SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
----------------
SCHEDULE 13G
(Rule 13d-102)
----------------
INFORMATION TO BE INCLUDED IN STATEMENTS PURSUANT TO RULES 13d-1(b), (c)
AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2 UNDER THE
SECURITIES EXCHANGE ACT OF 1934
MASIMO CORPORATION
(Name of Issuer)
COMMON STOCK, PAR VALUE $0.001
(Title of Class of Securities)
574795100
(CUSIP Number)
January 7, 2008
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:
[ ] Rule 13d-1(b)
[X] Rule 13d-1(c)
[ ] Rule 13d-1(d)
-----------
* The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form 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).
Schedule 13G
CUSIP No. 574795100 PAGE 2 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Davidson Kempner Partners
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
New York
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
116,501
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
116,501
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
116,501
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
0.2%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
PN
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 3 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Davidson Kempner Institutional Partners, L.P.
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
222,045
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
222,045
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
222,045
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
0.4%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
PN
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 4 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
M.H. Davidson & Co.
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
New York
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
12,117
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
12,117
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
12,117
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
0.0%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
PN
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 5 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Davidson Kempner International, Ltd.
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
British Virgin Islands
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
365,580
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
365,580
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
365,580
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
0.7%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
CO
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 6 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Serena Limited
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
Cayman Islands
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
6,535
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
6,535
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
6,535
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
0.0%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
CO
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 7 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Davidson Kempner Healthcare Fund LP
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
805,583
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
805,583
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
805,583
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
1.5%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
PN
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 8 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Davidson Kempner Healthcare International Ltd.
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
Cayman Islands
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
1,216,278
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
1,216,278
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
1,216,278
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
2.2%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
CO
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 9 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
MHD Management Co.
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
New York
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
116,501
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
116,501
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
116,501
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
0.2%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
PN
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 10 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Davidson Kempner Advisers Inc.
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
New York
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
222,045
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
222,045
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
222,045
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
0.4%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
IA
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 11 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Davidson Kempner International Advisors, L.L.C.
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
372,115
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
372,115
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
372,115
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
0.7%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
OO
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 12 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
DK Group LLC
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
805,583
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
805,583
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
805,583
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
1.5%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
OO
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 13 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
DK Mangement Partners LP
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
1,216,278
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
1,216,278
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
1,216,278
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
2.2%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
PN
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 14 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
DK Stillwater GP LLC
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
1,216,278
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
1,216,278
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
1,216,278
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
2.2%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
OO
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 15 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Thomas L. Kempner, Jr.
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
United States
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
2,744,639
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
2,744,639
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
2,744,639
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
5.0%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
IN
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 16 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Marvin H. Davidson
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
United States
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
2,744,639
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
2,744,639
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
2,744,639
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
5.0%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
IN
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 17 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Stephen M. Dowicz
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
United States
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
2,744,639
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
2,744,639
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
2,744,639
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
5.0%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
IN
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 18 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Scott E. Davidson
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
United States
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
2,744,639
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
2,744,639
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
2,744,639
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
5.0%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
IN
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 19 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Michael J. Leffell
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
United States
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
2,744,639
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
2,744,639
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
2,744,639
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
5.0%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
IN
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 20 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Timothy I. Levart
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
United Kingdom & United States
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
2,744,639
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
2,744,639
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
2,744,639
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
5.0%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
IN
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 21 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Robert J. Brivio, Jr.
