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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<br> 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</font></b></p>
<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;">Pursuant to Section&nbsp;13 OR 15(d)&nbsp;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> October&nbsp;10, 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;">OSIRIS THERAPEUTICS,&nbsp;INC.</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 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;">Maryland</font></b></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;">001-32966</font></b></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;">71-0881115</font></b></p>    </td>   </tr>
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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;">(State or other jurisdiction of</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;">(IRS Employer</font></p>    </td>   </tr>
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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;">incorporation)</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;">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;">7015 Albert Einstein Drive, Columbia, Maryland</font></b></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;">21046</font></b></p>    </td>   </tr>
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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;">Registrant&#146;s telephone number, including area code: <b>(443) 545 - 1800</b></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;">Not Applicable</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;">(Former name or former address, if changed since last report)</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" face="Wingdings" style="font-size:10.0pt;">&#160; </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" face="Wingdings" style="font-size:10.0pt;">&#160; </font><font size="2" style="font-size:10.0pt;">Soliciting material pursuant to Rule&nbsp;14a-12 under the Exchange Act (17 CFR 240.14d-2(b))</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" face="Wingdings" style="font-size:10.0pt;">&#160; </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>
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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" face="Wingdings" style="font-size:10.0pt;">&#160; </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 align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Entry into a Material Definitive Agreement</font></b></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Osiris Therapeutics,&nbsp;Inc. (the &#147;Company&#148;) and Mesoblast Limited (ASX:MSB; USOTC:MBLT), through its wholly owned subsidiary, Mesoblast International S&#225;rl (&#147;Mesoblast&#148;), entered into a Purchase Agreement, dated October&nbsp;10, 2013, pursuant to the terms of which the Company sold to Mesoblast the Company&#146;s culture expanded mesenchymal stem cell business, including Prochymal and other related assets. The Purchase Agreement provides for payment to the Company of $50 million in initial consideration, and payment of up to an additional $50 million upon the achievement by Mesoblast of certain clinical and regulatory milestones. Additionally, the Company will be entitled to earn low single to double digit cash royalties on future sales by Mesoblast of Prochymal and other products utilizing the acquired ceMSC technology.</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="Times New Roman" style="font-size:10.0pt;">Of the $50 million in initial consideration, $35 million is payable in cash, and the balance ($15 million) will be paid in a combination of cash and Mesoblast ordinary shares, at the discretion of Mesoblast, upon completed delivery of the ceMSC assets.&#160; Any payments made in Mesoblast ordinary shares will be subject to a one year holding period, but will be afforded downside protection for a drop in the Mesoblast share price over the holding period.</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="Times New Roman" style="font-size:10.0pt;">Also pursuant to the Purchase Agreement, the Company has retained a royalty free license to all transferred intellectual property, insofar as necessary to continue in its other businesses, including its Biosurgery business, but has also agreed not to compete with Mesoblast in the ceMSC business for a period of eight years. The Company expects to use the proceeds from this transaction to continue to pursue and expand its Biosurgery business.</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="Times New Roman" style="font-size:10.0pt;">The Purchase Agreement contains representations, warranties and other undertakings which the Company believes to be typical for transactions of this type.</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="Times New Roman" style="font-size:10.0pt;">A copy of the Company&#146;s Press Release dated October&nbsp;10, 2013, announcing the transaction is furnished as Exhibit&nbsp;99.1 hereto.</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="Times New Roman" style="font-size:10.0pt;">The above discussion is qualified in its entirety by the actual terms and provisions of the Purchase Agreement. The Press Release is also so qualified in its entirety.