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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, 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)</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;">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> May&nbsp;23, 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;">ONYX PHARMACEUTICALS,&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 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>    </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;">0-28298</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;">94-3154463</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 of 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 No.)</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 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;">249 East Grand Avenue</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;">&#160;South San Francisco California, 94080</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 and zip code)</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;">Registrant&#146;s telephone number, including area code:<b> (650)&nbsp;266-0000</b></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 (see General Instruction A.2. below):</font></p>
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<p style="margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#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 .25in;text-indent:-.25in;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Soliciting material pursuant to Rule&nbsp;14a-12 under the Exchange Act (17 CFR 240.14a-12)</font></p>
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<p style="margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#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>
<p style="margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#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;"><b><u><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">TABLE OF CONTENTS</font></u></b><a name="TableOfContents"></a></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;"><a href="#Item5_02_235759" title="Click to goto ">ITEM   5.02 DEPARTURE OF DIRECTORS OR CERTAIN OFFICERS; ELECTION OF DIRECTORS;   APPOINTMENT OF CERTAIN OFFICERS; COMPENSATORY ARRANGEMENTS OF CERTAIN   OFFICERS</a></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;"><a href="#Item5_07_235803" title="Click to goto ">ITEM   5.07 SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS</a></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;"><a href="#Item9_01_235805" title="Click to goto ">ITEM   9.01 FINANCIAL STATEMENTS AND EXHIBITS</a></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;"><a href="#Signatures_235813" title="Click to goto ">SIGNATURES</a></font></p>    </td>   </tr>
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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 5.02<a name="Item5_02_235759"></a></font></b></p>    </td>
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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;">DEPARTURE OF DIRECTORS OR CERTAIN   OFFICERS; ELECTION OF DIRECTORS; APPOINTMENT OF CERTAIN OFFICERS;   COMPENSATORY ARRANGEMENTS OF CERTAIN OFFICERS.</font></b></p>    </td>   </tr>  </table>
<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;"><i><font size="2" face="Times New Roman" style="font-size:10.0pt;font-style:italic;">Amendment to 2005 Equity Incentive Plan</font></i></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;">At the 2013 Annual Meeting of Stockholders of Onyx Pharmaceuticals,&nbsp;Inc., or the Company, held on May&nbsp;23, 2013, the Company&#146;s stockholders approved amendments to the Company&#146;s 2005 Equity Incentive Plan, or the Equity Incentive Plan, that effected the following changes:</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 .5in;text-indent:-.25in;"><font size="2" face="Symbol" style="font-size:10.0pt;">&#183;</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Added an additional 3,800,000 shares to the number of shares of Company common stock authorized for issuance under the Equity Incentive Plan;</font></p>
<p style="margin:0in 0in .0001pt .5in;text-indent:-.25in;"><font size="2" face="Symbol" style="font-size:10.0pt;">&#183;</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Increased the aggregate maximum number of shares of the Company&#146;s common stock that may be issued pursuant to the exercise of incentive stock options to 23,060,045 shares;</font></p>
<p style="margin:0in 0in .0001pt .5in;text-indent:-.25in;"><font size="2" face="Symbol" style="font-size:10.0pt;">&#183;</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Amended the menu of performance-based compensation criteria to be used under the Equity Incentive Plan as required by Section&nbsp;162(m)&nbsp;of the U.S. Internal Revenue Code by providing examples of the types of projects or processes that might be considered under criteria (xxvii)&nbsp;of the Equity Incentive Plan and by clarifying that criteria (xxxi), &#147;other measures selected by the Board,&#148; will not be used as a goal for any compensation that is intended to qualify as performance-based under Section&nbsp;162(m);</font></p>
<p style="margin:0in 0in .0001pt .5in;text-indent:-.25in;"><font size="2" face="Symbol" style="font-size:10.0pt;">&#183;</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Provided that future performance cash awards will be granted under the Company&#146;s new Cash Incentive Plan;</font></p>
<p style="margin:0in 0in .0001pt .5in;text-indent:-.25in;"><font size="2" face="Symbol" style="font-size:10.0pt;">&#183;</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Terminated provisions relating to Director non-discretionary grants; and</font></p>
