Masimo
MASI
MASI was delisted on the 9th of June, 2026.
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.
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
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BTW
Boston Trust Walden
Boston,
Massachusetts
|
+$26.8M |
| 2 |
CCM
Century Capital Management
Boston,
Massachusetts
|
+$21.5M |
| 3 |
NAP
New Amsterdam Partners
New York
|
+$8.7M |
| 4 |
Arrowstreet Capital
Boston,
Massachusetts
|
+$3.87M |
| 5 |
D.E. Shaw & Co
New York
|
+$3.8M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
CCM
Camber Capital Management
Boston,
Massachusetts
|
-$28.7M |
| 2 |
CIP
Chartwell Investment Partners
Berywn,
Pennsylvania
|
-$21.2M |
| 3 |
JHIU
Janus Henderson Investors US
Denver,
Colorado
|
-$21.1M |
| 4 |
Westfield Capital Management
Boston,
Massachusetts
|
-$14.4M |
| 5 |
Millennium Management
New York
|
-$8.15M |
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.