Masimo Ownership | Who Owns Masimo?
Masimo Ownership Summary
Masimo is owned by 18.88% institutional investors, 6.06% insiders, and 75.07% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 19.19% of MASI shares. MFS Mid Cap Growth Equity is the top mutual fund, with 3.09% of its assets in Masimo shares.
MASI Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Masimo | 18.88% | 6.06% | 75.07% |
| Sector | Healthcare Stocks | 42.54% | 10.83% | 46.63% |
| Industry | Medical Instruments & Supplies Stocks | 40.77% | 13.85% | 45.38% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Blackrock funding, inc. /de | 10.36M | 19.19% | $1.53B |
| Blackrock | 9.35M | 17.64% | $1.18B |
| Fmr | 8.21M | 15.21% | $1.21B |
| Vanguard group | 4.81M | 8.91% | $709.72M |
| Politan capital management lp | 4.59M | 8.50% | $677.20M |
| Massachusetts financial services co /ma/ | 2.62M | 4.85% | $386.58M |
| T. rowe price investment management | 2.13M | 3.94% | $313.80M |
| Capital research global investors | 1.85M | 3.43% | $273.58M |
| State street | 1.48M | 2.75% | $219.03M |
| Westfield capital management co lp | 1.42M | 2.63% | $209.41M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Ace management global | 47.69K | 100.00% | $7.88M |
| Politan capital management lp | 4.59M | 61.54% | $677.20M |
| Ensemble capital management | 407.10K | 3.99% | $51.27M |
| Bridger management | 47.84K | 3.80% | $7.06M |
| Lockerman financial group | 11.80K | 2.19% | $1.74M |
| Pura vida investments | 25.00K | 1.99% | $3.15M |
| Liontrust investment partners llp | 792.93K | 1.90% | $131.07M |
| Alpha wave global, lp | 97.10K | 1.45% | $14.33M |
| Rtw investments, lp | 683.29K | 1.24% | $100.82M |
| Cramer rosenthal mcglynn | 114.61K | 1.05% | $16.91M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Blackrock | 9.35M | 0.03% | 1.47M |
| Squarepoint ops | 620.93K | 0.09% | 546.90K |
| Millennium management | 408.06K | 0.03% | 378.81K |
| Viking global investors lp | 1.07M | 0.41% | 306.01K |
| Goldman sachs group | 744.40K | 0.01% | 272.88K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Holocene advisors, lp | - | - | -1.24M |
| Ace management global | 47.69K | 100.00% | -917.81K |
| Alliancebernstein | 53.56K | 0.00% | -790.51K |
| Durable capital partners lp | 620.62K | 0.68% | -543.28K |
| Farallon capital management | - | - | -397.00K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Adage capital partners gp | 150.00K | 0.04% | 150.00K | $22.13M |
| Df dent | 108.65K | 0.21% | 108.65K | $16.03M |
| Jupiter asset management | 84.66K | 0.11% | 84.66K | $12.49M |
| Caption management | 70.30K | 0.14% | 70.30K | $8.85M |
| Capital fund management | 34.42K | 0.01% | 34.42K | $5.08M |
Sold Out
| Holder | Change |
|---|---|
| Clearstead trust | -1.00 |
| Financial management professionals | -1.00 |
| American capital advisory | -1.00 |
| Claris advisors, llc / mo / | -2.00 |
| Advisornet financial | -2.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Sep 30, 2025 | 147 | -61.21% | 10,193,987 | -82.28% | 18 | 0.17% | 58 | -66.67% | 54 | -59.40% |
| Jun 30, 2025 | 375 | -5.54% | 56,778,550 | 4.69% | 105 | 1.04% | 171 | -19.34% | 132 | 11.86% |
| Mar 31, 2025 | 392 | 5.38% | 54,108,094 | 5.12% | 100 | 1.08% | 209 | 20.11% | 117 | -4.10% |
| Dec 31, 2024 | 343 | -8.78% | 49,007,771 | -2.29% | 91 | 1.04% | 159 | -5.36% | 111 | -8.26% |
| Sep 30, 2024 | 371 | 1.64% | 49,915,730 | 1.01% | 93 | 1.08% | 169 | - | 117 | 6.36% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| MFS Mid Cap Growth Equity | 1.68M | 3.09% | 230.99K |
| MFS Mid Cap Growth A | 1.63M | 3.00% | -43.77K |
| Vanguard US Total Market Shares ETF | 1.53M | 2.83% | -71.94K |
| Vanguard Total Stock Mkt Idx Inv | 1.53M | 2.82% | -32.31K |
| iShares Core S&P Mid-Cap ETF | 1.46M | 2.70% | - |
| Fidelity Select Health Care | 1.43M | 2.63% | 28.00K |
| Fidelity Select Medical Tech and Devcs | 1.35M | 2.49% | 30.00K |
| American Funds SMALLCAP World A | 1.21M | 2.24% | 65.00K |
| BlackRock Mid-Cap Growth Equity Instl | 1.20M | 2.20% | -18.64K |
| Vanguard Small Cap Index | 1.18M | 2.18% | -7.90K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Aug 12, 2025 | Brennan Michelle | Chairman of the Board | Buy | $15.04K |
| Aug 13, 2025 | Brennan Michelle | Chairman of the Board | Buy | $15.53K |
| Aug 11, 2025 | Jellison William R | - | Buy | $437.94K |
| May 12, 2025 | Muhsin Bilal | Chief Operating Officer | Sell | $631.51K |
| May 12, 2025 | Muhsin Bilal | Chief Operating Officer | Sell | $914.66K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2025 Q3 | 3 | - |
| 2025 Q2 | - | 3 |
| 2025 Q1 | - | 9 |
| 2024 Q4 | - | - |
| 2024 Q3 | - | - |
MASI Ownership FAQ
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