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):
September 3, 2010

Trubion Pharmaceuticals, Inc.

(Exact Name of Registrant as Specified in Charter)

Delaware
(State or Other Jurisdiction
of Incorporation) 001-33054
(Commission File No.) 52-2385898
(IRS Employer
Identification No.)

2401 Fourth Avenue, Suite 1050, Seattle, WA 98121
(Address of Principal Executive Offices, including Zip Code)

(206) 838-0500
(Registrant’s Telephone Number, Including Area Code)

None
(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:

þ     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 8.01. Other Events.

On September 8, 2010, Trubion Pharmaceuticals, Inc.(“Trubion”) announced that the U.S. Department of Justice and Federal Trade Commission granted early termination of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 (“HSR Act”), as amended, with respect to the planned acquisition of Trubion by Emergent BioSolutions Inc. A copy of the press release is filed herewith as Exhibit 99.1 and is incorporated by reference.

Additional Information about the Transaction and Where to Find It

In connection with the transaction, Emergent intends to file with the Securities and Exchange Commission (SEC) a registration statement on Form S-4 and Trubion intends to file with the SEC and mail to its stockholders a proxy statement/prospectus. Investors and stockholders are urged to read the registration statement, the proxy statement/prospectus and other relevant documents filed with the SEC when they become available, as well as any amendments or supplements to the documents because they will contain important information about Emergent, Trubion and the merger.

The registration statement, the proxy statement/prospectus and any other relevant materials (when they become available), and any other documents filed by Emergent and/or Trubion with the SEC, may be obtained free of charge at the SEC’s web site at www.sec.gov. In addition, investors and stockholders may obtain free copies of the documents filed with the SEC by directing a written request to: Emergent BioSolutions Inc., Attn: Investor Relations, 2273 Research Boulevard, Suite 400, Rockville, Maryland 20850, or Trubion Pharmaceuticals, Inc., Attn: Investor Relations, 2401 4th Avenue, Suite 1050, Seattle, Washington 98121. Investors and stockholders are urged to read the registration statement, the proxy statement/prospectus and the other relevant materials when they become available.

Participants in Solicitations

Emergent, Trubion and their respective directors, executive officers and other members of their management and employees may be deemed to be participants in the solicitation of proxies in connection with the merger. Information regarding Emergent’s directors and officers is available in Emergent’s proxy statement on Schedule 14A for its 2010 annual meeting of stockholders, which was filed with the SEC on April 9, 2010. Information regarding Trubion’s directors and executive officers is available in Trubion’s proxy statement on Schedule 14A for its 2010 annual meeting of stockholders, which was filed with the SEC on April 21, 2010. Additional information regarding the interests of such potential participants will be included in the proxy statement and the other relevant documents filed with the SEC when they become available.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

99.1 Press Release issued by Trubion Pharmaceuticals, Inc. dated September 8, 2010

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.

	TRUBION PHARMACEUTICALS, INC.
Date: September 8, 2010	By:	/s/ John A. Bencich
		Name:	John A. Bencich
		Title:	Vice President and Chief Financial Officer

INDEX TO EXHIBITS

Exhibit No.	Description
99.1	Press Release issued by Trubion Pharmaceuticals, Inc dated September 8, 2010

EX-99.1

Exhibit 99.1

For Release 1 p.m. PDT
Sept. 8, 2010

Trubion Pharmaceuticals Announces Early Termination of HSR Waiting Period

SEATTLE, SEPT. 8, 2010 — Trubion Pharmaceuticals, Inc. (NASDAQ: TRBN) today announced that the U.S. Department of Justice and Federal Trade Commission granted early termination of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 (“HSR Act”), as amended, with respect to the planned acquisition of Trubion by Emergent BioSolutions Inc. (NYSE: EBS) announced on Aug. 12, 2010. Accordingly, the requirement under the merger agreement for the expiration or termination of any waiting period under the HSR Act has been satisfied. The closing of the transaction still remains subject to other conditions in the definitive merger agreement, including approval by Trubion’s stockholders.