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
United Sates
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
2,744,639
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
2,744,639
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
2,744,639
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
5.0%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
IN
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 22 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Eric P. Epstein
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
United States
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
2,744,639
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
2,744,639
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
2,744,639
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
5.0%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
IN
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 23 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Anthony A. Yoseloff
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
New York
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
2,744,639
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
2,744,639
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
2,744,639
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
5.0%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
IN
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 24 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Avram Z. Friedman
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
United States
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
2,744,639
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
2,744,639
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
2,744,639
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
5.0%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
IN
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 25 OF 43
------------------------------------------------------------------------------
(1) NAME OF REPORTING PERSON
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
Conor Bastable
------------------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(a) [ ]
(b) [X]
------------------------------------------------------------------------------
(3) SEC USE ONLY
------------------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
United States
------------------------------------------------------------------------------
NUMBER OF (5) SOLE VOTING POWER
0
SHARES ------------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
2,744,639
OWNED BY ------------------------------------------------------------
EACH (7) SOLE DISPOSITIVE POWER
0
REPORTING ------------------------------------------------------------
PERSON WITH (8) SHARED DISPOSITIVE POWER
2,744,639
------------------------------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED
BY EACH REPORTING PERSON
2,744,639
------------------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT
IN ROW (9) EXCLUDES CERTAIN SHARES [ ]
------------------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED
BY AMOUNT IN ROW (9)
5.0%
------------------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON
IN
------------------------------------------------------------------------------
Schedule 13G
CUSIP No. 574795100 PAGE 26 OF 43
------------------------------------------------------------------------------
ITEM 1(a). NAME OF ISSUER:
Masimo Corporation. (the "Company")
ITEM 1(b). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
40 Parker
Irvine, California 92618
ITEM 2(a). NAME OF PERSON FILING:
This Statement is filed by each of the entities and persons listed below,
all of whom together are referred to herein as the "Reporting Persons":
(i) Davidson Kempner Partners, a New York limited partnership
("DKP");
(ii) Davidson Kempner Institutional Partners, L.P., a Delaware
limited partnership ("DKIP");
(iii) M. H. Davidson & Co., a New York limited partnership ("CO");
(iv) Davidson Kempner International, Ltd., a British Virgin
Islands corporation ("DKIL");
(v) Serena Limited, a Cayman Islands corporation ("Serena");
(vi) Davidson Kempner Healthcare Fund LP, a Delaware limited
partnership ("DKHF");
(vii) Davidson Kempner Healthcare International Ltd., a Cayman
Islands corporation ("DKHI");
(viii) MHD Management Co., a New York limited partnership and the
general partner of DKP ("MHD");
(ix) Davidson Kempner Advisers Inc., a New York corporation and
the general partner of DKIP ("DKAI"), which is registered as
an investment adviser with the U.S. Securities and Exchange
Commission;
(x) Davidson Kempner International Advisors, L.L.C., a Delaware
limited liability company and the manager of DKIL and Serena
("DKIA");
(xi) DK Group LLC, a Delaware limited liability company and the
general partner of DKHF ("DKG");
(xii) DK Management Partners LP, a Delaware limited partnership
and the investment manager of DKHI ("DKMP");
Schedule 13G
CUSIP No. 574795100 PAGE 27 OF 43
(xiii) DK Stillwater GP LLC, a Delaware limited liability company
and the general partner of DKMP ("DKS"); and
(xiv) Messrs. Thomas L. Kempner, Jr., Marvin H. Davidson, Stephen
M. Dowicz, Scott E. Davidson, Michael J. Leffell, Timothy I.
Levart, Robert J. Brivio, Jr., Anthony A. Yoseloff, Eric P.
Epstein, Avram Z. Friedman and Conor Bastable (collectively,
the "Principals"), who are the general partners of CO and
MHD, the sole managing members of DKIA and DKG and the sole
stockholders of DKAI. Messrs. Thomas L. Kempner, Jr. and
Timothy I. Levart are Executive Managing Member and Deputy
Executive Managing Member, respectively, of DKS. Each of
Messrs. Kempner and Levart, together with Messrs. Marvin H.
Davidson, Stephen M. Dowicz, Scott E. Davidson, Michael J.
Leffell, Robert J. Brivio, Jr., Anthony A. Yoseloff, Eric P.
Epstein, Avram Z. Friedman and Conor Bastable are limited
partners of DKMP.
