Masimo
MASI
MASI was delisted on the 9th of June, 2026.
472 hedge funds and large institutions have $12.5B invested in Masimo in 2021 Q3 according to their latest regulatory filings, with 55 funds opening new positions, 148 increasing their positions, 175 reducing their positions, and 36 closing their positions.
323% more call options, than puts
Call options by funds: $65.9M | Put options by funds: $15.6M
75% more funds holding in top 10
Funds holding in top 10: 4 → 7 (+3)
53% more first-time investments, than exits
New positions opened: 55 | Existing positions closed: 36
13% more capital invested
Capital invested by funds: $11.1B → $12.5B (+$1.42B)
3% more funds holding
Funds holding: 457 → 472 (+15)
0.81% more ownership
Funds ownership: 83.28% → 84.08% (+0.81%)
15% less repeat investments, than reductions
Existing positions increased: 148 | Existing positions reduced: 175
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
DCP
D1 Capital Partners
New York
|
+$148M |
| 2 |
Wellington Management Group
Boston,
Massachusetts
|
+$74.2M |
| 3 |
Sumitomo Mitsui Trust Group
Minato-Ku, Tokyo,
Japan
|
+$52.1M |
| 4 |
Alyeska Investment Group
Chicago,
Illinois
|
+$39.7M |
| 5 |
MC
Martin Currie
Edinburgh,
United Kingdom
|
+$37.1M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
William Blair Investment Management
Chicago,
Illinois
|
-$105M |
| 2 |
Neuberger Berman Group
New York
|
-$48M |
| 3 |
EAM
Eagle Asset Management
St Petersburg,
Florida
|
-$44.4M |
| 4 |
CS
Credit Suisse
Zurich,
Switzerland
|
-$41M |
| 5 |
Citigroup
New York
|
-$32.6M |
MASI Hedge Fund Activity: Q3 2021 in Review
472 of the 5,728 institutional investors tracked by Wall St. Rank reported a position in Masimo (MASI) for Q3 2021, worth a combined $12.5B — up 13% from $11.1B a quarter earlier.
Buyers outnumbered sellers: 55 funds opened new MASI positions and 36 closed out — a net gain of 19 holders — while 148 added to existing stakes and 175 trimmed.
The largest buyer was D1 Capital Partners, opening a new position worth an estimated $148M. The largest seller was William Blair Investment Management, exiting entirely with an estimated $105M sold.
- 472 institutional investors held Masimo (MASI) as of Q3 2021, up from 457 in Q2 2021.
- Funds reported $12.5B of Masimo stock for Q3 2021, up 13% quarter-over-quarter.
- 55 funds opened new Masimo positions in Q3 2021 and 36 closed out, a net change of +19 holders.
- The largest Masimo buyer in Q3 2021 was D1 Capital Partners, an estimated $148M added.
- The largest Masimo seller in Q3 2021 was William Blair Investment Management, an estimated $105M sold.
Based on aggregated 13F filings for Q3 2021.