425

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): August 12, 2010

Emergent BioSolutions Inc.

(Exact Name of Registrant as Specified in Charter)

Delaware
(State or Other Jurisdiction
of Incorporation) 001-33137
(Commission File Number) 14-1902018
(IRS Employer
Identification No.)

2273 Research Boulevard, Suite 400, Rockville, Maryland
(Address of Principal Executive Offices) 20850
(Zip Code)

Registrant’s telephone number, including area code: (301) 795-1800

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 (see General Instruction A.2. below):

þ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

þ 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.

The following information was prepared in connection with Emergent BioSolutions Inc.’s meeting with employees of Trubion Pharmaceuticals, Inc. held on August 19, 2010 to provide an introduction to Emergent.

Additional Information and Where to Find It

This communication is being made in connection with the proposed merger (the “Merger”) among Emergent BioSolutions Inc. (“Emergent”), Trubion Pharmaceuticals, Inc. (“Trubion”) and certain of Emergent’s direct and indirect wholly-owned subsidiaries. Emergent intends to file with the Securities and Exchange Commission (the “SEC”) a registration statement on Form S-4, which will contain a prospectus relating to the securities Emergent intends to issue in the proposed Merger. Trubion intends to file a preliminary proxy statement in connection with the proposed Merger and to mail a definitive proxy statement and other relevant documents to Trubion’s stockholders. Stockholders of Emergent and Trubion and other interested persons are advised to read, when available, the registration statement and Trubion’s preliminary proxy statement, and amendments thereto, and definitive proxy statement in connection with Trubion’s solicitation of proxies for the special meeting to be held to approve the Merger because these documents will contain important information about Trubion, Emergent and the proposed Merger. The definitive proxy statement will be mailed to stockholders as of a record date to be established for voting on the Merger. Stockholders will also be able to obtain a copy of the documents filed with the SEC, without charge, once available, at the SEC’s website at http://www.sec.gov or by directing a request to: Emergent BioSolutions Inc., Attn: Investor Relations, 2273 Research Boulevard, Suite 400, Rockville, Maryland 20850, or Trubion Pharmaceuticals, Inc., Attention: Investor Relations, 2401 4th Avenue, Suite 1050, Seattle, Washington, 98121.

Participants in Solicitation

Emergent, Trubion and their respective directors and officers may be deemed participants in the solicitation of proxies from Trubion’s stockholders. Information regarding Emergent’s directors and officers is available in Emergent’s proxy statement for its 2010 annual meeting of stockholders and its 2009 annual report on Form 10-K, which were filed with the SEC and are available at the SEC’s website at http://www.sec.gov. Information regarding Trubion’s directors and officers is available in Trubion’s proxy statement for its 2010 annual meeting of stockholders and its 2009 annual report on Form 10-K, which were filed with the SEC and are available at the SEC’s website at http://www.sec.gov. Information regarding Trubion’s directors and officers will also be contained in Trubion’s proxy statement in connection with the Merger when it becomes available. Emergent’s and Trubion’s stockholders may obtain additional information about the interests of Trubion’s directors and officers in the Merger by reading Trubion’s proxy statement when it becomes available.

Item 9.01. Financial Statements and Exhibits.

     (d) Exhibits

          See Exhibit Index attached to this Form 8-K, which is incorporated herein by reference.

SIGNATURE

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: August 19, 2010	EMERGENT BIOSOLUTIONS INC.
	By:	/s/ R. Don Elsey
		R. Don Elsey
		Chief Financial Officer

INDEX TO EXHIBITS

Exhibit No.		Description
	99.1	Presentation

EX-99.1

Exhibit 99.1

Corporate Overview All Employee Meeting at Trubion's Corporate HQ PLEASE NOTE: ALL TITLE SLIDES BASED ON A TITLE MASTER IN AUTO LAYOUT DATE AUTOMATIC TO TURN OFF: [View>Header and Footer...] On Slide tab, uncheck Date and Time, then click Apply

This presentation includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Any statements, other than statements of historical fact, including statements regarding our strategy, future operations, future financial position, future revenues, projected costs, prospects, plans and objectives of management, including any potential future securities offering, our expected revenue growth and net earnings for 2010, and any other statements containing the words "believes", "expects", "anticipates", "plans", "estimates" and similar expressions, are forward-looking statements. There are a number of important factors that could cause the company's actual results to differ materially from those indicated by such forward-looking statements, including appropriations for BioThrax(r) procurement; our ability to obtain new BioThrax(r) sales contracts; our plans to pursue label expansions and improvements for BioThrax(r); our ability to win a development award with the U.S. government for our recombinant protective antigen anthrax vaccine candidate; our plans to expand our manufacturing facilities and capabilities; the rate and degree of market acceptance and clinical utility of our products; the success of our ongoing and planned development programs, preclinical studies and clinical trials; our ability to identify and acquire or in license products and product candidates that satisfy our selection criteria; the potential benefits of our existing collaboration agreements and our ability to enter into selective additional collaboration arrangements; the timing of and our ability to obtain and maintain regulatory approvals for our other product candidates; our commercialization, marketing and manufacturing capabilities and strategy; our estimates regarding expenses, future revenue, capital requirements and needs for additional financing; and other factors identified in the company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2010 and subsequent reports filed with the SEC. The company disclaims any intention or obligation to update any forward-looking statements as a result of developments occurring after the date of this presentation. The guidance in this presentation is only effective as of the date given, August 5, 2010, and will not be updated or affirmed unless and until the Company publicly announces updated or affirmed guidance. Emergent BioSolutions Forward-Looking Statements / Note on Guidance

