Masimo
MASI
MASI was delisted on the 9th of June, 2026.
342 hedge funds and large institutions have $5.96B invested in Masimo in 2023 Q4 according to their latest regulatory filings, with 64 funds opening new positions, 111 increasing their positions, 121 reducing their positions, and 73 closing their positions.
150% more call options, than puts
Call options by funds: $133M | Put options by funds: $53M
43% more capital invested
Capital invested by funds: $4.18B → $5.96B (+$1.78B)
25% more funds holding in top 10
Funds holding in top 10: 4 → 5 (+1)
6% more ownership
Funds ownership: 90.23% → 96.22% (+6%)
8% less repeat investments, than reductions
Existing positions increased: 111 | Existing positions reduced: 121
4% less funds holding
Funds holding: 356 → 342 (-14)
12% less first-time investments, than exits
New positions opened: 64 | Existing positions closed: 73
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fidelity Investments
Boston,
Massachusetts
|
+$157M |
| 2 |
FCM
Farallon Capital Management
San Francisco,
California
|
+$101M |
| 3 |
Thrivent Financial for Lutherans
Minneapolis,
Minnesota
|
+$97.7M |
| 4 |
Alyeska Investment Group
Chicago,
Illinois
|
+$49.8M |
| 5 |
Citadel Advisors
Miami,
Florida
|
+$47.3M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
EC
Eminence Capital
New York
|
-$90.9M |
| 2 |
SHCM
Sachem Head Capital Management
New York
|
-$55.6M |
| 3 |
MC
Martin Currie
Edinburgh,
United Kingdom
|
-$45.8M |
| 4 |
HI
HBK Investments
Dallas,
Texas
|
-$27.5M |
| 5 |
BNP Paribas Asset Management
Paris,
France
|
-$23.1M |
MASI Hedge Fund Activity: Q4 2023 in Review
342 of the 6,860 institutional investors tracked by Wall St. Rank reported a position in Masimo (MASI) for Q4 2023, worth a combined $5.96B — up 43% from $4.18B a quarter earlier.
Sellers outnumbered buyers: 73 funds closed out of MASI and 64 opened new positions — a net loss of 9 holders — while 121 trimmed existing stakes and 111 added.
The largest buyer was Fidelity Investments, adding an estimated $157M. The largest seller was Eminence Capital, exiting entirely with an estimated $90.9M sold.
- 342 institutional investors held Masimo (MASI) as of Q4 2023, down from 356 in Q3 2023.
- Funds reported $5.96B of Masimo stock for Q4 2023, up 43% quarter-over-quarter.
- 64 funds opened new Masimo positions in Q4 2023 and 73 closed out, a net change of -9 holders.
- The largest Masimo buyer in Q4 2023 was Fidelity Investments, an estimated $157M added.
- The largest Masimo seller in Q4 2023 was Eminence Capital, an estimated $90.9M sold.
Based on aggregated 13F filings for Q4 2023.