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  <TITLE> Sipex Corporation (Form: 8-K) </TITLE>
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  		UNITED STATES<BR>
  	SECURITIES AND EXCHANGE COMMISSION
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  	WASHINGTON, D.C. 20549
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  	FORM 8-K
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  	CURRENT REPORT
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  	Pursuant to Section&nbsp;13 or 15(d) of the Securities Exchange Act of 1934
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  	Date of Report (Date of Earliest Event Reported):
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  	&nbsp;
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  	February 22, 2007
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  	Sipex Corporation
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  <BR>__________________________________________<BR>
  	(Exact name of registrant as specified in its charter)
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  	&nbsp;
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  	Delaware
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  	000-27892
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  	04-6135748
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  _____________________<BR>
  	(State or other jurisdiction
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  _____________<BR>
  	(Commission
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  ______________<BR>
  	(I.R.S. Employer
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  	of incorporation)
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  	File Number)
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  	Identification No.)
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  	&nbsp;&nbsp;
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  	&nbsp;
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  	233 South Hillview Drive, Milpitas, California
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  	&nbsp;
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  	95035
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  _________________________________<BR>
  	(Address of principal executive offices)
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  	&nbsp;
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  ___________<BR>
  	(Zip Code)
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  	Registrant&#146;s telephone number, including area code:
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  	408-934-7500
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  	Not Applicable
  <BR>______________________________________________<BR>
  	Former name or former address, if changed since last report
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  	&nbsp;
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  <!-- CoverPageRegistrant END --><P><FONT SIZE="2">
  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:</FONT>
  </P>
  <P><FONT SIZE="2">
  [&nbsp;&nbsp;]&nbsp;&nbsp;Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)<br>
  [&nbsp;&nbsp;]&nbsp;&nbsp;Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)<br>
  [&nbsp;&nbsp;]&nbsp;&nbsp;Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))<br>
  [&nbsp;&nbsp;]&nbsp;&nbsp;Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))<br>
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  <FONT SIZE="2">Top of the Form</FONT>
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  <B>
  	Item 3.03 Material Modifications to Rights of Security Holders.
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  The information set forth in Item 5.03 is incorporated herein by reference.
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  	Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.
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  <FONT SIZE="2">
  On February 22, 2007 Sipex Corporation ("Sipex") filed an amendment (the "Amendment") to Sipex&#x2019;s Amended and Restated Certificate of Incorporation with the Secretary of State of the State of Delaware which provides for a 1-for-2 reverse stock split of Sipex&#x2019;s common stock.  The reverse stock split was previously approved by Sipex&#x2019;s stockholders at a special meeting of stockholders held on January 30, 2007.  The Amendment provides that the reverse split became effective at 1:31 p.m. Pacific Standard Time on February 23, 2007. <br><br>As a result of the reverse stock split, each two shares of Sipex&#x2019;s currently issued and outstanding common stock as of the close of business on February 23, 2007 were automatically converted into and reconstituted as one share of new common stock.<br><br>A copy of the Certificate of Amendment is attached hereto as Exhibit 3.1 and is incorporated herein by reference.  In addition, a copy of a press release issued by Sipex concerning the reverse stock split is provided herewith as Exhibit 99.1 and is incorporated herein by reference. <br>
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  	Item 8.01 Other Events.
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  In conjunction with the 1-for-2 reverse stock split, Sipex&#x2019;s ticker symbol will be changed to SXCP effective March 1, 2007.
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  <B>
  	Item 9.01 Financial Statements and Exhibits.
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  (c) Exhibits. <br><br>3.1  Certificate of Amendment to Amended and Restated Articles of Incorporation of SipexCorporation dated February 22, 2007<br><br>99.1 Press release, dated February 22, 2007, entitled "Sipex Announces Reverse Stock Split"
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  	SIGNATURES
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  	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.
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  	Sipex Corporation
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  	&nbsp;&nbsp;
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  	&nbsp;
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  <I>
  	February 28, 2007
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  	&nbsp;
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  <I>
  	By:
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  	&nbsp;
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  <I>
  	Clyde R. Wallin
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  <BR>
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  	&nbsp;
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  <I>
  	Name: Clyde R. Wallin
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  	&nbsp;
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  <I>
  	Title: Chief Financial Officer and Senior VP of Finance
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  	Exhibit&nbsp;Index
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  <B>
  	Exhibit No.
