<HTML><HEAD>
<TITLE>8-K</TITLE>
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 <P STYLE="line-height:1.0pt;margin-top:0pt;margin-bottom:0pt;border-bottom:1px solid #000000">&nbsp;</P>
<P STYLE="line-height:3.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1px solid #000000">&nbsp;</P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>UNITED STATES </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>SECURITIES AND EXCHANGE COMMISSION </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>WASHINGTON, DC 20549 </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>FORM 8-K
</B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center> <P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>CURRENT REPORT </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>Pursuant
to Section&nbsp;13 or 15(d) of the Securities Exchange Act of 1934 </B></P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Date of Report (Date of earliest event reported):
September&nbsp;24, 2013 </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center> <P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:24pt; font-family:Times New Roman" ALIGN="center"><B>ONYX PHARMACEUTICALS, INC. </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>(Exact Name of Registrant as Specified in its Charter) </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="top" ALIGN="center"><B>Delaware</B></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"><B>000-28298</B></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"><B>94-3154463</B></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:8pt">
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(State or other jurisdiction</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>of incorporation)</B></P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Commission</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>File Number)</B></P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(IRS Employer</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Identification No.)</B></P></TD></TR>
<TR>
<TD HEIGHT="16" COLSPAN="3"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>249 East Grand Avenue</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>South San Francisco, California</B></P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="bottom" ALIGN="center"><B>94080</B></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:8pt">
<TD VALIGN="top" COLSPAN="3" ALIGN="center"><B>(Address of principal executive offices)</B></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"><B>(Zip Code)</B></TD></TR>
</TABLE> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Registrant&#146;s telephone number, including area code: (650)&nbsp;266-0000 </B></P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Not Applicable </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Former
name or former address, if changed since last report.) </B></P> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">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: </P> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TR>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT></TD>
<TD ALIGN="left" VALIGN="top">Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TR>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT></TD>
<TD ALIGN="left" VALIGN="top">Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT></TD>
<TD ALIGN="left" VALIGN="top">Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT></TD>
<TD ALIGN="left" VALIGN="top">Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) </TD></TR></TABLE> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<P STYLE="line-height:1.0pt;margin-top:0pt;margin-bottom:0pt;border-bottom:1px solid #000000">&nbsp;</P> <P STYLE="line-height:3.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1px solid #000000">&nbsp;</P>

