Masimo
MASI
MASI was delisted on the 9th of June, 2026.
176 hedge funds and large institutions have $1.4B 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)
5% more repeat investments, than reductions
Existing positions increased: 68 | Existing positions reduced: 65
5% less first-time investments, than exits
New positions opened: 21 | Existing positions closed: 22
1% less funds holding
Funds holding: 178 → 176 (-2)
19% less capital invested
Capital invested by funds: $1.73B → $1.4B (-$321M)
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 |
ACM
Americafirst Capital Management
Roseville,
California
|
-$619M |
| 2 |
Fuller & Thaler Asset Management
San Mateo,
California
|
-$7.61M |
| 3 |
Norges Bank
Oslo,
Norway
|
-$6.99M |
| 4 |
Bank of New York Mellon
New York
|
-$6.11M |
| 5 |
Two Sigma Investments
New York
|
-$5.73M |
MASI Hedge Fund Activity: Q1 2015 in Review
176 of the 3,754 institutional investors tracked by Wall St. Rank reported a position in Masimo (MASI) for Q1 2015, worth a combined $1.4B — down 19% from $1.73B 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 Americafirst Capital Management, exiting entirely with an estimated $619M sold.
- 176 institutional investors held Masimo (MASI) as of Q1 2015, down from 178 in Q4 2014.
- Funds reported $1.4B of Masimo stock for Q1 2015, down 19% 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 Americafirst Capital Management, an estimated $619M sold.
Based on aggregated 13F filings for Q1 2015.