ITEM 2(b). ADDRESS OF PRINCIPAL BUSINESS OFFICE:
The address of the principal business office of each of the Reporting
Persons is c/o Davidson Kempner Partners, 65 East 55th Street, 19th Floor, New
York, New York 10022.
ITEM 2(c). CITIZENSHIP:
(i) DKP - a New York limited partnership
(ii) DKIP - a Delaware limited partnership
(iii) CO - a New York limited partnership
(iv) DKIL - a British Virgin Islands corporation
(v) Serena - a Cayman Islands corporation
(vi) DKHF - a Delaware limited partnership
(vii) DKHI - a Cayman Islands corporation
(viii) MHD - a New York limited partnership
(ix) DKAI - a New York corporation
(x) DKIA - a Delaware limited liability company
(xi) DKG - a Delaware limited liability company
(xii) DKMP - a Delaware limited partnership
Schedule 13G
CUSIP No. 574795100 PAGE 28 OF 43
(xiii) DKS - a Delaware limited liability company
(xiv) Thomas L. Kempner, Jr. - United States
(xv) Marvin H. Davidson - United States
(xvi) Stephen M. Dowicz - United States
(xvii) Scott E. Davidson -United States
(xviii) Michael J. Leffell - United States
(xix) Timothy I. Levart - United Kingdom & United States
(xx) Robert J. Brivio, Jr. - United States
(xxi) Eric P. Epstein - United States
(xxii) Anthony A. Yoseloff - United States
(xxiii) Avram Z. Friedman - United States
(xxiv) Conor Bastable - United States
ITEM 2(d). TITLE OF CLASS OF SECURITIES:
COMMON STOCK, PAR VALUE $0.001
ITEM 2(e). CUSIP NUMBER:
574795100
ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO 13d-1(b) OR 13d-2(b) OR (c),
CHECK WHETHER THE PERSON FILING IS A:
(a) [ ] Broker or dealer registered under Section 15 of the Act;
(b) [ ] Bank as defined in Section 3(a)(6) of the Act;
(c) [ ] Insurance Company as defined in Section 3(a)(19) of the Act;
(d) [ ] Investment Company registered under Section 8 of the
Investment Company Act of 1940;
(e) [ ] Investment Adviser registered under Section 203 of the
Investment Advisers Act of 1940: see Rule
13d-1(b)(1)(ii)(E);
(f) [ ] Employee Benefit Plan, Pension Fund which is subject to the
provisions of the Employee Retirement Income Security Act of
1974 or Endowment Fund; see Rule 13d-1(b)(1)(ii)(F);
Schedule 13G
CUSIP No. 574795100 PAGE 29 OF 43
(g) [ ] Parent Holding Company, in accordance with Rule
13d-1(b)(ii)(G);
(h) [ ] Savings Associations as defined in Section 3(b) of the
Federal Deposit Insurance Act;
(i) [ ] Church Plan that is excluded from the definition of an
investment company under Section 3(c)(14) of the Investment
Company Act of 1940;
(j) [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J).
ITEM 4. OWNERSHIP.
The Principals may be deemed to beneficially own an aggregate 2,744,639
shares as a result of their voting and dispositive power over the 2,744,639
shares beneficially owned by DKP, DKIP, DKIL, Serena, CO, DKHF and DKHI.
DKIA may be deemed to beneficially own the 365,580 shares beneficially
owned by DKIL and the 6,535 shares beneficially owned by Serena as a result of
its voting and dispositive power over those shares. DKAI may be deemed to
beneficially own the 222,045 shares beneficially owned by DKIP as a result of
its voting and dispositive power over those shares. MHD may be deemed to
beneficially own the 116,501 shares beneficially owned by DKP as a result of its
voting and dispositive power over those shares. DKG may be deemed to
beneficially own the 805,583 shares beneficially owned by DKHF as a result of
its voting and dispositive power over those shares. DKMP and DKS may be deemed
to beneficially own the 1,216,278 shares beneficially owned by DKHI as a result
of their voting and dispositive power over those shares.
