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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</font></b></p>
<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;">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, DC 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 <br> Pursuant to Section&nbsp;13 or 15(d)&nbsp;of the</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;">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> July&nbsp;1, 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;">ARTHROCARE CORPORATION</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;">Delaware</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;">0-027422</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;">94-3180312</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<br> &nbsp;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;">(Commission   File Number)</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;">(I.R.S.   Employer Identification<br>   Number)</font></p>    </td>   </tr>  </table>
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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>
<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;">7000 West William Cannon, Building One</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;">Austin, TX&nbsp; 78735</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;">(Address of principal executive offices, including zip code)</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;">(512) 391-3900</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;">(Registrant&#146;s telephone number, including area code)</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>
<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;"> 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;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; Entry into a Material Definitive Agreement</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;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The information set forth under Item 2.01 of this Current Report on Form&nbsp;8-K 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 2.01.&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; Completion of Acquisition or Disposition of Assets.</font></b></p>
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<p style="margin:0in 0in .0001pt;text-indent:29.7pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On July&nbsp;1, 2013, ArthroCare Corporation (the &#147;<b><i style="font-weight:bold;">Company</i></b>&#148;) and a wholly-owned subsidiary of the Company (&#147;<b><i style="font-weight:bold;">Merger Sub</i></b>&#148;) entered into an Agreement and Plan of Merger (the &#147;<b><i style="font-weight:bold;">Agreement</i></b>&#148;) with ENTrigue Surgical,&nbsp;Inc., a privately held Delaware corporation (&#147;<b><i style="font-weight:bold;">ENTrigue</i></b>&#148;), and a representative of the securityholders of ENTrigue, pursuant to which Merger Sub merged with and into ENTrigue, with ENTrigue surviving as a wholly-owned subsidiary of the Company (the &#147;<b><i style="font-weight:bold;">Merger</i></b>&#148;).&#160; The closing of the Merger transaction coincided with the signing of the Agreement on July&nbsp;1, 2013 (the <b><i style="font-weight:bold;">&#147;Closing Date&#148;</i></b>).</font></p>
<p style="margin:0in 0in .0001pt;text-indent:29.7pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-indent:29.7pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the Agreement, the Company paid approximately $45 million in cash on the Closing Date to the former stockholders of ENTrigue (the &#147;<b><i style="font-weight:bold;">Former Stockholders</i></b>&#148;), less a customary working capital adjustment and an amount placed in escrow to secure the indemnification obligations of the Former Stockholders and former option holders (together the &#147;<b><i style="font-weight:bold;">Former Securityholders</i></b>&#148;).&nbsp; Each option to purchase shares of common stock of ENTrigue was fully accelerated and terminated pursuant to the Agreement.&#160; The&#160; Agreement also provides that the Former Securityholders will have the right to receive contingent consideration (the &#147;<b><i style="font-weight:bold;">Contingent Consideration</i></b>&#148;) in the future based on the net sales of certain products over the first five years ending on the anniversary of the Closing Date.&nbsp; Such Contingent Consideration is equal to a multiple of each year&#146;s annual growth of net sales of identified ENTrigue products cleared or in development as disclosed at the Closing Date (&#147;<b><i style="font-weight:bold;">ENTrigue Products</i></b>&#148;). The applicable sales growth multiple is 0.6 for each of the first three years following the Closing Date, 1.1 for the fourth year, and 1.25 for fifth year.&#160; The payment obligation with respect to such Contingent Consideration shall terminate on the fifth anniversary of the Closing Date.</font></p>
<p style="margin:0in 0in .0001pt;text-indent:29.7pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-indent:29.7pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The Agreement contains separate customary representations, warranties and covenants with respect to ENTrigue and the Company.&nbsp; The Agreement also provides for post-closing indemnification by the Former Securityholders for breaches of representations, warranties and covenants subject to certain limitations on damages.</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 8.01&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; Other Events</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;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">On July&nbsp;1, 2013, the Company entered into a Series&nbsp;C Share Purchase Agreement (the &#147;<b><i style="font-weight:bold;">Purchase Agreement</i></b>&#148;) with Ortho-Space Ltd., an Israeli limited company (&#147;<b><i style="font-weight:bold;">Ortho-Space</i></b>&#148;) pursuant to which the Company invested approximately $3.7 million in cash to acquire approximately 19.8% of the voting securities of Ortho-Space.&#160; The Company also has a right to invest an additional $0.8 million to purchase additional shares of Series&nbsp;C-1 Preferred Stock of Ortho-Space pursuant to the same terms and conditions under the Purchase Agreement.</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;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; Exhibits</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;">(d)&nbsp; Exhibits</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;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The following exhibits are attached hereto and furnished herewith.