Masimo
MASI
MASI was delisted on the 9th of June, 2026.
415 hedge funds and large institutions have $7.56B invested in Masimo in 2023 Q2 according to their latest regulatory filings, with 46 funds opening new positions, 114 increasing their positions, 171 reducing their positions, and 58 closing their positions.
386% more call options, than puts
Call options by funds: $31.2M | Put options by funds: $6.42M
1.52% more ownership
Funds ownership: 85.54% → 87.06% (+1.5%)
3% less funds holding
Funds holding: 427 → 415 (-12)
9% less capital invested
Capital invested by funds: $8.3B → $7.56B (-$738M)
21% less first-time investments, than exits
New positions opened: 46 | Existing positions closed: 58
33% less repeat investments, than reductions
Existing positions increased: 114 | Existing positions reduced: 171
45% less funds holding in top 10
Funds holding in top 10: 11 → 6 (-5)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fidelity Investments
Boston,
Massachusetts
|
+$187M |
| 2 |
Westfield Capital Management
Boston,
Massachusetts
|
+$166M |
| 3 |
Vanguard Group
Malvern,
Pennsylvania
|
+$31.8M |
| 4 |
BlackRock
New York
|
+$31M |
| 5 |
First Trust Advisors
Wheaton,
Illinois
|
+$23.7M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
FCM
Farallon Capital Management
San Francisco,
California
|
-$46M |
| 2 |
Millennium Management
New York
|
-$30.7M |
| 3 |
D.E. Shaw & Co
New York
|
-$25.7M |
| 4 |
Alyeska Investment Group
Chicago,
Illinois
|
-$20.7M |
| 5 |
Citadel Advisors
Miami,
Florida
|
-$20.3M |
MASI Hedge Fund Activity: Q2 2023 in Review
415 of the 6,370 institutional investors tracked by Wall St. Rank reported a position in Masimo (MASI) for Q2 2023, worth a combined $7.56B — down 8.9% from $8.3B a quarter earlier.
Sellers outnumbered buyers: 58 funds closed out of MASI and 46 opened new positions — a net loss of 12 holders — while 171 trimmed existing stakes and 114 added.
The largest buyer was Fidelity Investments, adding an estimated $187M. The largest seller was Farallon Capital Management, cutting an estimated $46M.
- 415 institutional investors held Masimo (MASI) as of Q2 2023, down from 427 in Q1 2023.
- Funds reported $7.56B of Masimo stock for Q2 2023, down 8.9% quarter-over-quarter.
- 46 funds opened new Masimo positions in Q2 2023 and 58 closed out, a net change of -12 holders.
- The largest Masimo buyer in Q2 2023 was Fidelity Investments, an estimated $187M added.
- The largest Masimo seller in Q2 2023 was Farallon Capital Management, an estimated $46M sold.
Based on aggregated 13F filings for Q2 2023.