporation or organization)
(I.R.S. Employer Identification No.)
3200 Kirby Drive, Suite 600
77098
Houston, Texas
(Zip Code)
(Address of Principal Executive Offices)
AMENDED AND RESTATED 2017 EQUITY INCENTIVE PLAN
2013 EMPLOYEE STOCK OPTION PLAN
(Full title of the plan)
Damian W. Olthoff
General Counsel and Secretary
PROS Holdings, Inc.
3200 Kirby Drive, Suite 600
Houston, Texas 77098
(713) 335-5151
(Name, address, including zip code, and telephone number,
including area code, of agent for service)
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.
Large accelerated filer
☒
Accelerated filer
☐
Non-accelerated filer
☐
Smaller reporting company
☐
Emerging growth company
☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act.
☐
CALCULATION OF REGISTRATION FEE
Title of securities to be registered
Amount to be registered (1)
Proposed maximum offering price per share
Proposed
maximum
aggregate
offering price
Amount of
registration fee
Common Stock, par value $0.001 per share, reserved for issuance pursuant to the Amended and Restated 2017 Equity Incentive Plan
3,100,000
$ 37.79 (2)
$ 117,149,000 (2)
$ 12,780.96
Common Stock, par value $0.001 per share, reserved for issuance pursuant to the 2013 Employee Stock Purchase Plan
500,000
$ 32.12 (3)
$ 16,060,000 (3)
$ 1,752.15
(1)
Represents shares of Common Stock (as defined below) of Registrant (as defined below). Pursuant to Rule 416(a) of the Securities Act of 1933, as amended (the "Securities Act"), this Registration Statement (as defined below) shall also cover any additional shares of Registrant's Common Stock that become issuable by reason of any stock dividend, stock split, recapitalization or other similar transaction that results in an increase in the number of outstanding shares of Registrant's Common Stock.
(2)
Estimated in accordance with paragraphs (c) and (h) of Rule 457 under the Securities Act solely for the purpose of calculating the registration fee on the basis of $37.79, which represents the average of the high and low price per share of  Registrant's Common Stock on May 12, 2021 as reported on the New York Stock Exchange ("NYSE").
(3)
Estimated in accordance with paragraphs (c) and (h) of Rule 457 under the Securities Act solely for the purpose of calculating the registration fee on the basis of $32.12 per share (calculated by taking 85% of $37.79, which represents the average of the high and low price per share of  Registrant's Common Stock on May 12, 2021 as reported on the NYSE). Pursuant to the 2013 ESPP (as defined below), the purchase price of the shares of Common Stock reserved for issuance thereunder will be equal to 85% of the fair market value of the Common Stock on the first day or the last day of the offering period, whichever is less.
EXPLANATORY NOTE
This Registration Statement on Form S-8 (this "
Registration Statement"
) is filed by PROS Holdings, Inc. ("
Registrant
") to register additional shares of common stock of Registrant, par value $0.001 per share ("
Common Stock
") issuable pursuant to the Amended and Restated 2017 Equity Incentive Plan, as amended (the "
2017 Plan
"), and the 2013 Employee Stock Purchase Plan, as amended ("
2013 ESPP
"), and consists of only those items required by General Instruction E to Form S-8.
This Registration Statement registers 3,100,000 additional shares of Common Stock reserved for issuance under the 2017 Plan, which shares are in addition to the 2,500,000 shares of Common Stock previously registered pursuant to a Registration Statement on Form S-8 filed with the Securities and Exchange Commission (the "
Commission
") on July 7, 2017, and the 2,050,000 shares of Common Stock previously registered pursuant to a Registration Statement on Form S-8 filed with the Commission on May 20, 2019. The contents of the Registration Statements on Form S-8 previously filed with the Commission on
July 7, 2017
and on
May 20, 2019
are hereby incorporated by reference pursuant to General Instruction E to Form S-8.
In addition, this Registration Statement registers 500,000 additional shares of Common Stock reserved for issuance under the 2013 ESPP, which shares are in addition to the 500,000 shares of Common Stock previously registered pursuant to a Registration Statement on Form S-8 filed with the Commission on February 11, 2014. The contents of the Registration Statement on Form S-8 filed with the Commission on
February 11, 2014
are hereby incorporated by reference pursuant to General Instruction E to Form S-8.
The additional 3,100,000 shares being registered under the 2017 Plan and the additional 500,000 shares being registered under the 2013 ESPP pursuant to this Registration Statement were approved at the Annual Meeting of Stockholders of Registrant held on May 12, 2021. After giving effect to this Registration Statement, an aggregate of 7,650,000 shares of Common Stock have been registered for issuance pursuant to the 2017 Plan and an aggregate of 1,000,000 shares of Common Stock have been registered for issuance pursuant to the 2013 ESPP.
PART I
Information Required in the Section 10(a) Prospectus
The information specified in Item 1 and Item 2 of Part I of Form S-8 is omitted from this Registration Statement in accordance with the provisions of Rule 428 under the Securities Act and the introductory note to Part I of Form S-8. The documents containing the information specified in Part I of Form S-8 will be delivered to the participants in the equity benefit plans covered by this Registration Statement as specified by Rule 428(b)(1) under the Securities Act.
