Masimo Ownership | Who Owns Masimo?
Masimo Ownership Summary
Masimo is owned by 105.15% institutional investors, 5.97% insiders. Blackrock funding, inc. /de is the largest institutional shareholder, holding 19.46% 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 | 105.15% | 5.97% | -11.12% |
| Sector | Healthcare Stocks | 488.30% | 11.08% | -399.38% |
| Industry | Medical Instruments & Supplies Stocks | 57.81% | 14.56% | 27.62% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Blackrock funding, inc. /de | 10.51M | 19.46% | $1.77B |
| Blackrock | 9.35M | 17.64% | $1.18B |
| Fmr | 8.10M | 15.16% | $1.34B |
| Politan capital management lp | 4.72M | 8.73% | $793.42M |
| Vanguard group | 4.59M | 8.59% | $758.18M |
| T. rowe price investment management | 2.50M | 4.63% | $420.57M |
| Massachusetts financial services co /ma/ | 2.47M | 4.57% | $415.57M |
| Capital research global investors | 1.86M | 3.44% | $312.16M |
| State street | 1.43M | 2.70% | $179.92M |
| Holocene advisors, lp | 1.24M | 2.30% | $209.20M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Ace management global | 47.69K | 100.00% | $7.88M |
| Politan capital management lp | 4.72M | 56.98% | $793.42M |
| Ensemble capital management | 407.10K | 3.99% | $51.27M |
| Bridger management | 33.64K | 3.34% | $5.66M |
| 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 | 102.07K | 1.85% | $17.17M |
| Rtw investments, lp | 683.29K | 1.64% | $114.94M |
| Durable capital partners lp | 1.16M | 1.48% | $195.79M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Blackrock | 9.35M | 0.03% | 1.47M |
| Fmr | 8.10M | 0.08% | 1.34M |
| Alliancebernstein | 947.39K | 0.05% | 878.59K |
| T. rowe price investment management | 2.50M | 0.27% | 826.89K |
| Viking global investors lp | 767.43K | 0.37% | 767.43K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Ace management global | 47.69K | 100.00% | -917.81K |
| Farallon capital management | - | - | -397.00K |
| Mig capital | - | - | -381.73K |
| Two sigma investments, lp | 39.89K | 0.01% | -302.94K |
| Artisan partners limited partnership | - | - | -299.02K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Viking global investors lp | 767.43K | 0.37% | 767.43K | $129.10M |
| Grantham, mayo, van otterloo | 240.56K | 0.12% | 240.56K | $40.47M |
| Hawk ridge capital management lp | 148.69K | 1.04% | 148.69K | $25.01M |
| Alpha wave global, lp | 102.07K | 1.85% | 102.07K | $17.17M |
| Pfm health sciences, lp | 94.45K | 1.36% | 94.45K | $15.89M |
Sold Out
| Holder | Change |
|---|---|
| American capital advisory | -1.00 |
| Financial management professionals | -1.00 |
| Clearstead trust | -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 % |
|---|---|---|---|---|---|---|---|---|---|---|
| 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% |
| Jun 30, 2024 | 363 | 2.54% | 49,413,792 | -3.99% | 93 | 0.98% | 167 | 20.14% | 110 | -18.52% |
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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