Masimo
MASI
MASI was delisted on the 9th of June, 2026.
456 hedge funds and large institutions have $11.1B invested in Masimo in 2021 Q2 according to their latest regulatory filings, with 45 funds opening new positions, 164 increasing their positions, 172 reducing their positions, and 65 closing their positions.
318% more call options, than puts
Call options by funds: $93.5M | Put options by funds: $22.4M
33% more funds holding in top 10
Funds holding in top 10: 3 → 4 (+1)
7% more capital invested
Capital invested by funds: $10.3B → $11.1B (+$753M)
1.74% more ownership
Funds ownership: 81.55% → 83.29% (+1.7%)
5% less repeat investments, than reductions
Existing positions increased: 164 | Existing positions reduced: 172
5% less funds holding
Funds holding: 478 → 456 (-22)
31% less first-time investments, than exits
New positions opened: 45 | Existing positions closed: 65
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BlackRock
New York
|
+$174M |
| 2 |
Macquarie Group
Sydney, NSW 2000,
Australia
|
+$129M |
| 3 |
Korea Investment Corp
Seoul,
South Korea
|
+$61.1M |
| 4 |
RI
RTW Investments
New York
|
+$52.8M |
| 5 |
VNIM
Vaughan Nelson Investment Management
Houston,
Texas
|
+$45.2M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Invesco
Atlanta,
Georgia
|
-$77.3M |
| 2 |
Fidelity Investments
Boston,
Massachusetts
|
-$75.4M |
| 3 |
Westfield Capital Management
Boston,
Massachusetts
|
-$47.7M |
| 4 |
FAM
Fred Alger Management
New York
|
-$40.4M |
| 5 |
Massachusetts Financial Services
Boston,
Massachusetts
|
-$33.4M |
MASI Hedge Fund Activity: Q2 2021 in Review
456 of the 5,746 institutional investors tracked by Wall St. Rank reported a position in Masimo (MASI) for Q2 2021, worth a combined $11.1B — up 7.3% from $10.3B a quarter earlier.
Sellers outnumbered buyers: 65 funds closed out of MASI and 45 opened new positions — a net loss of 20 holders — while 172 trimmed existing stakes and 164 added.
The largest buyer was BlackRock, adding an estimated $174M. The largest seller was Invesco, cutting an estimated $77.3M.
- 456 institutional investors held Masimo (MASI) as of Q2 2021, down from 478 in Q1 2021.
- Funds reported $11.1B of Masimo stock for Q2 2021, up 7.3% quarter-over-quarter.
- 45 funds opened new Masimo positions in Q2 2021 and 65 closed out, a net change of -20 holders.
- The largest Masimo buyer in Q2 2021 was BlackRock, an estimated $174M added.
- The largest Masimo seller in Q2 2021 was Invesco, an estimated $77.3M sold.
Based on aggregated 13F filings for Q2 2021.