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<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">
 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>Item&nbsp;8.01 Other Events. </B></P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">On September&nbsp;24, 2013, Onyx Pharmaceuticals, Inc., a Delaware corporation (the &#147;<U>Company</U>&#148;) delivered a notice (the
&#147;<U>Notice</U>&#148;) to the Trustee (as defined below) and the holders of the Company&#146;s outstanding 4.00% Convertible Senior Notes due 2016 Notes of an anticipated Make-Whole Fundamental Change (as defined in the First Supplemental
Indenture, dated August&nbsp;12, 2009, by and between the Company and Wells Fargo Bank, National Association, as trustee (the &#147;<U>Trustee</U>&#148;)). A copy of the Notice is attached hereto as <U>Exhibit 99.1</U> and is incorporated into this
report by reference. </P> <P STYLE="margin-top:18pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>Additional Information about the Offer and the Merger and Where to Find It </B></P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">This filing and the attached exhibit are neither an offer to buy nor a solicitation of an offer to sell any securities, including the Notes (as
defined in the Notice). Amgen Inc. and Arena Acquisition Company have filed a tender offer statement on Schedule TO with the Securities and Exchange Commission, and Onyx Pharmaceuticals, Inc. has filed a solicitation/recommendation statement on
Schedule 14D-9 with respect to the Offer (as defined in the Notice). Onyx Pharmaceuticals, Inc. stockholders and other investors should read the tender offer statement (including the offer to purchase, related letter of transmittal and other Offer
documents) and the solicitation/recommendation statement carefully because they contain important information, including the terms and conditions of the Offer. Onyx Pharmaceuticals, Inc. stockholders and other investors will be able to obtain copies
of these materials without charge from the SEC through the SEC&#146;s website at www.sec.gov, from Onyx Pharmaceuticals, Inc. (with respect to documents filed by Onyx Pharmaceuticals, Inc. with the SEC), or from Amgen Inc. (with respect to documents
filed by Amgen Inc. and Arena Acquisition Company). Stockholders and other investors are urged to read carefully those materials prior to making any decisions with respect to the Offer or the Notes. </P>
<P STYLE="margin-top:18pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>Forward-Looking Statements </B></P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Statements in
this Current Report on Form 8-K and the documents that the Company has filed with the SEC that are incorporated by reference in this Current Report on Form 8-K may contain, in addition to historical information, certain statements that are
&#147;forward-looking statements&#148; within the meaning of Section&nbsp;27A of the Securities Act of 1933, as amended, and Section&nbsp;21E of the Securities Exchange Act of 1934, as amended. The Company has identified some of these
forward-looking statements with words like &#147;believe,&#148; &#147;may,&#148; &#147;could,&#148; &#147;would,&#148; &#147;might,&#148; &#147;possible,&#148; &#147;will,&#148; &#147;should,&#148; &#147;expect,&#148; &#147;intend,&#148;
&#147;plan,&#148; &#147;anticipate,&#148; or &#147;continue,&#148; the negative of these words, other terms of similar meaning or the use of future dates. Forward-looking statements in this Current Report on Form 8-K and the documents that the
Company has filed with the SEC that are incorporated by reference in this Current Report on Form 8-K include without limitation statements regarding planned completion of the Offer and the Merger (as defined in the Notice). These statements are
subject to risks and uncertainties that could cause actual results and events to differ materially from those anticipated, including, but not limited to, risks and uncertainties related to: uncertainties as to the timing of the transaction;
uncertainties as to the percentage of Onyx stockholders tendering their shares in the offer; the possibility that competing offers will be made; the possibility that various closing conditions for the transaction may not be satisfied or waived,
including that a governmental entity may prohibit, delay or refuse to grant approval for the consummation of the transaction; the effects of disruption caused by the transaction making it more difficult to maintain relationships with employees,
collaborators, vendors and other business partners; the risk that stockholder litigation in connection with the transaction may result in significant costs of defense, indemnification and liability; Nexavar<SUP
STYLE="font-size:85%; vertical-align:top">&reg;</SUP> (sorafenib) tablets, Kyprolis<SUP STYLE="font-size:85%; vertical-align:top">&reg;</SUP> (carfilzomib) for Injection and Stivarga<SUP STYLE="font-size:85%; vertical-align:top">&reg;</SUP>
(regorafenib) tablets being the only approved products from which the Company may obtain revenue; competition; failures or delays in the Company&#146;s clinical trials or the regulatory process; dependence on the Company&#146;s collaborative
relationship with Bayer; supply of Nexavar, Stivarga or Kyprolis; market acceptance and the rate of adoption of Nexavar, Stivarga and Kyprolis; pharmaceutical pricing and reimbursement pressures; serious adverse side effects, if they are associated
with Nexavar, Stivarga or Kyprolis; government regulation; possible failure to realize the anticipated benefits of business acquisitions or strategic investments; protection of the Company&#146;s intellectual property; product liability risks; and
other risks and uncertainties discussed in the Company&#146;s filings with the SEC, including the &#147;Risk Factors&#148; sections of the Company&#146;s most recent annual report on Form 10-K and subsequent quarterly reports on Form 10-Q, as well
as the tender offer documents filed by Amgen Inc. and Arena Acquisition Company, and the Solicitation/Recommendation Statement filed by the Company. The Company undertakes no obligation to update any forward-looking statements as a result of new
information, future developments or otherwise, except as expressly required by law. All forward-looking statements in this Current Report on Form 8-K and the documents that the Company has filed with the SEC that are incorporated by reference in
this Current Report on Form 8-K are qualified in their entirety by this cautionary statement. </P>

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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>Item&nbsp;9.01 Financial Statements and Exhibits. </B></P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"><B>(d) Exhibits </B></P> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="top" NOWRAP>99.1</TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top">Notice of Anticipated Make-Whole Fundamental Change, dated as of September 24, 2013.</TD></TR>
</TABLE>

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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>SIGNATURES </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">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. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Dated as of September&nbsp;24, 2013 </P>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><DIV ALIGN="right">
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<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3"><B>ONYX PHARMACEUTICALS, INC.</B></TD></TR>
<TR>
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom" STYLE="BORDER-BOTTOM:1px solid #000000"><FONT STYLE="font-size:8pt">&nbsp;</FONT></TD>
<TD VALIGN="top" STYLE="BORDER-BOTTOM:1px solid #000000">/s/ Matthew K. Fust</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Name:</TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;</FONT></TD>
<TD VALIGN="bottom">Matthew K. Fust</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Title:</TD>
<TD VALIGN="bottom"><FONT STYLE="font-size:8pt">&nbsp;</FONT></TD>
<TD VALIGN="bottom"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Executive Vice President and</P> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">Chief Financial
Officer</P></TD></TR>
</TABLE></DIV>

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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>EXHIBIT INDEX </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="bottom" NOWRAP> <P STYLE="border-bottom:1.00pt solid #000000; width:39.10pt; font-size:8pt; font-family:Times New Roman"><B>Exhibit&nbsp;No.</B></P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom" ALIGN="center" STYLE="border-bottom:1.00pt solid #000000"> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Description</B></P></TD></TR>


