Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Expires: January 31, 2005
Estimated average burden hours per response... 0.5

(Print or Type Responses)
1. Name and Address of Reporting Person *
BENJAMIN JERRY
  2. Issuer Name and Ticker or Trading Symbol
MICROMET, INC. [MITI]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
C/O ADVENT VENTURE PARTNERS, 25 BUCKINGHAM GATE
3. Date of Earliest Transaction (Month/Day/Year)
05/05/2006
(Street)

LONDON, X0 SW1E 6LD
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock (1) 05/05/2006   J(2)   3,528,875 (3) A (2) 3,528,875 (3) I By Fund (3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number. SEC 1474 (9-02)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (right to buy) (1) $ 6.63 05/05/2006   A   35,000     (4) 05/04/2016 Common Stock 35,000 $ 0 35,000 D  
Stock Option (right to buy) (1) $ 6.63 05/05/2006   A   5,000     (5) 05/04/2016 Common Stock 5,000 $ 0 40,000 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
BENJAMIN JERRY
C/O ADVENT VENTURE PARTNERS
25 BUCKINGHAM GATE
LONDON, X0 SW1E 6LD
  X   X    

Signatures

 /s/ Alex Driggs, attorney-in-fact   05/09/2006
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) All shares reported herein are shown after the effects of a 1-for-3 reverse stock split effected by the Issuer on May 5, 2006.
(2) Received in exchange for 672,519 shares of common stock of Micromet Holdings, Inc., a privately held company, in connection with the merger of Carlsbad Acquisition Corp., a wholly-owned subsidiary of the Issuer, into Micromet Holdings, Inc. (the "Merger"). On the effective date of the Merger, the closing price of the Issuer's common stock was $2.17 per share.
(3) Consists of: (i) 1,785,787 shares held of record by Advent Private Equity Fund III ?A? Limited Partnership; (ii) 874,759 shares held of record by Advent Private Equity Fund III ?B? Limited Partnership; (iii) 244,118 shares held of record by Advent Private Equity Fund III ?C? Limited Partnership; (iv) 480,071 shares held of record by Advent Private Equity Fund III ?D? Limited Partnership; (v) 69,111 shares held of record by Advent Private Equity Fund III GmbH & Co. KG; (vi) 57,189 shares held of record by Advent Private Equity Fund III Affiliates Limited Partnership; and (vii) 17,840 shares held of record by Advent Management III Limited Partnership. The reporting person is a general partner of each of the foregoing entities. The reporting person disclaims beneficial ownership of the shares reported herein except to the extent of his pecuniary interest therein.
(4) The option vests over three years, in 36 equal monthly installments.
(5) The option vests over one year, in equal monthly installments.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.