SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549
SCHEDULE 13G
(Rule 13d-102)
INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
TO RULES 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED
PURSUANT TO 13d-2(b)
ALTEON INC.
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(Name of Issuer)
COMMON STOCK
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(Title of Class of Securities)
02144G107
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(CUSIP Number)
December 31, 2002
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(Date of Event which Requires Filing of this Statement)
Check the appropriate box to designate the one pursuant to which this Schedule
is filed:
[X] Rule 13d-1(b)
[X] Rule 13d-1(c)
[_] Rule 13d-1(d)
/1/ The remainder of this cover page shall be filled out for a reporting
person's initial filing on this with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.
The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 (the "Act") or otherwise subject to the liabilities of that section of the
Act but shall be subject to all other provisions of the Act (however, see the
Notes).
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CUSIP NO. 02144G 10 7 13G Page 2 of 9 Pages
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1 NAME OF REPORTING PERSON
S.S. or I.R.S. Identification No. Of Above Person
MPM BioEquities Adviser LLC
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
(a) [_]
(b) [X]
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3 SEC USE ONLY
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4 CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
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NUMBER OF 5 SOLE VOTING POWER
SHARES 1,652,900 (1)
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BENEFICIALLY 6 SHARED VOTING POWER
OWNED BY None
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EACH 7 SOLE DISPOSITIVE POWER
REPORTING 1,652,900 (1)
-------------------------------------------------------------
PERSON 8 SHARED DISPOSITIVE POWER
WITH None
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9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
1,652,900 (1)
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10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
[_]
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11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
5.2%
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12 TYPE OF REPORTING PERSON*
IA
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*SEE INSTRUCTIONS BEFORE FILLING OUT!
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CUSIP NO. 92829S 10 4 13G Page 3 of 9 Pages
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1 NAME OF REPORTING PERSON
S.S. or I.R.S. Identification No. Of Above Person
MPM BioEquities Master Fund L.P.
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
(a) [_]
(b) [x]
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3 SEC USE ONLY
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4 CITIZENSHIP OR PLACE OF ORGANIZATION
Bermuda
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NUMBER OF 5 SOLE VOTING POWER
SHARES 1,631,067 (1)
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BENEFICIALLY 6 SHARED VOTING POWER
OWNED BY None
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EACH 7 SOLE DISPOSITIVE POWER
REPORTING 1,631,067 (1)
-------------------------------------------------------------
PERSON 8 SHARED DISPOSITIVE POWER
WITH None
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9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
1,631,067 (1)
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10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
[_]
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11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
5.11%
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12 TYPE OF REPORTING PERSON*
PN
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*SEE INSTRUCTIONS BEFORE FILLING OUT!
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CUSIP NO. 02144G 10 7 13G Page 4 of 9 Pages
----------- --- ---
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1 NAME OF REPORTING PERSON
S.S. or I.R.S. Identification No. Of Above Person
MPM BioEquities GP L.P.
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
(a) [_]
(b) [X]
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3 SEC USE ONLY
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4 CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
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NUMBER OF 5 SOLE VOTING POWER
SHARES 1,652,900 (1)
-----------------------------------------------------------
BENEFICIALLY 6 SHARED VOTING POWER
OWNED BY None
-----------------------------------------------------------
EACH 7 SOLE DISPOSITIVE POWER
REPORTING 1,652,900 (1)
-----------------------------------------------------------
PERSON 8 SHARED DISPOSITIVE POWER
WITH None
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9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
1,652,900 (1)
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10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
[_]
--------------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
5.2%
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12 TYPE OF REPORTING PERSON*
PN
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*SEE INSTRUCTIONS BEFORE FILLING OUT!
