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MASI

Masimo
MASI

Delisted

MASI was delisted on the 9th of June, 2026.

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201 hedge funds and large institutions have $1.59B invested in Masimo in 2015 Q2 according to their latest regulatory filings, with 42 funds opening new positions, 55 increasing their positions, 75 reducing their positions, and 15 closing their positions.

New
Increased
Maintained
Reduced
Closed

180% more first-time investments, than exits

New positions opened: 42 | Existing positions closed: 15

92% more call options, than puts

Call options by funds: $2.63M | Put options by funds: $1.37M

14% more funds holding

Funds holding: 176 → 201 (+25)

13% more capital invested

Capital invested by funds: $1.4B → $1.59B (+$181M)

0% more funds holding in top 10

Funds holding in top 10: 3 → 3 (0)

27% less repeat investments, than reductions

Existing positions increased: 55 | Existing positions reduced: 75

Holders
201
Holders Change
+25
Holders Change %
+14.2%
% of All Funds
5.41%
Holding in Top 10
3
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.08%
New
42
Increased
55
Reduced
75
Closed
15
Calls
$2.63M
Puts
$1.37M
Net Calls
+$1.26M
Net Calls Change
+$2.26M

Top Buyers

Rank Fund Capital Flow
1
BTW
Boston Trust Walden
Massachusetts
+$26.8M
2
CCM
Century Capital Management
Massachusetts
+$21.5M
3
NAP
New Amsterdam Partners
New York
+$8.7M
4
Arrowstreet Capital
Arrowstreet Capital
Massachusetts
+$3.87M
5
D.E. Shaw & Co
D.E. Shaw & Co
New York
+$3.8M

Top Sellers

Rank Fund Capital Flow
1
CCM
Camber Capital Management
Massachusetts
-$28.7M
2
CIP
Chartwell Investment Partners
Pennsylvania
-$21.2M
3
JHIU
Janus Henderson Investors US
Colorado
-$21.1M
4
Westfield Capital Management
Westfield Capital Management
Massachusetts
-$14.4M
5
Millennium Management
Millennium Management
New York
-$8.15M
Name Holding Trade Value Shares
Change 		Change in
Stake
CS
76
Credit Suisse
Switzerland
$2.33M +$1.08M +30,173 +101%
Swiss National Bank
77
Swiss National Bank
Switzerland
$2.32M +$43K +1,200 +2%
JP Morgan Chase
78
JP Morgan Chase
New York
$2.2M -$5.29M -147,720 -72%
Los Angeles Capital Management
79
Los Angeles Capital Management
California
$2.15M – – –
GC
80
Guggenheim Capital
Illinois
$2.02M +$1.86M +52,044 New
RFC
81
Russell Frank Company
Washington
$1.96M +$1.72M +47,921 +1,782%
MIG
82
Mariner Investment Group
New York
$1.94M – – –
RhumbLine Advisers
83
RhumbLine Advisers
Massachusetts
$1.92M -$125K -3,500 -7%
PP
84
PDT Partners
New York
$1.82M – – –
DCM
85
DAFNA Capital Management
California
$1.78M -$716K -19,990 -30%
State Board of Administration of Florida Retirement System
86
State Board of Administration of Florida Retirement System
Florida
$1.63M -$209K -5,832 -12%
VRS
87
Virginia Retirement Systems
Virginia
$1.59M – – –
TPSF
88
Texas Permanent School Fund
Texas
$1.57M -$95.6K -2,668 -6%
State of Tennessee, Department of Treasury
89
State of Tennessee, Department of Treasury
Tennessee
$1.44M – – –
BC
90
Birchview Capital
Vermont
$1.42M – – –
GC
91
Globeflex Capital
California
$1.38M -$7.17K -200 -0.6%
Grantham, Mayo, Van Otterloo & Co (GMO)
92
Grantham, Mayo, Van Otterloo & Co (GMO)
Massachusetts
$1.37M -$627K -17,500 -33%
DADC
93
D.A. Davidson & Co
Montana
$1.27M -$619K -17,285 -35%
MLICM
94
Metropolitan Life Insurance Company (MetLife)
New York
$1.25M -$59.8K -1,670 -5%
AIG
95
American International Group
New York
$1.22M -$89.2K -2,490 -7%
NCCM
96
Nine Chapters Capital Management
New Jersey
$1.2M -$258K -7,200 -19%
SO
97
STRS Ohio
Ohio
$1.15M +$387K +10,800 +57%
CC
98
Curian Capital
Colorado
$1.12M +$99.7K +2,783 +11%
CIA
99
Capital Impact Advisors
Massachusetts
$1.07M – – –
AQR Capital Management
100
AQR Capital Management
Connecticut
$1.03M +$367K +10,247 +63%
2 3
4
5 6

MASI Hedge Fund Activity: Q2 2015 in Review

201 of the 3,713 institutional investors tracked by Wall St. Rank reported a position in Masimo (MASI) for Q2 2015, worth a combined $1.59B — up 13% from $1.4B a quarter earlier.

Buyers outnumbered sellers: 42 funds opened new MASI positions and 15 closed out — a net gain of 27 holders — while 55 added to existing stakes and 75 trimmed.

The largest buyer was Boston Trust Walden, opening a new position worth an estimated $26.8M. The largest seller was Camber Capital Management, cutting an estimated $28.7M.

  • 201 institutional investors held Masimo (MASI) as of Q2 2015, up from 176 in Q1 2015.
  • Funds reported $1.59B of Masimo stock for Q2 2015, up 13% quarter-over-quarter.
  • 42 funds opened new Masimo positions in Q2 2015 and 15 closed out, a net change of +27 holders.
  • The largest Masimo buyer in Q2 2015 was Boston Trust Walden, an estimated $26.8M added.
  • The largest Masimo seller in Q2 2015 was Camber Capital Management, an estimated $28.7M sold.

Based on aggregated 13F filings for Q2 2015.