Masimo
MASI
MASI was delisted on the 9th of June, 2026.
427 hedge funds and large institutions have $8.3B invested in Masimo in 2023 Q1 according to their latest regulatory filings, with 68 funds opening new positions, 134 increasing their positions, 143 reducing their positions, and 38 closing their positions.
140% more call options, than puts
Call options by funds: $31.6M | Put options by funds: $13.2M
120% more funds holding in top 10
Funds holding in top 10: 5 → 11 (+6)
79% more first-time investments, than exits
New positions opened: 68 | Existing positions closed: 38
27% more capital invested
Capital invested by funds: $6.54B → $8.3B (+$1.76B)
5% more funds holding
Funds holding: 405 → 427 (+22)
0.99% more ownership
Funds ownership: 84.55% → 85.54% (+0.99%)
6% less repeat investments, than reductions
Existing positions increased: 134 | Existing positions reduced: 143
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Capital Research Global Investors
Los Angeles,
California
|
+$118M |
| 2 |
Fidelity Investments
Boston,
Massachusetts
|
+$106M |
| 3 |
Millennium Management
New York
|
+$34.5M |
| 4 |
Rockefeller Capital Management
New York
|
+$24.9M |
| 5 |
Citadel Advisors
Miami,
Florida
|
+$20.8M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Goldman Sachs
New York
|
-$35.8M |
| 2 |
Vanguard Group
Malvern,
Pennsylvania
|
-$30.9M |
| 3 |
Morgan Stanley
New York
|
-$29M |
| 4 |
Canada Pension Plan Investment Board
Toronto Ontario,
Ontario, Canada
|
-$22.2M |
| 5 |
FCM
Farallon Capital Management
San Francisco,
California
|
-$21.4M |
MASI Hedge Fund Activity: Q1 2023 in Review
427 of the 6,276 institutional investors tracked by Wall St. Rank reported a position in Masimo (MASI) for Q1 2023, worth a combined $8.3B — up 27% from $6.54B a quarter earlier.
Buyers outnumbered sellers: 68 funds opened new MASI positions and 38 closed out — a net gain of 30 holders — while 134 added to existing stakes and 143 trimmed.
The largest buyer was Capital Research Global Investors, adding an estimated $118M. The largest seller was Goldman Sachs, cutting an estimated $35.8M.
- 427 institutional investors held Masimo (MASI) as of Q1 2023, up from 405 in Q4 2022.
- Funds reported $8.3B of Masimo stock for Q1 2023, up 27% quarter-over-quarter.
- 68 funds opened new Masimo positions in Q1 2023 and 38 closed out, a net change of +30 holders.
- The largest Masimo buyer in Q1 2023 was Capital Research Global Investors, an estimated $118M added.
- The largest Masimo seller in Q1 2023 was Goldman Sachs, an estimated $35.8M sold.
Based on aggregated 13F filings for Q1 2023.