</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;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 2.01&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Completion of Acquisition or Disposition of Assets</font></b></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="Times New Roman" style="font-size:10.0pt;">On October&nbsp;10, 2013, the Company and Mesoblast Limited, through its wholly owned subsidiary, entered into the Purchase Agreement and a closing occurred. At the closing, the Company sold to Mesoblast the Company&#146;s culture expanded mesenchymal stem cell business, including Prochymal and other related assets. The company delivered a bill of sale and other conveyance instruments, and committed to the delivery in due course of various assets covered by the Purchase Agreement. The Purchase Agreement provides for payment to the Company of $50 million in initial consideration and payment of up to an additional $50 million upon the achievement by Mesoblast of certain clinical and regulatory milestones. Additionally, the Company will be entitled to earn low single to double digit cash royalties on future sales by Mesoblast of Prochymal and other products utilizing the acquired ceMSC technology.</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="Times New Roman" style="font-size:10.0pt;">Of the $50 million in initial consideration, $35 million is payable in cash, and the balance ($15 million) will be paid in a combination of cash and Mesoblast ordinary shares, at the discretion of Mesoblast, upon completed delivery of the ceMSC assets.&#160; Any payments made in Mesoblast ordinary shares will be subject to a one year holding period, but will be afforded downside protection for a drop in the Mesoblast share price over the holding period.</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="Times New Roman" style="font-size:10.0pt;">The above discussion is qualified in its entirety by the actual terms and provisions of the Purchase Agreement.</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;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Item 9.01&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Financial Statements and Exhibits</font></b></p>
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<td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.34%;">
<p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="92%" valign="top" style="padding:0in 0in 0in 0in;width:92.66%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">In   accordance with Item 9.01(b)(1)&nbsp;of Form&nbsp;8-K, the pro forma   financial information required by Item&nbsp;9.01(b)&nbsp;of Form&nbsp;8-K is   attached hereto as <u>Exhibit&nbsp;9.1</u> .</font></p>    </td>   </tr>
<tr>
<td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.34%;">
<p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="92%" valign="top" style="padding:0in 0in 0in 0in;width:92.66%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.34%;">
<p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)</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;">Exhibits.</font></p>    </td>   </tr>
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<td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.34%;">
<p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="92%" valign="top" style="padding:0in 0in 0in 0in;width:92.66%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
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<td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.34%;">
<p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="92%" valign="top" style="padding:0in 0in 0in 0in;width:92.66%;">
<p style="margin:0in 0in .0001pt .5in;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">9.1</font><font size="1" style="font-size:3.0pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </font><font size="2" style="font-size:10.0pt;">Unaudited pro   forma financial statements of the Company for the six months ended   June&nbsp;30, 2013 and the year ended December&nbsp;31, 2012.</font></p>    </td>   </tr>
<tr>
<td width="7%" valign="top" style="padding:0in 0in 0in 0in;width:7.34%;">
<p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="92%" valign="top" style="padding:0in 0in 0in 0in;width:92.66%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="92%" valign="top" style="padding:0in 0in 0in 0in;width:92.66%;">
<p style="margin:0in 0in .0001pt .5in;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">99.1</font><font size="1" style="font-size:3.0pt;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </font><font size="2" style="font-size:10.0pt;">Press Release   of the Company, dated October&nbsp;11, 2013.</font></p>    </td>   </tr>  </table>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</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;">2<a name="PB_2_010059_141"></a></font></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;">&nbsp;</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;">EXHIBIT&nbsp;INDEX</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;">&nbsp;</font></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>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.14%;">
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
<td width="86%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:86.76%;">
<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;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.14%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="86%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:86.76%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
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<td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.1%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">9.1</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.14%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.76%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Unaudited   pro forma financial statements of the Company for the six months ended   June&nbsp;30, 2013 and the year ended December&nbsp;31, 2012.</font></p>    </td>   </tr>
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<td width="11%" valign="top" style="padding:0in 0in 0in 0in;width:11.1%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">99.1</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.14%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="86%" valign="top" style="padding:0in 0in 0in 0in;width:86.76%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Press   release dated October&nbsp;10, 2013</font></p>    </td>   </tr>  </table>