<p style="margin:0in 0in .0001pt .5in;text-indent:-.25in;"><font size="2" face="Symbol" style="font-size:10.0pt;">&#183;</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Extended the term of the Equity Incentive Plan by an additional five years.</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">A more detailed summary of the material features of the Equity Incentive Plan is set forth in the Company&#146;s definitive Proxy Statement for the Annual Meeting, filed with the Securities and Exchange Commission on April&nbsp;9, 2013 under &#147;Proposal 2.&#148; The foregoing summary does not purport to be complete and is qualified in its entirety by reference to the full text of the Equity Incentive Plan, as amended, which is attached hereto as Exhibit&nbsp;10.13(i)&nbsp;and incorporated herein by reference.</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;"><i><font size="2" face="Times New Roman" style="font-size:10.0pt;font-style:italic;">Adoption of 2013 Cash Performance Incentive Plan</font></i></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">At the Annual Meeting, the Company&#146;s stockholders also approved a new Onyx Pharmaceuticals,&nbsp;Inc. 2013 Cash Performance Incentive Plan, or the Cash Incentive Plan.&#160; A summary description of the Cash Incentive Plan is included under &#147;Proposal 3&#148; of the Proxy Statement and is incorporated by reference herein.&#160; That summary does not purport to be complete and is qualified in its entirety by reference to the full text of the Cash Incentive Plan, which is attached hereto as Exhibit&nbsp;10.40 and incorporated by reference herein.</font></p>
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<p style="margin:0in 0in .0001pt;"><i><font size="2" face="Times New Roman" style="font-size:10.0pt;font-style:italic;">Amendment to 1996 Employee Stock Purchase Plan</font></i></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">At the Annual Meeting, the Company&#146;s stockholders also</font><font size="2" style="font-size:10.0pt;"> approved an amendment to the Company&#146;s 1996 Employee Stock Purchase Plan, or the ESPP, to increase the aggregate number of shares of common stock authorized for issuance under the ESPP by 1,000,000 shares. A summary description of the ESPP is included under &#147;Proposal 4&#148; of the Proxy Statement and is incorporated by reference herein. That summary does not purport to be complete and is qualified in its entirety by reference to the full text of the ESPP, as amended, which is attached hereto as Exhibit&nbsp;10.7 and incorporated by reference herein.</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;">SUBMISSION OF MATTERS TO A VOTE OF   SECURITY HOLDERS.</font></b></p>    </td>   </tr>  </table>
<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">&nbsp;</font></b></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">At the Annual Meeting, the Company&#146;s stockholders approved the six proposals listed below. Each proposal is described in detail in the Proxy Statement. The results of the matters voted upon at the meeting were:</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:10.0pt;">(1)</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;">All of the nominees of the Board of Directors were   elected to serve until the Company&#146;s 2016 annual meeting of stockholders. The   nominees were: Corinne H. Nevinny; 60,575,006 shares of common stock voted   for, none against, 447,828 withheld, and 5,419,654 broker non-votes; and   Thomas G. Wiggans; 59,664,805 shares of common stock voted for, none against,   1,358,029 withheld, and 5,419,654 broker non-votes.</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 term of office of directors N. Anthony Coles,   M.D., Magnus Lundberg and William R. Ringo continues until the Company&#146;s   annual stockholders&#146; meeting in 2014.&nbsp;   The term of office of directors Paul   Goddard, Ph.D., Antonio J.   Grillo-L&#243;pez, M.D. and Wendell   Wierenga, Ph.D. continues until the Company&#146;s annual stockholders&#146;   meeting in 2015.</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>
<td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.18%;">
<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;">(2)</font></p>    </td>
<td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.18%;">
<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;">The stockholders approved the Equity Incentive Plan,   as amended, to, among other things, increase the aggregate number of shares   of common stock authorized for issuance under the Equity Incentive Plan by   3,800,000 shares: 41,675,748 shares of common stock voted for, 19,287,731   against, 59,355 abstaining, and 5,419,654 broker non-votes.</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_235500_5796"></a></font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;"><a href="#TableOfContents" title="Click to go to Table of Contents">Table of Contents</a></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;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(3)</font></p>    </td>
<td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.18%;">
<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;">The stockholders approved the Cash Incentive Plan:   59,998,207 shares of common stock voted for, 965,258 against, 59,369   abstaining, and 5,419,654 broker non-votes.</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>
<td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.18%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="94%" valign="top" style="padding:0in 0in 0in 0in;width:94.88%;">
<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="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.94%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(4)</font></p>    </td>
<td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.18%;">
<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;">The stockholders approved the ESPP, as amended, to   increase the aggregate number of shares of common stock authorized for   issuance under the ESPP by 1,000,000 shares: 60,618,398 shares of common   stock voted for, 151,410 against, 253,026 abstaining, and 5,419,654 broker   non-votes.</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>
<td width="2%" valign="top" style="padding:0in 0in 0in 0in;width:2.18%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="94%" valign="top" style="padding:0in 0in 0in 0in;width:94.88%;">
<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;">(5)</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;">The stockholders approved, on an advisory basis, the   2012 compensation of the Company&#146;s named executive officers as disclosed in   the Proxy Statement: 58,984,585 shares of common stock voted for, 1,976,662   against, 61,587 abstaining, and 5,419,654 broker non-votes.</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;">&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;">(6)</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;">The stockholders ratified the selection by the Audit   Committee of the Board of Directors of Ernst&nbsp;&amp;Young LLP as the   Company&#146;s independent registered public accounting firm for the fiscal year   ending December&nbsp;31, 2013: 61,881,568 shares of common stock voted for,   4,492,432 against, 68,488 abstaining and zero broker non-votes.</font></p>    </td>   </tr>  </table>
