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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">UNITED STATES SECURITIES AND EXCHANGE COMMISSION</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Washington, D.C. 20549</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">FORM&nbsp;8-K</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">CURRENT REPORT PURSUANT TO SECTION&nbsp;13 OR 15(d)<br> OF THE SECURITIES EXCHANGE ACT OF 1934</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date of Report (Date of earliest event reported):<b>&#160; October&nbsp;15, 2013</b></font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">PLAINS GP HOLDINGS, L.P.</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Exact name of registrant as specified in its charter)</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Delaware</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(State or other jurisdiction</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">of incorporation or organization)</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">001-36132</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Commission</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">File Number)</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">90-1005472</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(IRS Employer</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Identification No.)</font></p>    </td>   </tr>  </table>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">333 Clay Street, Suite&nbsp;1600</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Houston, TX 77002</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">(713) 646-4100</font></b><b><font size="2" style="font-size:10.0pt;font-weight:bold;"><br>  </font></b><font size="2" style="font-size:10.0pt;">(Registrants&#146; telephone number, including area code)</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Check the appropriate box below if the Form&nbsp;8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;"> Written communications pursuant to Rule&nbsp;425 under the Securities Act (17 CFR 230.425)</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;"> Soliciting material pursuant to Rule&nbsp;14a-12 under the Exchange Act (17 CFR 240.14a-12)</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;"> Pre-commencement communications pursuant to Rule&nbsp;14d-2(b)&nbsp;under the Exchange Act (17 CFR 240.14d-2(b))</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;"> Pre-commencement communications pursuant to Rule&nbsp;13e-4(c)&nbsp;under the Exchange Act (17 CFR 240.13e-4(c))</font></p>
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<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 1.01&#160;&#160;&#160;&#160;&#160; Entry into a Material Definitive Agreement.</font></b></p>
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<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On October&nbsp;15, 2013, Plains GP Holdings, L.P. (the &#147;<b><i style="font-weight:bold;">Partnership</i></b>&#148;) and PAA GP Holdings LLC (the &#147;<b><i style="font-weight:bold;">General Partner</i></b>&#148;) entered into an Underwriting Agreement (the &#147;<b><i style="font-weight:bold;">Underwriting Agreement</i></b>&#148;) with Barclays Capital Inc., as representative of the several underwriters named therein (the &#147;<b><i style="font-weight:bold;">Underwriters</i></b>&#148;), with respect to the offering and sale of 128,000,000 Class&nbsp;A shares representing limited partner interests in the Partnership (the &#147;<b><i style="font-weight:bold;">Class&nbsp;A Shares</i></b>&#148;) to be sold by the Partnership at a price to the public of $22.00 per Class&nbsp;A Share ($21.34 per Class&nbsp;A Share, net of underwriting discounts).&#160; The Partnership also granted the Underwriters an option for a period of 30&nbsp;days to purchase up to an additional 19,200,000 Class&nbsp;A Shares from the Partnership. The material terms of the offering of the Class&nbsp;A Shares are described in the prospectus, dated October&nbsp;15, 2013, as filed by the Partnership with the Securities and Exchange Commission (the &#147;<b><i style="font-weight:bold;">Commission</i></b>&#148;) on October&nbsp;16, 2013. The offer and sale of the Class&nbsp;A Shares was registered with the Commission pursuant to a registration statement on Form&nbsp;S-1 (Registration No.&nbsp;333-190227), initially filed by the Partnership on July&nbsp;29, 2013, as amended. Closing with respect to the Class&nbsp;A Shares is expected to occur on October&nbsp;21, 2013, subject to the satisfaction of customary closing conditions.</font></p>
<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The Underwriting Agreement contains customary representations, warranties and agreements of the Partnership and certain affiliates, and customary conditions to closing, indemnification rights, obligations of the parties and termination provisions. Furthermore, the officers, directors and certain affiliates of the General Partner have agreed with the Underwriters not to offer or sell any Class&nbsp;A Shares (or securities convertible into or exchangeable for Class&nbsp;A Shares), subject to customary exceptions, for a period of 180&nbsp;days after the date of the Prospectus without the prior written consent of Barclays Capital Inc.</font></p>
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<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The foregoing description of the Underwriting Agreement is qualified in its entirety by reference to such Underwriting Agreement, a copy of which is filed herewith as Exhibit&nbsp;1.1 and is incorporated herein by reference.</font></p>
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<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 9.01&#160;&#160;&#160;&#160;&#160; Financial Statements and Exhibits.</font></b></p>