<p style="margin:0in 0in .0001pt 1.0in;text-indent:-1.0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><i><font size="2" face="Times New Roman" style="font-size:10.0pt;font-style:italic;">Information presented in this Current Report on Form&nbsp;8-K may contain forward-looking statements and certain assumptions upon which such forward-looking statements are in part based. Forward-looking statements are subject to known and unknown risks and uncertainties and are based on potentially inaccurate assumptions that could cause actual results to differ materially from those expected or implied by the forward-looking statements. Risks and uncertainties related to the sale of our ceMSC assets and related transactions include typical business transactional risks, the risk of&nbsp;changing relationships with customers, suppliers or employees, the risk associated with the disposition of our ceMSC assets and the increased relative dependence on and importance of our other business including our biosurgery business, the risk that we may not be able to fully benefit from the described transaction through milestone payments or royalties, payment risks, including the risk associated with receipt of equity as consideration, in lieu of cash, and the risk of dependence on others to achieve results upon which milestone or royalty payments to us are conditioned.&#160;&#160; Additional factors that could cause our actual results to differ materially from those anticipated in forward-looking statements, include the factors described in the sections entitled &#147;Risk Factors&#148; in our most recent Annual Report on Form&nbsp;10-K and subsequent reports filed with the United States Securities and Exchange Commission. You should not unduly rely on forward-looking statements.</font></i></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</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;">3<a name="PB_3_010142_7608"></a></font></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;">SIGNATURES</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;">&nbsp;</font></p>
<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, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
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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;">OSIRIS   THERAPEUTICS,&nbsp;INC.</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>   </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;10, 2013</font></p>    </td>
<td width="5%" valign="top" style="padding:0in 0in 0in 0in;width:5.16%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By:</font></p>    </td>
<td width="44%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:44.84%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/   PHILIP R. JACOBY, JR.</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>
<td width="5%" valign="top" style="padding:0in 0in 0in 0in;width:5.16%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="44%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:44.84%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Philip   R. Jacoby,&nbsp;Jr.</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: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;">Chief   Financial Officer</font></p>    </td>   </tr>  </table>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</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;">4<a name="PB_4_010258_8146"></a></font></p>
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{"company-data": {"conformed-name": "OSIRIS THERAPEUTICS, INC.", "cik": "0001360886", "assigned-sic": "2836", "irs-number": "710881115", "state-of-incorporation": "MD", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-32966", "film-number": "131146789"}, "business-address": {"street1": "7015 ALBERT EINSTEIN DRIVE", "city": "COLUMBIA", "state": "MD", "zip": "21046", "phone": "443-545-1819"}, "mail-address": {"street1": "7015 ALBERT EINSTEIN DRIVE", "city": "COLUMBIA", "state": "MD", "zip": "21046"}}
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 10, 2013
OSIRIS THERAPEUTICS, INC.
(Exact Name of Registrant as Specified in Charter)
Maryland
001-32966
71-0881115
(State or other jurisdiction of
(Commission File Number)
(IRS Employer
incorporation)
Identification No.)
7015 Albert Einstein Drive, Columbia, Maryland
21046
(Address of principal executive offices)
(Zip Code)
Registrant's telephone number, including area code:
(443) 545 - 1800
Not Applicable
(Former name or former address, if changed since last report)
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 240.14d-2(b))
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
Osiris Therapeutics, Inc. (the "Company") and Mesoblast Limited (ASX:MSB; USOTC:MBLT), through its wholly owned subsidiary, Mesoblast International Sárl ("Mesoblast"), entered into a Purchase Agreement, dated October 10, 2013, pursuant to the terms of which the Company sold to Mesoblast the Company's culture expanded mesenchymal stem cell business, including Prochymal and other related assets. The Purchase Agreement provides for payment to the Company of $50 million in initial consideration, and payment of up to an additional $50 million upon the achievement by Mesoblast of certain clinical and regulatory milestones. Additionally, the Company will be entitled to earn low single to double digit cash royalties on future sales by Mesoblast of Prochymal and other products utilizing the acquired ceMSC technology.
Of the $50 million in initial consideration, $35 million is payable in cash, and the balance ($15 million) will be paid in a combination of cash and Mesoblast ordinary shares, at the discretion of Mesoblast, upon completed delivery of the ceMSC assets.  Any payments made in Mesoblast ordinary shares will be subject to a one year holding period, but will be afforded downside protection for a drop in the Mesoblast share price over the holding period.
