Masimo
MASI
MASI was delisted on the 9th of June, 2026.
382 hedge funds and large institutions have $7.16B invested in Masimo in 2019 Q4 according to their latest regulatory filings, with 45 funds opening new positions, 128 increasing their positions, 143 reducing their positions, and 48 closing their positions.
8% more capital invested
Capital invested by funds: $6.63B → $7.16B (+$527M)
1.33% more ownership
Funds ownership: 83.62% → 84.95% (+1.3%)
2% less call options, than puts
Call options by funds: $7.54M | Put options by funds: $7.69M
6% less first-time investments, than exits
New positions opened: 45 | Existing positions closed: 48
3% less funds holding
Funds holding: 392 → 382 (-10)
10% less repeat investments, than reductions
Existing positions increased: 128 | Existing positions reduced: 143
75% less funds holding in top 10
Funds holding in top 10: 4 → 1 (-3)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Citigroup
New York
|
+$144M |
| 2 |
Fidelity Investments
Boston,
Massachusetts
|
+$66.5M |
| 3 |
Massachusetts Financial Services
Boston,
Massachusetts
|
+$39.5M |
| 4 |
Westfield Capital Management
Boston,
Massachusetts
|
+$32.2M |
| 5 |
Bank of Montreal
Toronto,
Ontario, Canada
|
+$30M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BlackRock
New York
|
-$51.1M |
| 2 |
Deutsche Bank
Frankfurt Am Main Ge,
Germany
|
-$23.6M |
| 3 |
Prudential Financial
Newark,
New Jersey
|
-$22.5M |
| 4 |
AQR Capital Management
Greenwich,
Connecticut
|
-$20.8M |
| 5 |
T. Rowe Price Associates
Baltimore,
Maryland
|
-$17.7M |
MASI Hedge Fund Activity: Q4 2019 in Review
382 of the 5,076 institutional investors tracked by Wall St. Rank reported a position in Masimo (MASI) for Q4 2019, worth a combined $7.16B — up 8% from $6.63B a quarter earlier.
Sellers outnumbered buyers: 48 funds closed out of MASI and 45 opened new positions — a net loss of 3 holders — while 143 trimmed existing stakes and 128 added.
The largest buyer was Citigroup, adding an estimated $144M. The largest seller was BlackRock, cutting an estimated $51.1M.
- 382 institutional investors held Masimo (MASI) as of Q4 2019, down from 392 in Q3 2019.
- Funds reported $7.16B of Masimo stock for Q4 2019, up 8% quarter-over-quarter.
- 45 funds opened new Masimo positions in Q4 2019 and 48 closed out, a net change of -3 holders.
- The largest Masimo buyer in Q4 2019 was Citigroup, an estimated $144M added.
- The largest Masimo seller in Q4 2019 was BlackRock, an estimated $51.1M sold.
Based on aggregated 13F filings for Q4 2019.