A. DKP
(a) Amount beneficially owned: 116,501
(b) Percent of class: 0.2%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 116,501
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition: 116,501
B. DKIP
(a) Amount beneficially owned: 222,045
(b) Percent of class: 0.4%
(c) Number of shares as to which such person has:
Schedule 13G
CUSIP No. 574795100 PAGE 30 OF 43
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 222,045
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition: 222,045
C. CO
(a) Amount beneficially owned: 12,117
(b) Percent of class: 0.0%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 12,117
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition: 12,117
D. DKIL
(a) Amount beneficially owned: 365,580
(b) Percent of class: 0.7%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 365,580
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition: 365,580
E. Serena
(a) Amount beneficially owned: 6,535
(b) Percent of class: 0.0%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 6,535
Schedule 13G
CUSIP No. 574795100 PAGE 31 OF 43
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition: 6,535
F. DKHF
(a) Amount beneficially owned: 805,583
(b) Percent of class: 1.5%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 805,583
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition: 805,583
G. DKHI
(a) Amount beneficially owned: 1,216,278
(b) Percent of class: 2.2%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 1,216,278
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition:
1,216,278
H. MHD
(a) Amount beneficially owned: 116,501
(b) Percent of class: 0.2%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 116,501
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition: 116,501
Schedule 13G
CUSIP No. 574795100 PAGE 32 OF 43
I. DKAI
(a) Amount beneficially owned: 222,045
(b) Percent of class: 0.4%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 222,045
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition: 222,045
J. DKIA
(a) Amount beneficially owned: 372,115
(b) Percent of class: 0.7%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 372,115
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition: 372,115
K. DKG
(a) Amount beneficially owned: 805,583
(b) Percent of class: 1.5%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 805,583
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition: 805,583
Schedule 13G
CUSIP No. 574795100 PAGE 33 OF 43
L. DKMP
(a) Amount beneficially owned: 1,216,278
(b) Percent of class: 2.2%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 1,216,278
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition:
1,216,278
M. DKS
(a) Amount beneficially owned: 1,216,278
(b) Percent of class: 2.2%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 1,216,278
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition:
1,216,278
N. Thomas L. Kempner, Jr.
(a) Amount beneficially owned: 2,744,639
(b) Percent of class: 5.0%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 2,744,639
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition:
2,744,639
Schedule 13G
CUSIP No. 574795100 PAGE 34 OF 43
O. Marvin H. Davidson
(a) Amount beneficially owned: 2,744,639
(b) Percent of class: 5.0%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 2,744,639
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition:
2,744,639
P. Stephen M. Dowicz
(a) Amount beneficially owned: 2,744,639
(b) Percent of class: 5.0%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 2,744,639
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition:
2,744,639
Q. Scott E. Davidson
(a) Amount beneficially owned: 2,744,639
(b) Percent of class: 5.0%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 2,744,639
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition:
2,744,639
Schedule 13G
CUSIP No. 574795100 PAGE 35 OF 43
R. Michael J. Leffell
(a) Amount beneficially owned. 2,744,639
(b) Percent of class: 5.0%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 2,744,639
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition:
2,744,639
S. Timothy I. Levart
(a) Amount beneficially owned: 2,744,639
(b) Percent of class: 5.0%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 2,744,639
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition:
2,744,639
T. Robert J. Brivio, Jr.
(a) Amount beneficially owned: 2,744,639
(b) Percent of class: 5.0%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 2,744,639
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition:
2,744,639
Schedule 13G
CUSIP No. 574795100 PAGE 36 OF 43
U. Eric P. Epstein
(a) Amount beneficially owned: 2,744,639
(b) Percent of class: 5.0%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 2,744,639
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition:
2,744,639
V. Anthony A. Yoseloff
(a) Amount beneficially owned: 2,744,639
(b) Percent of class: 5.0%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 2,744,639
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition:
2,744,639
W. Avram Z. Friedman
(a) Amount beneficially owned: 2,744,639
(b) Percent of class: 5.0%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 2,744,639
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition:
2,744,639
Y. Conor Bastable
(a) Amount beneficially owned: 2,744,639
Schedule 13G
CUSIP No. 574795100 PAGE 37 OF 43
(b) Percent of class: 5.0%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 0
(ii) shared power to vote or to direct the vote: 2,744,639
(iii) sole power to dispose or to direct the disposition: 0
(iv) shared power to dispose or to direct the disposition:
2,744,639
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.
