Masimo
MASI
MASI was delisted on the 9th of June, 2026.
369 hedge funds and large institutions have $4.72B invested in Masimo in 2018 Q4 according to their latest regulatory filings, with 58 funds opening new positions, 128 increasing their positions, 134 reducing their positions, and 42 closing their positions.
38% more call options, than puts
Call options by funds: $7.16M | Put options by funds: $5.17M
38% more first-time investments, than exits
New positions opened: 58 | Existing positions closed: 42
5% more funds holding
Funds holding: 353 → 369 (+16)
0% more funds holding in top 10
Funds holding in top 10: 4 → 4 (0)
4% less repeat investments, than reductions
Existing positions increased: 128 | Existing positions reduced: 134
1.19% less ownership
Funds ownership: 85.13% → 83.94% (-1.2%)
15% less capital invested
Capital invested by funds: $5.53B → $4.72B (-$809M)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fidelity Investments
Boston,
Massachusetts
|
+$65.5M |
| 2 |
Fundsmith LLP
London,
United Kingdom
|
+$53.5M |
| 3 |
Lord, Abbett & Co
Jersey City,
New Jersey
|
+$33M |
| 4 |
SI
Scout Investments
Kansas City,
Missouri
|
+$30.6M |
| 5 |
First Trust Advisors
Wheaton,
Illinois
|
+$28.2M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BlackRock
New York
|
-$128M |
| 2 |
Millennium Management
New York
|
-$72.5M |
| 3 |
Ameriprise
Minneapolis,
Minnesota
|
-$29.8M |
| 4 |
Marshall Wace
London,
United Kingdom
|
-$27.5M |
| 5 |
Deutsche Bank
Frankfurt Am Main Ge,
Germany
|
-$23.6M |
MASI Hedge Fund Activity: Q4 2018 in Review
369 of the 4,489 institutional investors tracked by Wall St. Rank reported a position in Masimo (MASI) for Q4 2018, worth a combined $4.72B — down 15% from $5.53B a quarter earlier.
Buyers outnumbered sellers: 58 funds opened new MASI positions and 42 closed out — a net gain of 16 holders — while 128 added to existing stakes and 134 trimmed.
The largest buyer was Fidelity Investments, adding an estimated $65.5M. The largest seller was BlackRock, cutting an estimated $128M.
- 369 institutional investors held Masimo (MASI) as of Q4 2018, up from 353 in Q3 2018.
- Funds reported $4.72B of Masimo stock for Q4 2018, down 15% quarter-over-quarter.
- 58 funds opened new Masimo positions in Q4 2018 and 42 closed out, a net change of +16 holders.
- The largest Masimo buyer in Q4 2018 was Fidelity Investments, an estimated $65.5M added.
- The largest Masimo seller in Q4 2018 was BlackRock, an estimated $128M sold.
Based on aggregated 13F filings for Q4 2018.