Masimo
MASI
MASI was delisted on the 9th of June, 2026.
176 hedge funds and large institutions have $1.41B invested in Masimo in 2015 Q1 according to their latest regulatory filings, with 21 funds opening new positions, 68 increasing their positions, 65 reducing their positions, and 22 closing their positions.
50% more funds holding in top 10
Funds holding in top 10: 2 → 3 (+1)
27% more capital invested
Capital invested by funds: $1.11B → $1.41B (+$299M)
5% more repeat investments, than reductions
Existing positions increased: 68 | Existing positions reduced: 65
0.99% more ownership
Funds ownership: 79.91% → 80.9% (+0.99%)
5% less first-time investments, than exits
New positions opened: 21 | Existing positions closed: 22
1% less funds holding
Funds holding: 178 → 176 (-2)
86% less call options, than puts
Call options by funds: $161K | Put options by funds: $1.16M
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
RA
Royce & Associates
New York
|
+$12.7M |
| 2 |
Massachusetts Financial Services
Boston,
Massachusetts
|
+$11.7M |
| 3 |
Westfield Capital Management
Boston,
Massachusetts
|
+$8.59M |
| 4 |
CIP
Chartwell Investment Partners
Berywn,
Pennsylvania
|
+$7.55M |
| 5 |
BA
BlackRock Advisors
Wilmington,
Delaware
|
+$6.95M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fuller & Thaler Asset Management
San Mateo,
California
|
-$7.61M |
| 2 |
Norges Bank
Oslo,
Norway
|
-$6.99M |
| 3 |
Bank of New York Mellon
New York
|
-$6.11M |
| 4 |
Two Sigma Investments
New York
|
-$5.73M |
| 5 |
Prudential Financial
Newark,
New Jersey
|
-$5.64M |
MASI Hedge Fund Activity: Q1 2015 in Review
176 of the 3,770 institutional investors tracked by Wall St. Rank reported a position in Masimo (MASI) for Q1 2015, worth a combined $1.41B — up 27% from $1.11B a quarter earlier.
Sellers outnumbered buyers: 22 funds closed out of MASI and 21 opened new positions — a net loss of 1 holder — while 65 trimmed existing stakes and 68 added.
The largest buyer was Royce & Associates, opening a new position worth an estimated $12.7M. The largest seller was Fuller & Thaler Asset Management, cutting an estimated $7.61M.
- 176 institutional investors held Masimo (MASI) as of Q1 2015, down from 178 in Q4 2014.
- Funds reported $1.41B of Masimo stock for Q1 2015, up 27% quarter-over-quarter.
- 21 funds opened new Masimo positions in Q1 2015 and 22 closed out, a net change of -1 holder.
- The largest Masimo buyer in Q1 2015 was Royce & Associates, an estimated $12.7M added.
- The largest Masimo seller in Q1 2015 was Fuller & Thaler Asset Management, an estimated $7.61M sold.
Based on aggregated 13F filings for Q1 2015.