The partners, members or stockholders of each of the Reporting Persons,
including the Principals, have the right to participate in the receipt of
dividends from, or proceeds from the sale of, the securities held for the
account of such Reporting Person in accordance with their ownership interests in
such Reporting Person. The Reporting Persons disclaim all beneficial ownership
as affiliates of a registered investment adviser, and, in any case, disclaim
beneficial ownership except as to the extent of their pecuniary interest in the
shares. The Reporting Persons have elected to file Schedule 13G although such
filing may not be required under the Act.
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.
See Item 4.
ITEM 9. NOTICE OF DISSOLUTION OF GROUP.
Not applicable.
ITEM 10. CERTIFICATION. (if filing pursuant to Rule 13d-1(c))
Each of the Reporting Persons hereby makes the following certification:
By signing below we certify that, to the best of our knowledge and belief,
the securities referred to above were not acquired and are not held for the
purpose of or with the effect of changing or influencing the control of the
issuer of the securities and were not acquired and are not held in connection
with or as a participant in any transaction having that purpose or effect.
CUSIP No. 574795100 PAGE 38 OF 43
10586190.2
SIGNATURES
After reasonable inquiry and to the best of our knowledge and belief, the
undersigned certify that the information set forth in this statement is true,
complete and correct.
DATED: January 16, 2008 DAVIDSON KEMPNER PARTNERS
By: MHD Management Co.,
its General Partner
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Managing Partner
DAVIDSON KEMPNER INSTITUTIONAL
PARTNERS, L.P.
By: Davidson Kempner Advisers Inc.,
its General Partner
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: President
M.H. DAVIDSON & CO.
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Managing Partner
DAVIDSON KEMPNER INTERNATIONAL, LTD.
By: Davidson Kempner International
Advisors, L.L.C.,
its Investment Manager
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Executive Managing Member
SERENA LIMITED
By: Davidson Kempner International
Advisors, L.L.C.,
its Investment Manager
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Executive Managing Member
Schedule 13G
CUSIP No. 574795100 PAGE 39 OF 43
DAVIDSON KEMPNER HEALTHCARE FUND LP
By: DK Group LLC,
its General Partner
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Executive Managing Member
DAVIDSON KEMPNER HEALTHCARE
INTERNATIONAL LTD.
By: DK Management Partners LP,
its Investment Manager
By: DK Stillwater GP LLC, its general
partner
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Executive Managing Member
MHD MANAGEMENT CO.
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Managing Partner
DAVIDSON KEMPNER ADVISERS INC.
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: President
DAVIDSON KEMPNER INTERNATIONAL
ADVISORS, L.L.C.
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Executive Managing Member
DK GROUP LLC
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Executive Managing Member
Schedule 13G
CUSIP No. 574795100 PAGE 40 OF 43
DK MANAGEMENT PARTNERS LP
By: DK Stillwater GP LLC, its general
partner
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Executive Managing Member
DK STILLWATER GP LLC
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Executive Managing Member
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Thomas L. Kempner, Jr.
/S/ MARVIN H. DAVIDSON
--------------------------
Marvin H. Davidson
/S/ STEPHEN M. DOWICZ
--------------------------
Stephen M. Dowicz
/S/ SCOTT E. DAVIDSON
--------------------------
Scott E. Davidson
/S/ MICHAEL J. LEFFELL
--------------------------
Michael J. Leffell
/S/ TIMOTHY I. LEVART
--------------------------
Timothy I. Levart
/S/ ROBERT J. BRIVIO, JR.
