Masimo
MASI
MASI was delisted on the 9th of June, 2026.
365 hedge funds and large institutions have $3.98B invested in Masimo in 2017 Q1 according to their latest regulatory filings, with 87 funds opening new positions, 109 increasing their positions, 143 reducing their positions, and 28 closing their positions.
211% more first-time investments, than exits
New positions opened: 87 | Existing positions closed: 28
100% more funds holding in top 10
Funds holding in top 10: 3 → 6 (+3)
58% more call options, than puts
Call options by funds: $13.4M | Put options by funds: $8.52M
46% more capital invested
Capital invested by funds: $2.73B → $3.98B (+$1.25B)
16% more funds holding
Funds holding: 314 → 365 (+51)
3.13% more ownership
Funds ownership: 81.48% → 84.6% (+3.1%)
24% less repeat investments, than reductions
Existing positions increased: 109 | Existing positions reduced: 143
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BlackRock
New York
|
+$594M |
| 2 |
Arrowstreet Capital
Boston,
Massachusetts
|
+$88.4M |
| 3 |
Two Sigma Advisers
New York
|
+$60.8M |
| 4 |
NI
Numeric Investors
Boston,
Massachusetts
|
+$58.7M |
| 5 |
Robeco Institutional Asset Management
Rotterdam,
Netherlands
|
+$50.8M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
JHIU
Janus Henderson Investors US
Denver,
Colorado
|
-$220M |
| 2 |
CIP
Champlain Investment Partners
Burlington,
Vermont
|
-$43.8M |
| 3 |
Fuller & Thaler Asset Management
San Mateo,
California
|
-$29.6M |
| 4 |
Fidelity Investments
Boston,
Massachusetts
|
-$24.7M |
| 5 |
CWAM
Columbia Wanger Asset Management
Chicago,
Illinois
|
-$22.4M |
MASI Hedge Fund Activity: Q1 2017 in Review
365 of the 4,018 institutional investors tracked by Wall St. Rank reported a position in Masimo (MASI) for Q1 2017, worth a combined $3.98B — up 46% from $2.73B a quarter earlier.
Buyers outnumbered sellers: 87 funds opened new MASI positions and 28 closed out — a net gain of 59 holders — while 109 added to existing stakes and 143 trimmed.
The largest buyer was BlackRock, adding an estimated $594M. The largest seller was Janus Henderson Investors US, cutting an estimated $220M.
- 365 institutional investors held Masimo (MASI) as of Q1 2017, up from 314 in Q4 2016.
- Funds reported $3.98B of Masimo stock for Q1 2017, up 46% quarter-over-quarter.
- 87 funds opened new Masimo positions in Q1 2017 and 28 closed out, a net change of +59 holders.
- The largest Masimo buyer in Q1 2017 was BlackRock, an estimated $594M added.
- The largest Masimo seller in Q1 2017 was Janus Henderson Investors US, an estimated $220M sold.
Based on aggregated 13F filings for Q1 2017.