Also pursuant to the Purchase Agreement, the Company has retained a royalty free license to all transferred intellectual property, insofar as necessary to continue in its other businesses, including its Biosurgery business, but has also agreed not to compete with Mesoblast in the ceMSC business for a period of eight years. The Company expects to use the proceeds from this transaction to continue to pursue and expand its Biosurgery business.
The Purchase Agreement contains representations, warranties and other undertakings which the Company believes to be typical for transactions of this type.
A copy of the Company's Press Release dated October 10, 2013, announcing the transaction is furnished as Exhibit 99.1 hereto.
The above discussion is qualified in its entirety by the actual terms and provisions of the Purchase Agreement. The Press Release is also so qualified in its entirety.
Item 2.01        Completion of Acquisition or Disposition of Assets
On October 10, 2013, the Company and Mesoblast Limited, through its wholly owned subsidiary, entered into the Purchase Agreement and a closing occurred. At the closing, the Company sold to Mesoblast the Company's culture expanded mesenchymal stem cell business, including Prochymal and other related assets. The company delivered a bill of sale and other conveyance instruments, and committed to the delivery in due course of various assets covered by the Purchase Agreement. The Purchase Agreement provides for payment to the Company of $50 million in initial consideration and payment of up to an additional $50 million upon the achievement by Mesoblast of certain clinical and regulatory milestones. Additionally, the Company will be entitled to earn low single to double digit cash royalties on future sales by Mesoblast of Prochymal and other products utilizing the acquired ceMSC technology.
Of the $50 million in initial consideration, $35 million is payable in cash, and the balance ($15 million) will be paid in a combination of cash and Mesoblast ordinary shares, at the discretion of Mesoblast, upon completed delivery of the ceMSC assets.  Any payments made in Mesoblast ordinary shares will be subject to a one year holding period, but will be afforded downside protection for a drop in the Mesoblast share price over the holding period.
The above discussion is qualified in its entirety by the actual terms and provisions of the Purchase Agreement.
Item 9.01        Financial Statements and Exhibits
(a)
Financial   Statements of Business Acquired
None
(b)
Pro   forma financial information.
In   accordance with Item 9.01(b)(1) of Form 8-K, the pro forma   financial information required by Item 9.01(b) of Form 8-K is   attached hereto as
Exhibit 9.1
.
(d)
Exhibits.
9.1
Unaudited pro   forma financial statements of the Company for the six months ended   June 30, 2013 and the year ended December 31, 2012.
99.1
Press Release   of the Company, dated October 11, 2013.
2
EXHIBIT INDEX
Exhibit No.
Description
9.1
Unaudited   pro forma financial statements of the Company for the six months ended   June 30, 2013 and the year ended December 31, 2012.
99.1
Press   release dated October 10, 2013
Information presented in this Current Report on Form 8-K may contain forward-looking statements and certain assumptions upon which such forward-looking statements are in part based. Forward-looking statements are subject to known and unknown risks and uncertainties and are based on potentially inaccurate assumptions that could cause actual results to differ materially from those expected or implied by the forward-looking statements. Risks and uncertainties related to the sale of our ceMSC assets and related transactions include typical business transactional risks, the risk of changing relationships with customers, suppliers or employees, the risk associated with the disposition of our ceMSC assets and the increased relative dependence on and importance of our other business including our biosurgery business, the risk that we may not be able to fully benefit from the described transaction through milestone payments or royalties, payment risks, including the risk associated with receipt of equity as consideration, in lieu of cash, and the risk of dependence on others to achieve results upon which milestone or royalty payments to us are conditioned.   Additional factors that could cause our actual results to differ materially from those anticipated in forward-looking statements, include the factors described in the sections entitled "Risk Factors" in our most recent Annual Report on Form 10-K and subsequent reports filed with the United States Securities and Exchange Commission. You should not unduly rely on forward-looking statements.
3
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.
OSIRIS   THERAPEUTICS, INC.
Dated:   October 10, 2013
By:
/s/   PHILIP R. JACOBY, JR.
Philip   R. Jacoby, Jr.
Chief   Financial Officer
4