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CUSIP NO. 02144G 10 7 13G Page 5 of 9 Pages
----------- --- ---
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1 NAME OF REPORTING PERSON
S.S. or I.R.S. Identification No. Of Above Person
MPM BioEquities GP LLC
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
(a) [_]
(b) [X]
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3 SEC USE ONLY
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4 CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
--------------------------------------------------------------------------------
NUMBER OF 5 SOLE VOTING POWER
SHARES 1,652,900 (1)
-------------------------------------------------------------
BENEFICIALLY 6 SHARED VOTING POWER
OWNED BY None
-------------------------------------------------------------
EACH 7 SOLE DISPOSITIVE POWER
REPORTING 1,652,900 (1)
-------------------------------------------------------------
PERSON 8 SHARED DISPOSITIVE POWER
WITH None
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9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
1,652,900 (1)
--------------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
[_]
--------------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
5.2%
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12 TYPE OF REPORTING PERSON*
OO
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*SEE INSTRUCTIONS BEFORE FILLING OUT!
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CUSIP NO. 02144G 10 7 13G Page 6 of 9 Pages
----------- --- ---
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1 NAME OF REPORTING PERSON
S.S. or I.R.S. Identification No. Of Above Person
MPM Capital II GP LLC
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
(a) [_]
(b) [X]
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3 SEC USE ONLY
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4 CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
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NUMBER OF 5 SOLE VOTING POWER
SHARES 1,652,900 (1)
-------------------------------------------------------------
BENEFICIALLY 6 SHARED VOTING POWER
OWNED BY None
-------------------------------------------------------------
EACH 7 SOLE DISPOSITIVE POWER
REPORTING 1,652,900 (1)
-------------------------------------------------------------
PERSON 8 SHARED DISPOSITIVE POWER
WITH None
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9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
1,652,900 (1)
--------------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
[_]
--------------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
5.2%
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12 TYPE OF REPORTING PERSON*
OO
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*SEE INSTRUCTIONS BEFORE FILLING OUT!
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CUSIP NO. 02144G 10 7 13G Page 7 of 9 Pages
----------- --- ---
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1 NAME OF REPORTING PERSON
S.S. or I.R.S. Identification No. Of Above Person
MPM BioEquities Investors Fund LLC
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
(a) [_]
(b) [X]
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3 SEC USE ONLY
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4 CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
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NUMBER OF 5 SOLE VOTING POWER
SHARES 8,100 (1)
-------------------------------------------------------------
BENEFICIALLY 6 SHARED VOTING POWER
OWNED BY None
-------------------------------------------------------------
EACH 7 SOLE DISPOSITIVE POWER
REPORTING 8,100 (1)
-------------------------------------------------------------
PERSON 8 SHARED DISPOSITIVE POWER
WITH None
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9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
8,100 (1)
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10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
[_]
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11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
0.025%
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12 TYPE OF REPORTING PERSON*
OO
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*SEE INSTRUCTIONS BEFORE FILLING OUT!
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CUSIP NO. 02144G 10 7 13G Page 8 of 9 Pages
----------- - -
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1 NAME OF REPORTING PERSON
S.S. or I.R.S. Identification No. Of Above Person
MPM BioEquities Fund GmbH & Co. KG
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2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
(a) [_]
(b) [X]
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3 SEC USE ONLY
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4 CITIZENSHIP OR PLACE OF ORGANIZATION
Germany
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NUMBER OF 5 SOLE VOTING POWER
SHARES 13,733 (1)
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BENEFICIALLY 6 SHARED VOTING POWER
OWNED BY None
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EACH 7 SOLE DISPOSITIVE POWER
REPORTING 13,733 (1)
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PERSON 8 SHARED DISPOSITIVE POWER
WITH None
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9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
13,733 (1)
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10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES*
[_]
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11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
0.043%
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12 TYPE OF REPORTING PERSON*
OO
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*SEE INSTRUCTIONS BEFORE FILLING OUT!
STATEMENT ON SCHEDULE 13G
Item 1(a). Name of Issuer:
Alteon Inc.
Item 1(b). Address of Issuer's Principal Executive Offices:
170 Williams Drive, Ramsey NJ 07446
Item 2(a). Names of Person Filing:
MPM BioEquities Adviser LLC
MPM BioEquities Master Fund L.P.
MPM BioEquities GP L.P.
MPM BioEquities GP LLC
MPM Capital II GP LLC
MPM BioEquities Investors Fund LLC
MPM BioEquities Fund GmbH & Co. KG
Item 2(b). Business Mailing Address for the Person Filing:
c/o MPM Capital L.P.