-------------------------
Robert J. Brivio, Jr.
/S/ ERIC P. EPSTEIN
--------------------------
Eric P. Epstein
/S/ ANTHONY A. YOSELOFF
--------------------------
Anthony A. Yoseloff
/S/ AVRAM Z. FRIEDMAN
--------------------------
Avram Z. Friedman
/S/ CONOR BASTABLE
--------------------------
Conor Bastable
Schedule 13G
CUSIP No. 574795100 PAGE 41 OF 43
EXHIBIT 1
JOINT ACQUISITION STATEMENT
PURSUANT TO RULE 13d-1(k)
The undersigned acknowledge and agree that the foregoing statement on
Schedule 13G is filed on behalf of each of the undersigned and that all
subsequent amendments to this statement on Schedule 13G, shall be filed on
behalf of each of the undersigned without the necessity of filing additional
joint acquisition statements. The undersigned acknowledge that each shall be
responsible for the timely filing of such amendments, and for the completeness
and accuracy of the information concerning him or it contained therein, but
shall not be responsible for the completeness and accuracy of the information
concerning the others, except to the extent that he or it knows or has reason to
believe that such information is inaccurate.
DATED: January 16, 2008 DAVIDSON KEMPNER PARTNERS
By: MHD Management Co.,
its General Partner
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Managing Partner
DAVIDSON KEMPNER INSTITUTIONAL
PARTNERS, L.P.
By: Davidson Kempner Advisers Inc.,
its General Partner
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: President
M.H. DAVIDSON & CO.
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Managing Partner
DAVIDSON KEMPNER INTERNATIONAL, LTD.
By: Davidson Kempner International
Advisors, L.L.C.,
its Investment Manager
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Executive Managing Member
Schedule 13G
CUSIP No. 574795100 PAGE 42 OF 43
SERENA LIMITED
By: Davidson Kempner International
Advisors, L.L.C.,
its Investment Manager
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Executive Managing Member
DAVIDSON KEMPNER HEALTHCARE FUND LP
By: DK Group LLC,
its General Partner
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Executive Managing Member
DAVIDSON KEMPNER HEALTHCARE
INTERNATIONAL LTD.
By: DK Management Partners LP,
its Investment Manager
By: DK Stillwater GP LLC, its general
partner
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Executive Managing Member
MHD MANAGEMENT CO.
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Managing Partner
DAVIDSON KEMPNER ADVISERS INC.
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: President
DAVIDSON KEMPNER INTERNATIONAL
ADVISORS, L.L.C.
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Executive Managing Member
Schedule 13G
CUSIP No. 574795100 PAGE 43 OF 43
DK GROUP LLC
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Executive Managing Member
DK MANAGEMENT PARTNERS LP
By: DK Stillwater GP LLC, its general
partner
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Executive Managing Member
DK STILLWATER GP LLC
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Name: Thomas L. Kempner, Jr.
Title: Executive Managing Member
/S/ THOMAS L. KEMPNER, JR.
--------------------------
Thomas L. Kempner, Jr.
/S/ MARVIN H. DAVIDSON
--------------------------
Marvin H. Davidson
/S/ STEPHEN M. DOWICZ
--------------------------
Stephen M. Dowicz
/S/ SCOTT E. DAVIDSON
--------------------------
Scott E. Davidson
/S/ MICHAEL J. LEFFELL
--------------------------
Michael J. Leffell
/S/ TIMOTHY I. LEVART
--------------------------
Timothy I. Levart
/S/ ROBERT J. BRIVIO, JR.
-------------------------
Robert J. Brivio, Jr.
/S/ ERIC P. EPSTEIN
--------------------------
Eric P. Epstein
/S/ ANTHONY A. YOSELOFF
--------------------------
Anthony A. Yoseloff
/S/ AVRAM Z. FRIEDMAN
--------------------------
Avram Z. Friedman
/S/ CONOR BASTABLE
--------------------------
Conor Bastable