PART II
Information Required in the Registration Statement
Item 3. Incorporation of documents by reference
Registrant hereby incorporates by reference into this Registration Statement the following documents previously filed with the Commission:
a.    Registrant's Annual Report on Form 10‑K for the fiscal year ended December 31, 2020 (the "
Annual Report
"), filed with the Commission on February 12, 2021, including the description of Registrant's Common Stock contained in Exhibit 4.6 thereto;
b.    all other reports filed pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended (the "
Exchange Act
") since the end of the fiscal year covered by the Annual Report; and
c.    Registrant's Registration Statement No. 001-33554 on Form 8-A filed with the Commission on June 21, 2007 pursuant to Section 12(b) of the Exchange Act, which describes the terms, rights and provisions applicable to Registrant's outstanding Common Stock.
All reports and definitive proxy or information statements filed pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this Registration Statement and prior to the filing of a post-effective amendment which indicates that all securities offered hereby have been sold or which de-registers all securities then remaining unsold shall be deemed to be incorporated by reference into this Registration Statement and to be a part hereof from the date of filing of such documents. Under no circumstances will any information furnished under current items 2.02 or 7.01 of Form 8-K be deemed incorporated herein by reference unless such Form 8-K expressly provides to the contrary. Any statement contained in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for purposes of this Registration Statement to the extent that a statement contained in any subsequently filed document which also is deemed to be incorporated by reference herein modifies or supersedes such statement.
Item 8. Exhibits
The following exhibits are incorporated by reference herein.
Number
Exhibit
4.1
Amended and Restated Certificate of Incorporation (incorporated by reference to Exhibit 3.1.1 of  Registrant's Form S-1 Registration Statement (Registration No. 333-141884), declared effective by the Commission on June 27, 2007, as amended).
4.2
Amended and Restated Bylaws (incorporated by reference to Exhibit 3.2 of Registrant's Form 8-K filed with the Commission on April 29, 2020).
4.3
Specimen certificate for shares of Common Stock (incorporated by reference to Exhibit 4.1 of  Registrant's Form S-1 Registration Statement (Registration No. 333-141884), declared effective by the Commission on June 27, 2007, as amended).
4.4
Registration Statement No. 001-33554 on Form 8-A filed with the Commission on June 21, 2007, incorporated herein by reference pursuant to Item 3(c).
4.5
Amended and Restated 2017 Equity Incentive Plan (filed as Appendix A to
Registrant's Proxy Statement filed with the Commission on March 25, 2019).
4.6
2013 Employee Stock Purchase Program (incorporated by reference to Exhibit 10.1 of
Registrant's Form 8-K filed with the Commission on June 7, 2013).
5.1*
Opinion and consent of DLA Piper LLP (US).
23.1*
Consent of PricewaterhouseCoopers LLP, Independent Registered Public Accounting Firm.
23.2*
Consent of DLA Piper LLP (US) (included in Exhibit 5.1).
24.1*
Power of Attorney (included as part of the signature pages to this Registration Statement).
* Filed herewith
SIGNATURES
Pursuant to the requirements of the Securities Act of 1933, as amended, Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas on this 13th day of May 2021.
PROS HOLDINGS, INC.
By:
/s/ Andres Reiner
Andres Reiner
President and Chief Executive Officer
POWER OF ATTORNEY
KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Andres Reiner and Stefan Schulz and each of them acting alone, as his true and lawful attorney-in-fact and agent with full power of substitution, for him in any and all capacities, to sign any and all amendments to this Registration Statement, and to file the same, with all exhibits thereto and other documents in connection therewith, with the Commission, granting unto said attorney-in-fact, proxy and agent full power and authority to do and perform each and every act and thing requisite and necessary to be done in connection therewith, as fully for all intents and purposes as he might or could do in person, hereby ratifying and confirming all that said attorney-in-fact, proxy and agent, or his substitute, may lawfully do or cause to be done by virtue hereof.
Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.
Signatures
Title
Date
/s/ Andres Reiner
President, Chief Executive Officer and Director
(Principal Executive Officer)
May 13, 2021
Andres Reiner
/s/ Stefan Schulz
Executive Vice President and Chief Financial Officer
(Principal Financial Officer)
May 13, 2021
Stefan Schulz
/s/ Scott Cook
Senior Vice President and Chief Accounting Officer              (Principal Accounting Officer)
May 13, 2021
Scott Cook
/s/ William Russell
Chairman of the Board
May 13, 2021
William Russell
/s/ Carlos Dominguez
Director
May 13, 2021
Carlos Dominguez
/s/ Raja Hammoud
Director
May 13, 2021
Raja Hammoud
/s/ Catherine Lesjak
Director
May 13, 2021
Catherine Lesjak
/s/ Greg B. Petersen
Director
May 13, 2021
Greg B. Petersen
/s/ Timothy V. Williams
Director
May 13, 2021
Timothy V. Williams
/s/ Mariette M. Woestemeyer
Director
May 13, 2021
Mariette M. Woestemeyer