About Trubion

Trubion is a biopharmaceutical company that is creating a pipeline of novel protein therapeutic product candidates to treat autoimmune and inflammatory diseases and cancer. The Company’s mission is to develop a variety of first-in-class and best-in-class product candidates, customized for optimal safety, efficacy and convenience that it believes may offer improved patient experiences. Trubion’s current product candidates are novel single-chain protein, or SMIP, therapeutics, and are designed using its custom drug assembly technology. Trubion’s product pipeline includes CD20-directed SMIP therapeutics such as SBI-087 for autoimmune and inflammatory diseases, developed under the Company’s Pfizer collaboration. Trubion’s product pipeline also includes TRU-016, a novel CD37-targeted therapy for the treatment of B-cell malignancies developed under the Company’s Abbott collaboration. In addition to Trubion’s current clinical stage product pipeline, the Company is also developing its multi-specific SCORPION technology, both for targeting cell-surface molecules as well as simultaneously neutralizing soluble ligands. More information is available in the investors section of Trubion’s website: http://investors.trubion.com/index.cfm.

Additional Information About the Transaction and Where to Find It

This press release shall not constitute an offer to purchase or a solicitation of an offer to sell securities. In connection with this transaction, Emergent intends to file with the Securities and Exchange Commission (SEC) a registration statement on Form S-4 and Trubion intends to file with the SEC and mail to its stockholders a proxy statement/prospectus. Investors and stockholders are urged to read the registration statement, the proxy statement/prospectus and other relevant documents filed with the SEC when they become available, as well as any amendments or supplements to the documents, because they will contain important information about Emergent, Trubion and the transaction.

The registration statement, the proxy statement/prospectus and any other relevant materials (when they become available), and any other documents filed by Emergent and/or Trubion with the SEC, may be obtained free of charge at the SEC’s website at http://www.sec.gov. In addition, investors and stockholders may obtain free copies of the documents filed with the SEC by directing a written request to Emergent BioSolutions Inc., Attn: Investor Relations, 2273 Research Blvd., Suite 400, Rockville, MD 20850, or Trubion Pharmaceuticals Inc., Attn: Investor Relations, 2401 4th Ave., Suite 1050, Seattle, WA 98121. Investors and stockholders are urged to read the registration statement, the proxy statement/prospectus and the other relevant materials when they become available.

Participants in Solicitations

Emergent, Trubion and their respective directors, executive officers and other members of their management and employees may be deemed to be participants in the solicitation of proxies from stockholders of Trubion in connection with the merger. Information regarding Emergent’s directors and officers is available in Emergent’s proxy statement on Schedule 14A for its 2010 annual meeting of stockholders, which was filed with the SEC on April 9, 2010. Information regarding Trubion’s directors and executive officers is available in Trubion’s proxy statement on Schedule 14A for its 2010 annual meeting of stockholders, which was filed with the SEC on April 21, 2010. Additional information regarding the

interests of such potential participants will be included in the proxy statement and the other relevant documents filed with the SEC when they become available.

Forward-Looking Statements

This release contains certain forward-looking statements that involve known and unknown risks, delays, uncertainties and other factors not under the control of Trubion. The company’s actual results, performance or achievements could be materially different from those projected by these forward-looking statements. The factors that could cause actual results, performance or achievements to differ from the forward-looking statements include the risk that the acquisition of Trubion by Emergent may not be consummated for reasons including that the conditions precedent to the completion of the acquisition may not be satisfied; the risk that one or more of the milestones that would give rise to CVR payments is not achieved; the possibility that the expected benefits from the proposed merger will not be realized, or will not be realized within the anticipated time period; the risk that Emergent and Trubion’s businesses will not be integrated successfully; the possibility of disruption from the merger making it more difficult to maintain business and operational relationships; any actions taken by either of the companies, including, but not limited to, restructuring or strategic initiatives (including capital investments or asset acquisitions or dispositions); and other risks that are discussed in Trubion’s filings with the SEC, such as its Form 10-K, 10-Q and 8-K reports. Given these risks and uncertainties, you are cautioned not to place undue reliance on the forward-looking statements.

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TRBN-G

Contact:
Jim DeNike
Senior Director, Corporate and Marketing Communications
Trubion Pharmaceuticals, Inc.
(206) 838-0500
jdenike@trubion.com
http://www.trubion.com

Amy Petty
Account Manager
Waggener Edstrom Worldwide Healthcare
(617) 234-4102
amyp@waggeneredstrom.com