</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2.1</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;">Agreement   and Plan of Merger, by and among ArthroCare Corporation, Durante Merger   Sub,&nbsp;Inc., ENTrigue Surgical,&nbsp;Inc., and Shareholder Representative   Services, LLC as the Representative, dated as of July&nbsp;1, 2013</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;">Press   Release, dated July&nbsp;2, 2013.</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_004232_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:27.5pt;"><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 hereunto 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;">ARTHROCARE   CORPORATION</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;">Date:&nbsp;July&nbsp;2,   2013</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/   Todd Newton</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;">Todd   Newton</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;">Executive   Vice President, Chief Financial Officer&nbsp;&amp;<br>   Chief Operating 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;">3<a name="PB_3_004321_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;">2.1</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;">Agreement   and Plan of Merger, by and among ArthroCare Corporation, Durante Merger   Sub,&nbsp;Inc., ENTrigue Surgical,&nbsp;Inc., and Shareholder Representative   Services, LLC as the Representative, dated as of July&nbsp;1, 2013</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;">99.1</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;">Press   Release dated July&nbsp;2, 2013.</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_004347_5796"></a></font></p>
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{"company-data": {"conformed-name": "ARTHROCARE CORP", "cik": "0001005010", "assigned-sic": "3845", "irs-number": "943180312", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-34607", "film-number": "13946574"}, "business-address": {"street1": "7000 W. WILLIAM CANNON DRIVE", "city": "AUSTIN", "state": "TX", "zip": "78735", "phone": "(512) 391-3900"}, "mail-address": {"street1": "7000 W. WILLIAM CANNON DRIVE", "city": "AUSTIN", "state": "TX", "zip": "78735"}}
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 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):
July 1, 2013
ARTHROCARE CORPORATION
(Exact name of registrant as specified in charter)
Delaware
0-027422
94-3180312
(State   or Other Jurisdiction of
Incorporation)
(Commission   File Number)
(I.R.S.   Employer Identification
Number)
7000 West William Cannon, Building One
Austin, TX  78735
(Address of principal executive offices, including zip code)
(512) 391-3900
(Registrant's telephone number, including area code)
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 240.14a-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
The information set forth under Item 2.01 of this Current Report on Form 8-K is incorporated herein by reference.
Item 2.01.             Completion of Acquisition or Disposition of Assets.
On July 1, 2013, ArthroCare Corporation (the "
Company
") and a wholly-owned subsidiary of the Company ("
Merger Sub
") entered into an Agreement and Plan of Merger (the "
Agreement
") with ENTrigue Surgical, Inc., a privately held Delaware corporation ("
ENTrigue
"), and a representative of the securityholders of ENTrigue, pursuant to which Merger Sub merged with and into ENTrigue, with ENTrigue surviving as a wholly-owned subsidiary of the Company (the "
Merger
").  The closing of the Merger transaction coincided with the signing of the Agreement on July 1, 2013 (the
"Closing Date"
).
Pursuant to the Agreement, the Company paid approximately $45 million in cash on the Closing Date to the former stockholders of ENTrigue (the "
Former Stockholders
"), less a customary working capital adjustment and an amount placed in escrow to secure the indemnification obligations of the Former Stockholders and former option holders (together the "
Former Securityholders
").  Each option to purchase shares of common stock of ENTrigue was fully accelerated and terminated pursuant to the Agreement.  The  Agreement also provides that the Former Securityholders will have the right to receive contingent consideration (the "
Contingent Consideration
") in the future based on the net sales of certain products over the first five years ending on the anniversary of the Closing Date.  Such Contingent Consideration is equal to a multiple of each year's annual growth of net sales of identified ENTrigue products cleared or in development as disclosed at the Closing Date ("
ENTrigue Products
"). The applicable sales growth multiple is 0.6 for each of the first three years following the Closing Date, 1.1 for the fourth year, and 1.25 for fifth year.  The payment obligation with respect to such Contingent Consideration shall terminate on the fifth anniversary of the Closing Date.
The Agreement contains separate customary representations, warranties and covenants with respect to ENTrigue and the Company.  The Agreement also provides for post-closing indemnification by the Former Securityholders for breaches of representations, warranties and covenants subject to certain limitations on damages.
Item 8.01              Other Events
On July 1, 2013, the Company entered into a Series C Share Purchase Agreement (the "
Purchase Agreement
") with Ortho-Space Ltd., an Israeli limited company ("
Ortho-Space
") pursuant to which the Company invested approximately $3.7 million in cash to acquire approximately 19.8% of the voting securities of Ortho-Space.  The Company also has a right to invest an additional $0.8 million to purchase additional shares of Series C-1 Preferred Stock of Ortho-Space pursuant to the same terms and conditions under the Purchase Agreement.
Item 9.01              Exhibits
(d)  Exhibits
The following exhibits are attached hereto and furnished herewith.
Exhibit No.
Description
2.1
Agreement   and Plan of Merger, by and among ArthroCare Corporation, Durante Merger   Sub, Inc., ENTrigue Surgical, Inc., and Shareholder Representative   Services, LLC as the Representative, dated as of July 1, 2013
99.1
Press   Release, dated July 2, 2013.
2
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 hereunto duly authorized.
ARTHROCARE   CORPORATION
Date: July 2,   2013
By:
/s/   Todd Newton
Todd   Newton
Executive   Vice President, Chief Financial Officer &
Chief Operating Officer
3
Exhibit Index
Exhibit No.
Description
2.1
Agreement   and Plan of Merger, by and among ArthroCare Corporation, Durante Merger   Sub, Inc., ENTrigue Surgical, Inc., and Shareholder Representative   Services, LLC as the Representative, dated as of July 1, 2013
99.1
Press   Release dated July 2, 2013.
4