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  	&nbsp;
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  	Description
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  	3.1
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  	&nbsp;
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  <FONT SIZE="2">
  Certificate of Amendment to Amended and Restated Articles of Incorporation of SipexCorporation dated February 22, 2007
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  	99.1
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  	&nbsp;
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  <FONT SIZE="2">
  Press release, dated February 22, 2007, entitled &#x201C;Sipex Announces Reverse Stock Split&#x201D;
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metadata_documents: [{"type": "8-K", "sequence": "1", "filename": "htm_18546.htm", "description": "LIVE FILING", "secsgml_size_bytes": 12070}]
metadata_filer: {"company-data": {"conformed-name": "SIPEX CORP", "cik": "0001007800", "assigned-sic": "3674", "irs-number": "046135748", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-27892", "film-number": "07658536"}, "business-address": {"street1": "233 SOUTH HILLVIEW DRIVE", "city": "MILPITAS", "state": "CA", "zip": "95035", "phone": "408-934-7500"}, "mail-address": {"street1": "233 SOUTH HILLVIEW DRIVE", "city": "MILPITAS", "state": "CA", "zip": "95035"}}
text: Sipex Corporation (Form: 8-K)
  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):
  February 22, 2007
  Sipex Corporation
  __________________________________________
  (Exact name of registrant as specified in its charter)
  Delaware
  000-27892
  04-6135748
  _____________________
  (State or other jurisdiction
  _____________
  (Commission
  ______________
  (I.R.S. Employer
  of incorporation)
  File Number)
  Identification No.)
  233 South Hillview Drive, Milpitas, California
  95035
  _________________________________
  (Address of principal executive offices)
  ___________
  (Zip Code)
  Registrant's telephone number, including area code:
  408-934-7500
  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))
  Top of the Form
  Item 3.03 Material Modifications to Rights of Security Holders.
  The information set forth in Item 5.03 is incorporated herein by reference.
  Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.
  On February 22, 2007 Sipex Corporation ("Sipex") filed an amendment (the "Amendment") to Sipex's Amended and Restated Certificate of Incorporation with the Secretary of State of the State of Delaware which provides for a 1-for-2 reverse stock split of Sipex's common stock.  The reverse stock split was previously approved by Sipex's stockholders at a special meeting of stockholders held on January 30, 2007.  The Amendment provides that the reverse split became effective at 1:31 p.m. Pacific Standard Time on February 23, 2007.
  As a result of the reverse stock split, each two shares of Sipex's currently issued and outstanding common stock as of the close of business on February 23, 2007 were automatically converted into and reconstituted as one share of new common stock.
  A copy of the Certificate of Amendment is attached hereto as Exhibit 3.1 and is incorporated herein by reference.  In addition, a copy of a press release issued by Sipex concerning the reverse stock split is provided herewith as Exhibit 99.1 and is incorporated herein by reference.
  Item 8.01 Other Events.
  In conjunction with the 1-for-2 reverse stock split, Sipex's ticker symbol will be changed to SXCP effective March 1, 2007.
  Item 9.01 Financial Statements and Exhibits.
  (c) Exhibits.
  3.1  Certificate of Amendment to Amended and Restated Articles of Incorporation of SipexCorporation dated February 22, 2007
  99.1 Press release, dated February 22, 2007, entitled "Sipex Announces Reverse Stock Split"
  Top of the Form
  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.
  Sipex Corporation
  February 28, 2007
  By:
  Clyde R. Wallin
  Name: Clyde R. Wallin
  Title: Chief Financial Officer and Senior VP of Finance
  Top of the Form
  Exhibit Index
  Exhibit No.
  Description
  3.1
  Certificate of Amendment to Amended and Restated Articles of Incorporation of SipexCorporation dated February 22, 2007
  99.1
  Press release, dated February 22, 2007, entitled "Sipex Announces Reverse Stock Split"