Masimo
MASI
MASI was delisted on the 9th of June, 2026.
478 hedge funds and large institutions have $10.3B invested in Masimo in 2021 Q1 according to their latest regulatory filings, with 55 funds opening new positions, 186 increasing their positions, 164 reducing their positions, and 62 closing their positions.
72% more call options, than puts
Call options by funds: $44.9M | Put options by funds: $26.1M
13% more repeat investments, than reductions
Existing positions increased: 186 | Existing positions reduced: 164
2% less funds holding
Funds holding: 489 → 478 (-11)
2.29% less ownership
Funds ownership: 83.84% → 81.55% (-2.3%)
11% less first-time investments, than exits
New positions opened: 55 | Existing positions closed: 62
17% less capital invested
Capital invested by funds: $12.4B → $10.3B (-$2.06B)
50% less funds holding in top 10
Funds holding in top 10: 6 → 3 (-3)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
VNIM
Vaughan Nelson Investment Management
Houston,
Texas
|
+$43.7M |
| 2 |
CS
Credit Suisse
Zurich,
Switzerland
|
+$39.6M |
| 3 |
OCBV
Ownership Capital B.V.
Amsterdam,
Netherlands
|
+$39.5M |
| 4 |
CIP
Champlain Investment Partners
Burlington,
Vermont
|
+$33.8M |
| 5 |
Neuberger Berman Group
New York
|
+$32.7M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fidelity Investments
Boston,
Massachusetts
|
-$356M |
| 2 |
Victory Capital Management
San Antonio,
Texas
|
-$75.3M |
| 3 |
BlackRock
New York
|
-$40.6M |
| 4 |
PAM
Panagora Asset Management
Boston,
Massachusetts
|
-$24.4M |
| 5 |
Ameriprise
Minneapolis,
Minnesota
|
-$23.2M |
MASI Hedge Fund Activity: Q1 2021 in Review
478 of the 5,696 institutional investors tracked by Wall St. Rank reported a position in Masimo (MASI) for Q1 2021, worth a combined $10.3B — down 17% from $12.4B a quarter earlier.
Sellers outnumbered buyers: 62 funds closed out of MASI and 55 opened new positions — a net loss of 7 holders — while 164 trimmed existing stakes and 186 added.
The largest buyer was Vaughan Nelson Investment Management, adding an estimated $43.7M. The largest seller was Fidelity Investments, cutting an estimated $356M.
- 478 institutional investors held Masimo (MASI) as of Q1 2021, down from 489 in Q4 2020.
- Funds reported $10.3B of Masimo stock for Q1 2021, down 17% quarter-over-quarter.
- 55 funds opened new Masimo positions in Q1 2021 and 62 closed out, a net change of -7 holders.
- The largest Masimo buyer in Q1 2021 was Vaughan Nelson Investment Management, an estimated $43.7M added.
- The largest Masimo seller in Q1 2021 was Fidelity Investments, an estimated $356M sold.
Based on aggregated 13F filings for Q1 2021.