601 Gateway Blvd., Suite 350
South San Francisco, CA 94080
Item 2(c). Citizenship:
All entities were organized in Delaware, except MPM
BioEquities Master Fund L.P., which was formed under the laws
of Bermuda and MPM BioEquities Fund GmbH & Co. KG which was
formed in Germany.
Item 2(d). Title of Class of Securities:
Common Stock
Item 2(e). CUSIP Number:
02144G107
Item 3. If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b),
check whether the person filing is a:
MPM BioEquities Adviser LLC is an investment adviser in
accordance with Rule 13d-1(b) (1) (ii) (E).
Item 4. Ownership:
(a) Amount Beneficially Owned:
1,652,900 shares of Common Stock (1)
(b) Percent of Class Owned:
5.2%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote:
1,652,900 shares of Common Stock (1)
(ii) shared power to vote or to direct the vote:
None
(iii) sole power to dispose or to direct the disposition of:
1,652,900 shares of Common Stock (1)
(iv) shared power to dispose or to direct the disposition
of:
None
Item 5. Ownership of Five Percent or Less of a Class:
Not Applicable
Item 6. Ownership of More than Five Percent on Behalf of Another Person:
Various persons have the right to receive or the power to direct
the receipt of dividends from, or the proceeds from the sale of,
the shares to which this statement relates. No one person's
interest in such shares is more than five percent of the total
outstanding stock of the Issuer.
Item 7. Identification and Classification of the Subsidiary Which Acquired the
Security Being Reported on By the Parent Holding Company:
Not Applicable
Item 8. Identification and Classification of Members of the Group:
Not Applicable
Item 9. Notice of Dissolution of Group:
Not Applicable
Item 10.Certification:
Not Applicable
(1) (1) Includes shares held through entities advised and/or managed by MPM
BioEquities Adviser LLC ("MPM BioEquities Adviser") and the general partners and
control person of such entities. MPM BioEquities Adviser is controlled by MPM
Capital II GP LLC and is the adviser of MPM BioEquities Master Fund L.P., MPM
BioEquities Investors Fund LLC, and the MPM BioEquities Fund GmbH & Co. KG, the
direct and indirect general partners of which are MPM BioEquities GP L.P. and
MPM BioEquities GP LLC. 1,631,067 of the shares are held of record by MPM
BioEquities Master Fund L.P., 8,100 of the shares are held of record by MPM
BioEquities Fund Investors LLC, and 13,733 of the shares are held of record by
MPM BioEquities Fund GmbH & Co. KG. Each reporting person herein disclaims
beneficial ownership of shares not directly held by such person.
Signature
After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.
Dated: February 14, 2003
MPM BIOEQUITIES ADVISER LLC MPM BIOEQUITIES GP LLC
By: /s/ Luke B. Evnin By: /s/ Luke B. Evnin
-------------------------------- -----------------------------------
Name: Luke B. Evnin Name: Luke B. Evnin
Title: Manager Title: Manager
MPM BIOEQUITIES MASTER FUND L.P.
MPM CAPITAL II GP LLC
By: MPM BIOEQUITIES GP L.P.,
its General Partner
By: /s/ Luke B. Evnin By: /s/ Luke B. Evnin
-------------------------------- -----------------------------------
Name: Luke B. Evnin Name: Luke B. Evnin
Title: Manager Title: Manager
MPM BIOEQUITIES GP L.P. MPM BIOVENTURES I LP
By: MPM BIOEQUITIES GP LLC, By: MPM BioVentures I LLC,
its General Partner its General Partner
By: /s/ Luke B. Evnin By: /s/ Luke B. Evnin
-------------------------------- -----------------------------------
Name: Luke B. Evnin Name: Luke B. Evnin
Title: Manager Title: Manager
MPM BIOEQUITIES INVESTORS LLC MPM BIOEQUTIES FUND GMBH & CO. KG
By: MPM BioEquities Investors LLC By: MPM BioEquities Fund GmbH & Co. KG,
its General Partner
By: /s/ Luke B. Evnin By: /s/ Luke B. Evnin
-------------------------------- -----------------------------------
Name: Luke B. Evnin Name: Luke B. Evnin
Title: Manager Title: Manager