Filed
Pursuant to Rule 433
Issuer
Free Writing Prospectus dated March 11, 2010
Relating
to Preliminary Prospectus dated March 9, 2010
Registration
No. 333-162541
10,000,000
Shares
Micromet,
Inc.
Common
Stock
The following information relates
only to the securities described below and should be read together with the
preliminary prospectus supplement dated March 9, 2010, including the documents
incorporated by reference therein and the accompanying prospectus dated November
2, 2009 and the documents incorporated by reference therein relating to these
securities. The following information supplements and updates the information
contained in the preliminary prospectus supplement and accompanying
prospectus. To review the preliminary prospectus included in the
registration statement, click the following link on the SEC website at
www.sec.gov as follows (or if such address has
changed, by reviewing the Company’s filings for the relevant date on the SEC web
site): http://www.sec.gov/Archives/edgar/data/1131907/000114420410012323/v176727_424b5.htm
Common
Stock to be Outstanding Immediately Following this Offering:
The
information on page S-3 of the Preliminary Prospectus has been updated as
follows:
There will be 79,212,460 shares of
common stock outstanding immediately following this offering, based on
69,212,460 shares issued and outstanding as of March 9, 2010, which does not
include, as of that date:
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9,449,928
shares of common stock issuable upon the exercise of outstanding options,
with a weighted average exercise price of $3.66 per
share;
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8,140,975
shares of common stock issuable upon the exercise of outstanding warrants,
with a weighted average exercise price of $3.92 per share;
and
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3,395,336
shares of common stock reserved for future issuance under our stock-based
compensation plans, consisting of 2,875,236 shares of common stock
reserved for issuance under our 2003 Amended and Restated Equity Incentive
Plan, 285,281 shares of common stock reserved for issuance under our 2006
Equity Incentive Award Plan and 234,819 shares of common stock reserved
for issuance under our Employee Stock Purchase
Plan.
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The
foregoing assumes no exercise of the underwriters’ option to purchase 1,500,000
additional shares of our common stock.
The
issuer has filed a registration statement (including a prospectus) and
preliminary prospectus supplement (the “Preliminary Prospectus”) with the SEC
for the offering to which this communication relates. Before you invest, you
should read the prospectus in that registration statement, the Preliminary
Prospectus and other documents the issuer has filed with the SEC for more
complete information about the issuer and this offering. You may get these
documents for free by visiting EDGAR on the SEC’s website at www.sec.gov. Copies
of the Preliminary Prospectus may be obtained from Goldman, Sachs & Co.,
Prospectus Department, by calling toll-free 1-866-471-2526.