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<p style="margin:0in 0in .0001pt .25in;text-indent:.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)&#160;&#160; Exhibits</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1.1</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Underwriting   Agreement dated October&nbsp;15, 2013 by and among Plains GP Holdings, L.P.,   PAA GP Holdings LLC and Barclays Capital Inc., as representative of the   several underwriters named therein.</font></p>    </td>   </tr>  </table>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2<a name="PB_2_214843_7056"></a></font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">SIGNATURES</font></b></p>
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<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">PLAINS   GP HOLDINGS, L.P.</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:   PAA GP Holdings LLC, its general partner</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/   Richard McGee</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Name:</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Richard   McGee</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Executive   Vice President</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Dated:   October&nbsp;18, 2013</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3<a name="PB_3_215119_5335"></a></font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">EXHIBIT&nbsp;INDEX</font></b></p>
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<p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Exhibit&nbsp;No.</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Description</font></b></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1.1</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Underwriting   Agreement dated October&nbsp;15, 2013 by and among Plains GP Holdings, L.P.,   PAA GP Holdings LLC and Barclays Capital Inc., as representative of the   several underwriters named therein.</font></p>    </td>   </tr>  </table>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4<a name="PB_4_215145_5796"></a></font></p>
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{"company-data": {"conformed-name": "PLAINS GP HOLDINGS LP", "cik": "0001581990", "assigned-sic": "4610", "irs-number": "000000000", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-36132", "film-number": "131160216"}, "business-address": {"street1": "333 CLAY ST", "street2": "SUITE 1600", "city": "HOUSTON", "state": "TX", "zip": "77002", "phone": "713-646-4100"}, "mail-address": {"street1": "333 CLAY ST", "street2": "SUITE 1600", "city": "HOUSTON", "state": "TX", "zip": "77002"}}
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 8-K
CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934
Date of Report (Date of earliest event reported):
October 15, 2013
PLAINS GP HOLDINGS, L.P.
(Exact name of registrant as specified in its charter)
Delaware
(State or other jurisdiction
of incorporation or organization)
001-36132
(Commission
File Number)
90-1005472
(IRS Employer
Identification No.)
333 Clay Street, Suite 1600
Houston, TX 77002
(Address of principal executive office) (Zip Code)
(713) 646-4100
(Registrants' telephone number, including area code)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
o
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
o
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
o
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
o
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Item 1.01      Entry into a Material Definitive Agreement.
On October 15, 2013, Plains GP Holdings, L.P. (the "
Partnership
") and PAA GP Holdings LLC (the "
General Partner
") entered into an Underwriting Agreement (the "
Underwriting Agreement
") with Barclays Capital Inc., as representative of the several underwriters named therein (the "
Underwriters
"), with respect to the offering and sale of 128,000,000 Class A shares representing limited partner interests in the Partnership (the "
Class A Shares
") to be sold by the Partnership at a price to the public of $22.00 per Class A Share ($21.34 per Class A Share, net of underwriting discounts).  The Partnership also granted the Underwriters an option for a period of 30 days to purchase up to an additional 19,200,000 Class A Shares from the Partnership. The material terms of the offering of the Class A Shares are described in the prospectus, dated October 15, 2013, as filed by the Partnership with the Securities and Exchange Commission (the "
Commission
") on October 16, 2013. The offer and sale of the Class A Shares was registered with the Commission pursuant to a registration statement on Form S-1 (Registration No. 333-190227), initially filed by the Partnership on July 29, 2013, as amended. Closing with respect to the Class A Shares is expected to occur on October 21, 2013, subject to the satisfaction of customary closing conditions.
The Underwriting Agreement contains customary representations, warranties and agreements of the Partnership and certain affiliates, and customary conditions to closing, indemnification rights, obligations of the parties and termination provisions. Furthermore, the officers, directors and certain affiliates of the General Partner have agreed with the Underwriters not to offer or sell any Class A Shares (or securities convertible into or exchangeable for Class A Shares), subject to customary exceptions, for a period of 180 days after the date of the Prospectus without the prior written consent of Barclays Capital Inc.
The foregoing description of the Underwriting Agreement is qualified in its entirety by reference to such Underwriting Agreement, a copy of which is filed herewith as Exhibit 1.1 and is incorporated herein by reference.
Item 9.01      Financial Statements and Exhibits.
(d)   Exhibits
Exhibit No.
Description
1.1
Underwriting   Agreement dated October 15, 2013 by and among Plains GP Holdings, L.P.,   PAA GP Holdings LLC and Barclays Capital Inc., as representative of the   several underwriters named therein.
2
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.
PLAINS   GP HOLDINGS, L.P.
By:   PAA GP Holdings LLC, its general partner
By:
/s/   Richard McGee
Name:
Richard   McGee
Title:
Executive   Vice President
Dated:   October 18, 2013
3
EXHIBIT INDEX
Exhibit No.
Description
1.1
Underwriting   Agreement dated October 15, 2013 by and among Plains GP Holdings, L.P.,   PAA GP Holdings LLC and Barclays Capital Inc., as representative of the   several underwriters named therein.
4