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<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" NOWRAP>99.1</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Notice of Anticipated Make-Whole Fundamental Change, dated as of September 24, 2013.</TD></TR>
</TABLE>
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8-K
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):
September 24, 2013
ONYX PHARMACEUTICALS, INC.
(Exact Name of Registrant as Specified in its Charter)
Delaware
000-28298
94-3154463
(State or other jurisdiction
of incorporation)
(Commission
File Number)
(IRS Employer
Identification No.)
249 East Grand Avenue
South San Francisco, California
94080
(Address of principal executive offices)
(Zip Code)
Registrant's telephone number, including area code: (650) 266-0000
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:
¨
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
¨
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
¨
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
¨
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Item 8.01 Other Events.
On September 24, 2013, Onyx Pharmaceuticals, Inc., a Delaware corporation (the "
Company
") delivered a notice (the
"
Notice
") to the Trustee (as defined below) and the holders of the Company's outstanding 4.00% Convertible Senior Notes due 2016 Notes of an anticipated Make-Whole Fundamental Change (as defined in the First Supplemental
Indenture, dated August 12, 2009, by and between the Company and Wells Fargo Bank, National Association, as trustee (the "
Trustee
")). A copy of the Notice is attached hereto as
Exhibit 99.1
and is incorporated into this
report by reference.
Additional Information about the Offer and the Merger and Where to Find It
This filing and the attached exhibit are neither an offer to buy nor a solicitation of an offer to sell any securities, including the Notes (as
defined in the Notice). Amgen Inc. and Arena Acquisition Company have filed a tender offer statement on Schedule TO with the Securities and Exchange Commission, and Onyx Pharmaceuticals, Inc. has filed a solicitation/recommendation statement on
Schedule 14D-9 with respect to the Offer (as defined in the Notice). Onyx Pharmaceuticals, Inc. stockholders and other investors should read the tender offer statement (including the offer to purchase, related letter of transmittal and other Offer
documents) and the solicitation/recommendation statement carefully because they contain important information, including the terms and conditions of the Offer. Onyx Pharmaceuticals, Inc. stockholders and other investors will be able to obtain copies
of these materials without charge from the SEC through the SEC's website at www.sec.gov, from Onyx Pharmaceuticals, Inc. (with respect to documents filed by Onyx Pharmaceuticals, Inc. with the SEC), or from Amgen Inc. (with respect to documents
filed by Amgen Inc. and Arena Acquisition Company). Stockholders and other investors are urged to read carefully those materials prior to making any decisions with respect to the Offer or the Notes.
Forward-Looking Statements
Statements in
this Current Report on Form 8-K and the documents that the Company has filed with the SEC that are incorporated by reference in this Current Report on Form 8-K may contain, in addition to historical information, certain statements that are
"forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. The Company has identified some of these
forward-looking statements with words like "believe," "may," "could," "would," "might," "possible," "will," "should," "expect," "intend,"
"plan," "anticipate," or "continue," the negative of these words, other terms of similar meaning or the use of future dates. Forward-looking statements in this Current Report on Form 8-K and the documents that the
Company has filed with the SEC that are incorporated by reference in this Current Report on Form 8-K include without limitation statements regarding planned completion of the Offer and the Merger (as defined in the Notice). These statements are
subject to risks and uncertainties that could cause actual results and events to differ materially from those anticipated, including, but not limited to, risks and uncertainties related to: uncertainties as to the timing of the transaction;
uncertainties as to the percentage of Onyx stockholders tendering their shares in the offer; the possibility that competing offers will be made; the possibility that various closing conditions for the transaction may not be satisfied or waived,
including that a governmental entity may prohibit, delay or refuse to grant approval for the consummation of the transaction; the effects of disruption caused by the transaction making it more difficult to maintain relationships with employees,
collaborators, vendors and other business partners; the risk that stockholder litigation in connection with the transaction may result in significant costs of defense, indemnification and liability; Nexavar
®
(sorafenib) tablets, Kyprolis
®
(carfilzomib) for Injection and Stivarga
®
(regorafenib) tablets being the only approved products from which the Company may obtain revenue; competition; failures or delays in the Company's clinical trials or the regulatory process; dependence on the Company's collaborative
relationship with Bayer; supply of Nexavar, Stivarga or Kyprolis; market acceptance and the rate of adoption of Nexavar, Stivarga and Kyprolis; pharmaceutical pricing and reimbursement pressures; serious adverse side effects, if they are associated
with Nexavar, Stivarga or Kyprolis; government regulation; possible failure to realize the anticipated benefits of business acquisitions or strategic investments; protection of the Company's intellectual property; product liability risks; and
other risks and uncertainties discussed in the Company's filings with the SEC, including the "Risk Factors" sections of the Company's most recent annual report on Form 10-K and subsequent quarterly reports on Form 10-Q, as well
as the tender offer documents filed by Amgen Inc. and Arena Acquisition Company, and the Solicitation/Recommendation Statement filed by the Company. The Company undertakes no obligation to update any forward-looking statements as a result of new
information, future developments or otherwise, except as expressly required by law. All forward-looking statements in this Current Report on Form 8-K and the documents that the Company has filed with the SEC that are incorporated by reference in
this Current Report on Form 8-K are qualified in their entirety by this cautionary statement.
Item 9.01 Financial Statements and Exhibits.
(d) Exhibits
99.1
Notice of Anticipated Make-Whole Fundamental Change, dated as of September 24, 2013.
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.
Dated as of September 24, 2013
ONYX PHARMACEUTICALS, INC.
By:
/s/ Matthew K. Fust
Name:
Matthew K. Fust
Title:
Executive Vice President and
Chief Financial
Officer
EXHIBIT INDEX
Exhibit No.
Description
99.1
Notice of Anticipated Make-Whole Fundamental Change, dated as of September 24, 2013.