<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;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">ITEM 9.01<a name="Item9_01_235805"></a></font></b></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;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">FINANCIAL STATEMENTS AND EXHIBITS.</font></b></p>    </td>   </tr>  </table>
<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;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Exhibit&nbsp;Number</font></b></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.0%;">
<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>
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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;">10.7</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;">1996 Employee Stock Purchase Plan, as amended</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;">10.13(i)</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;">2005 Equity Incentive Plan, as amended</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;">10.40</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;">2013 Cash Performance Incentive Plan</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_235615_2897"></a></font></p>
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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;">SIGNATURES</font></b><a name="Signatures_235813"></a></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:30.0pt;"><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 hereunto duly authorized.</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;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Date: May&nbsp;23, 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;">ONYX PHARMACEUTICALS,&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: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;">By:</font></p>    </td>
<td width="45%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:45.42%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/ Matthew K. Fust</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;">Matthew K. Fust</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>
<td width="45%" valign="top" style="padding:0in 0in 0in 0in;width:45.42%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Executive Vice President and 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;">5<a name="PB_5_235711_3020"></a></font></p>
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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;">INDEX TO EXHIBITS</font></b><a name="IndexToExhibits_235816"></a></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;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Exhibit&nbsp;Number</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:1.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
<td width="85%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:85.0%;">
<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;">10.7</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>
<td width="85%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:85.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1996 Employee Stock Purchase Plan, as amended</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;">10.13(i)</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>
<td width="85%" valign="top" style="padding:0in 0in 0in 0in;width:85.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2005 Equity Incentive Plan, as amended</font></p>    </td>   </tr>
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<td width="13%" valign="top" style="padding:0in 0in 0in 0in;width:13.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">10.40</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;">2013 Cash Performance Incentive Plan</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;">6<a name="PB_6_235744_7748"></a></font></p>
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Table of Contents
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):
May 23, 2013
ONYX PHARMACEUTICALS, INC.
(Exact name of registrant as specified in its charter)
DELAWARE
0-28298
94-3154463
(State of incorporation)
(Commission File No.)
(IRS Employer Identification No.)
249 East Grand Avenue
South San Francisco California, 94080
(Address of principal executive offices and zip code)
Registrant's telephone number, including area code:
(650) 266-0000
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 (see General Instruction A.2. below):
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))
Table of Contents
TABLE OF CONTENTS
ITEM   5.02 DEPARTURE OF DIRECTORS OR CERTAIN OFFICERS; ELECTION OF DIRECTORS;   APPOINTMENT OF CERTAIN OFFICERS; COMPENSATORY ARRANGEMENTS OF CERTAIN   OFFICERS
ITEM   5.07 SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
ITEM   9.01 FINANCIAL STATEMENTS AND EXHIBITS
SIGNATURES
INDEX TO EXHIBITS
2
Table of Contents
ITEM 5.02
DEPARTURE OF DIRECTORS OR CERTAIN   OFFICERS; ELECTION OF DIRECTORS; APPOINTMENT OF CERTAIN OFFICERS;   COMPENSATORY ARRANGEMENTS OF CERTAIN OFFICERS.
Amendment to 2005 Equity Incentive Plan
At the 2013 Annual Meeting of Stockholders of Onyx Pharmaceuticals, Inc., or the Company, held on May 23, 2013, the Company's stockholders approved amendments to the Company's 2005 Equity Incentive Plan, or the Equity Incentive Plan, that effected the following changes:
·
Added an additional 3,800,000 shares to the number of shares of Company common stock authorized for issuance under the Equity Incentive Plan;
·
Increased the aggregate maximum number of shares of the Company's common stock that may be issued pursuant to the exercise of incentive stock options to 23,060,045 shares;
·
Amended the menu of performance-based compensation criteria to be used under the Equity Incentive Plan as required by Section 162(m) of the U.S. Internal Revenue Code by providing examples of the types of projects or processes that might be considered under criteria (xxvii) of the Equity Incentive Plan and by clarifying that criteria (xxxi), "other measures selected by the Board," will not be used as a goal for any compensation that is intended to qualify as performance-based under Section 162(m);
·
Provided that future performance cash awards will be granted under the Company's new Cash Incentive Plan;
·
Terminated provisions relating to Director non-discretionary grants; and
·
Extended the term of the Equity Incentive Plan by an additional five years.