Market Focus Infectious disease market Unmet medical needs & underserved global markets Product Focus Immune-related biologics (e.g., vaccines & antibody therapies) Disease Focus Anthrax Tuberculosis Typhoid Universal Flu Chlamydia Customer Focus Government Private Sector Corporate Overview Clear Business Focus

Microscience Ltd (UK) acquired Antex Biologics (US) acquired Michigan Biologics Products Institute assets acquired Lansing facility renovation approved by FDA ViVacs GmbH (Germany) acquired 1998 IPO and NYSE listing completed 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 Joint venture with University of Oxford formed rPA candidate acquired Anthrax monoclonal candidate acquired Baltimore facility acquired 4-year expiry dating for BioThrax(r) granted by FDA Corporate Overview Successful Track Record of Acquisitions and Delivering Results

Product Preclinical Phase I Phase II Phase III Marketed BioThrax(r) (Anthrax Vaccine Adsorbed) Tuberculosis Vaccine (MVA85A) Clinical Anthrax Immune Globulin (AIG) Parallel studies1 Licensed TyphellaTM (Typhoid Vaccine Live Oral ZH9) Recombinant Anthrax Vaccine (rPA) Universal Flu Vaccine 1 A critical human clinical study has begun and is expected to proceed in parallel with non-clinical studies under the FDA "Animal Rule." * Development funding from U.S. government or NGO. Chlamydia Vaccine Pre-Clinical Anthrax Monoclonal Therapeutic (MAb) Corporate Overview Broad Product Portfolio (targeting Infectious Diseases)

Type of Contract Funding Agency Description Term Expected Timing Potential Total Contract Amount Development BARDA Large-scale Manufacturing Process for BioThrax(r) (Building 55) Multi Year Announced 07/13/10 $107M Development BARDA rPA Development Multi Year End of 3Q >$200M Procurement CDC/HHS Doses of BioThrax(r) Multi Year (begin 3Q '11) Year End >$400M TOTAL TOTAL TOTAL TOTAL TOTAL >$700M Corporate Overview 2010 Key Corporate Milestones

Total Revenues -- $62.1M $108.9M Net Income -- $9.8M $12.3M EPS -- $0.32 $0.40 Cash Balance -- $102.9M* * Excluding accounts receivable of $45.8M Corporate Overview Recent Announcement - 2Q / 6 Month 2010 Financial Performance 2Q10 6M10

2005 2006 2007 2008 2009 2010P Total 131 153 182.915 178.718 234.786 275 25 $131 $153 $183 $234 $179 $300 to $275 Total Revenue ($ millions) 2005 2006 2007 2008 2009 2010P Total 16 23 23 21 31 40 10 $16 $23 $23 $31 $21 $50 to $40 Net Income ($ millions) Corporate Overview Continued Revenue Growth and Profitability

Signed Doses Contract Value Contract Term Delivery Status September 2004 5M $124M September 2004 to September 2007 Completed May 2005 5M $120M May 2005 to May 2006 Completed May 2006 5M $123M May 2006 to May 2007 Completed September 2007 18.75M $448M September 2007 to September 2010 Completed October 2008 14.5M $405M September 2009 to September 2011 Completion anticipated 2Q/3Q 2011 TOTAL 48.25M $1,220M Current contract YE 2009: Current SNS of ~20M doses of BioThrax(r) Continuing History of Delivery Under USG Contracts Corporate Overview

Product Partner $ (millions) BioThrax(r) dual adjuvant NIAID/BARDA 30 AIG NIAID 13 Anthrax MAb NIAID/BARDA 24 rPA NIAID/BARDA 1001 Typhoid Vaccine (TyphellaTM) Wellcome Trust (UK) 2 TB Vaccine (MVA85A) Wellcome Trust (UK) / AERAS (US) 16 TOTAL TOTAL $185 TB Chlamydia Flu Typhoid Anthrax 1 Reflects funding by NIAID prior to EBS acquisition of rPA candidate. Extensive USG and NGO Funding for R&D Pipeline Corporate Overview

2010P 2011P 2012P 2013P 2014P Building 12 7 7.5 8 7 Building 55 0 0 0 18 25 7.0 7.5 25.0 Building 12 Building 551 1 Assumes one 1320L fermentation train; second fermentation train for surge requirement Total Capacity (millions) 8.0 25.0 Expanding Lansing Manufacturing Capacity Corporate Overview

Anthrax TB Typhoid Flu Chlamydia Baltimore Facility Baltimore Facility Baltimore Facility Facility Size 56,000 sq. ft. Including 11,000 sq. ft. for manufacturing 56,000 sq. ft. Including 11,000 sq. ft. for manufacturing Production Configuration Multiple segregated production suites Concurrent manufacturing Multiple segregated production suites Concurrent manufacturing Manufacturing Capabilities VIRAL NON-VIRAL Manufacturing Capabilities TB, Flu, Chlamydia rPA, MAb Manufacturing Capability for R&D Pipeline Corporate Overview

Near term growth from licensed vaccine BioThrax(r) Medium term growth from high value R&D pipeline Longstanding financial strength Corporate Overview Company Highlights

Corporate Overview All Employee Meeting at Trubion's Corporate HQ PLEASE NOTE: ALL TITLE SLIDES BASED ON A TITLE MASTER IN AUTO LAYOUT DATE AUTOMATIC TO TURN OFF: [View>Header and Footer...] On Slide tab, uncheck Date and Time, then click Apply