Masimo
MASI
MASI was delisted on the 9th of June, 2026.
353 hedge funds and large institutions have $5.53B invested in Masimo in 2018 Q3 according to their latest regulatory filings, with 49 funds opening new positions, 98 increasing their positions, 157 reducing their positions, and 32 closing their positions.
100% more funds holding in top 10
Funds holding in top 10: 2 → 4 (+2)
53% more first-time investments, than exits
New positions opened: 49 | Existing positions closed: 32
30% more capital invested
Capital invested by funds: $4.26B → $5.53B (+$1.27B)
4% more funds holding
Funds holding: 339 → 353 (+14)
0.75% more ownership
Funds ownership: 84.38% → 85.13% (+0.75%)
26% less call options, than puts
Call options by funds: $6.55M | Put options by funds: $8.83M
38% less repeat investments, than reductions
Existing positions increased: 98 | Existing positions reduced: 157
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BlackRock
New York
|
+$173M |
| 2 |
Fidelity Investments
Boston,
Massachusetts
|
+$164M |
| 3 |
American Century Companies
Kansas City,
Missouri
|
+$85.2M |
| 4 |
Marshall Wace
London,
United Kingdom
|
+$40.9M |
| 5 |
OCBV
Ownership Capital B.V.
Amsterdam,
Netherlands
|
+$35M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
HM
HealthCor Management
New York
|
-$72.9M |
| 2 |
Point72 Asset Management
Stamford,
Connecticut
|
-$68.7M |
| 3 |
MWNA
Marshall Wace North America
New York
|
-$63.8M |
| 4 |
Westfield Capital Management
Boston,
Massachusetts
|
-$41.3M |
| 5 |
Ameriprise
Minneapolis,
Minnesota
|
-$34.6M |
MASI Hedge Fund Activity: Q3 2018 in Review
353 of the 4,375 institutional investors tracked by Wall St. Rank reported a position in Masimo (MASI) for Q3 2018, worth a combined $5.53B — up 30% from $4.26B a quarter earlier.
Buyers outnumbered sellers: 49 funds opened new MASI positions and 32 closed out — a net gain of 17 holders — while 98 added to existing stakes and 157 trimmed.
The largest buyer was BlackRock, adding an estimated $173M. The largest seller was HealthCor Management, exiting entirely with an estimated $72.9M sold.
- 353 institutional investors held Masimo (MASI) as of Q3 2018, up from 339 in Q2 2018.
- Funds reported $5.53B of Masimo stock for Q3 2018, up 30% quarter-over-quarter.
- 49 funds opened new Masimo positions in Q3 2018 and 32 closed out, a net change of +17 holders.
- The largest Masimo buyer in Q3 2018 was BlackRock, an estimated $173M added.
- The largest Masimo seller in Q3 2018 was HealthCor Management, an estimated $72.9M sold.
Based on aggregated 13F filings for Q3 2018.