A more detailed summary of the material features of the Equity Incentive Plan is set forth in the Company's definitive Proxy Statement for the Annual Meeting, filed with the Securities and Exchange Commission on April 9, 2013 under "Proposal 2." The foregoing summary does not purport to be complete and is qualified in its entirety by reference to the full text of the Equity Incentive Plan, as amended, which is attached hereto as Exhibit 10.13(i) and incorporated herein by reference.
Adoption of 2013 Cash Performance Incentive Plan
At the Annual Meeting, the Company's stockholders also approved a new Onyx Pharmaceuticals, Inc. 2013 Cash Performance Incentive Plan, or the Cash Incentive Plan.  A summary description of the Cash Incentive Plan is included under "Proposal 3" of the Proxy Statement and is incorporated by reference herein.  That summary does not purport to be complete and is qualified in its entirety by reference to the full text of the Cash Incentive Plan, which is attached hereto as Exhibit 10.40 and incorporated by reference herein.
Amendment to 1996 Employee Stock Purchase Plan
At the Annual Meeting, the Company's stockholders also
approved an amendment to the Company's 1996 Employee Stock Purchase Plan, or the ESPP, to increase the aggregate number of shares of common stock authorized for issuance under the ESPP by 1,000,000 shares. A summary description of the ESPP is included under "Proposal 4" of the Proxy Statement and is incorporated by reference herein. That summary does not purport to be complete and is qualified in its entirety by reference to the full text of the ESPP, as amended, which is attached hereto as Exhibit 10.7 and incorporated by reference herein.
ITEM 5.07
SUBMISSION OF MATTERS TO A VOTE OF   SECURITY HOLDERS.
At the Annual Meeting, the Company's stockholders approved the six proposals listed below. Each proposal is described in detail in the Proxy Statement. The results of the matters voted upon at the meeting were:
(1)
All of the nominees of the Board of Directors were   elected to serve until the Company's 2016 annual meeting of stockholders. The   nominees were: Corinne H. Nevinny; 60,575,006 shares of common stock voted   for, none against, 447,828 withheld, and 5,419,654 broker non-votes; and   Thomas G. Wiggans; 59,664,805 shares of common stock voted for, none against,   1,358,029 withheld, and 5,419,654 broker non-votes.
The term of office of directors N. Anthony Coles,   M.D., Magnus Lundberg and William R. Ringo continues until the Company's   annual stockholders' meeting in 2014.    The term of office of directors Paul   Goddard, Ph.D., Antonio J.   Grillo-López, M.D. and Wendell   Wierenga, Ph.D. continues until the Company's annual stockholders'   meeting in 2015.
(2)
The stockholders approved the Equity Incentive Plan,   as amended, to, among other things, increase the aggregate number of shares   of common stock authorized for issuance under the Equity Incentive Plan by   3,800,000 shares: 41,675,748 shares of common stock voted for, 19,287,731   against, 59,355 abstaining, and 5,419,654 broker non-votes.
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(3)
The stockholders approved the Cash Incentive Plan:   59,998,207 shares of common stock voted for, 965,258 against, 59,369   abstaining, and 5,419,654 broker non-votes.
(4)
The stockholders approved the ESPP, as amended, to   increase the aggregate number of shares of common stock authorized for   issuance under the ESPP by 1,000,000 shares: 60,618,398 shares of common   stock voted for, 151,410 against, 253,026 abstaining, and 5,419,654 broker   non-votes.
(5)
The stockholders approved, on an advisory basis, the   2012 compensation of the Company's named executive officers as disclosed in   the Proxy Statement: 58,984,585 shares of common stock voted for, 1,976,662   against, 61,587 abstaining, and 5,419,654 broker non-votes.
(6)
The stockholders ratified the selection by the Audit   Committee of the Board of Directors of Ernst &Young LLP as the   Company's independent registered public accounting firm for the fiscal year   ending December 31, 2013: 61,881,568 shares of common stock voted for,   4,492,432 against, 68,488 abstaining and zero broker non-votes.
ITEM 9.01
FINANCIAL STATEMENTS AND EXHIBITS.
Exhibit Number
Description
10.7
1996 Employee Stock Purchase Plan, as amended
10.13(i)
2005 Equity Incentive Plan, as amended
10.40
2013 Cash Performance Incentive Plan
4
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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 hereunto duly authorized.
Date: May 23, 2013
ONYX PHARMACEUTICALS, INC.
By:
/s/ Matthew K. Fust
Matthew K. Fust
Executive Vice President and Chief Financial Officer
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INDEX TO EXHIBITS
Exhibit Number
Description
10.7
1996 Employee Stock Purchase Plan, as amended
10.13(i)
2005 Equity Incentive Plan, as amended
10.40
2013 Cash Performance Incentive Plan
6