Masimo
MASI
MASI was delisted on the 9th of June, 2026.
519 hedge funds and large institutions have $13.5B invested in Masimo in 2021 Q4 according to their latest regulatory filings, with 95 funds opening new positions, 182 increasing their positions, 156 reducing their positions, and 41 closing their positions.
258% more call options, than puts
Call options by funds: $58.3M | Put options by funds: $16.3M
132% more first-time investments, than exits
New positions opened: 95 | Existing positions closed: 41
29% more funds holding in top 10
Funds holding in top 10: 7 → 9 (+2)
17% more repeat investments, than reductions
Existing positions increased: 182 | Existing positions reduced: 156
10% more funds holding
Funds holding: 472 → 519 (+47)
8% more capital invested
Capital invested by funds: $12.5B → $13.5B (+$1.03B)
0.06% less ownership
Funds ownership: 84.08% → 84.02% (-0.06%)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Millennium Management
New York
|
+$61.4M |
| 2 |
Invesco
Atlanta,
Georgia
|
+$42.5M |
| 3 |
BlackRock
New York
|
+$37.9M |
| 4 |
Wellington Management Group
Boston,
Massachusetts
|
+$33.7M |
| 5 |
Two Sigma Advisers
New York
|
+$29.1M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Ameriprise
Minneapolis,
Minnesota
|
-$66M |
| 2 |
Victory Capital Management
San Antonio,
Texas
|
-$62.4M |
| 3 |
CS
Credit Suisse
Zurich,
Switzerland
|
-$42M |
| 4 |
CIP
Champlain Investment Partners
Burlington,
Vermont
|
-$33.8M |
| 5 |
BNP Paribas Asset Management
Paris,
France
|
-$29.3M |
MASI Hedge Fund Activity: Q4 2021 in Review
519 of the 6,499 institutional investors tracked by Wall St. Rank reported a position in Masimo (MASI) for Q4 2021, worth a combined $13.5B — up 8.2% from $12.5B a quarter earlier.
Buyers outnumbered sellers: 95 funds opened new MASI positions and 41 closed out — a net gain of 54 holders — while 182 added to existing stakes and 156 trimmed.
The largest buyer was Millennium Management, adding an estimated $61.4M. The largest seller was Ameriprise, cutting an estimated $66M.
- 519 institutional investors held Masimo (MASI) as of Q4 2021, up from 472 in Q3 2021.
- Funds reported $13.5B of Masimo stock for Q4 2021, up 8.2% quarter-over-quarter.
- 95 funds opened new Masimo positions in Q4 2021 and 41 closed out, a net change of +54 holders.
- The largest Masimo buyer in Q4 2021 was Millennium Management, an estimated $61.4M added.
- The largest Masimo seller in Q4 2021 was Ameriprise, an estimated $66M sold.
Based on aggregated 13F filings for Q4 2021.