Masimo Ownership | Who Owns Masimo?
Masimo Ownership Summary
Masimo is owned by 16.04% institutional investors, 4.81% insiders, and 79.15% retail investors. Blackrock is the largest institutional shareholder, holding 17.64% of MASI shares. MFS Mid Cap Growth A is the top mutual fund, with 3.15% of its assets in Masimo shares.
MASI Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Masimo | 16.04% | 4.81% | 79.15% |
| Sector | Healthcare Stocks | 232.01% | 10.74% | -142.75% |
| Industry | Medical Instruments & Supplies Stocks | 32.32% | 13.56% | 54.11% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Blackrock | 9.35M | 17.64% | $1.18B |
| Blackrock funding, inc. /de | 8.86M | 16.40% | $1.15B |
| Fmr | 8.21M | 15.21% | $1.21B |
| Politan capital management lp | 4.59M | 8.50% | $677.20M |
| Vanguard group | 4.35M | 8.05% | $565.60M |
| Massachusetts financial services co /ma/ | 2.66M | 4.93% | $346.46M |
| T. rowe price investment management | 2.13M | 3.94% | $313.80M |
| Westfield capital management co lp | 1.52M | 2.82% | $197.96M |
| State street | 1.48M | 2.75% | $219.03M |
| Alyeska investment group | 1.38M | 2.56% | $203.78M |
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 | 2.94% | $1.53M |
| 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 |
| Wilson asset management () pty | 39.44K | 1.32% | $5.13M |
| Rtw investments, lp | 683.29K | 1.24% | $100.82M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Blackrock | 9.35M | 0.03% | 1.47M |
| Squarepoint ops | 620.93K | 0.09% | 546.90K |
| Ubs group | 599.27K | 0.01% | 429.47K |
| Millennium management | 408.06K | 0.03% | 378.81K |
| Norges bank | 377.42K | 0.01% | 377.42K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Blackrock funding, inc. /de | 8.86M | 0.02% | -1.51M |
| Holocene advisors, lp | - | - | -1.24M |
| Capital research global investors | 637.89K | 0.02% | -1.22M |
| Ace management global | 47.69K | 100.00% | -917.81K |
| Alliancebernstein | 53.56K | 0.00% | -790.51K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Norges bank | 377.42K | 0.01% | 377.42K | $49.09M |
| Adage capital partners gp | 150.00K | 0.04% | 150.00K | $22.13M |
| Df dent | 108.65K | 0.21% | 108.65K | $16.03M |
| Hrt financial lp | 92.78K | 0.04% | 92.78K | $12.07M |
| Caption management | 70.30K | 0.14% | 70.30K | $8.85M |
Sold Out
| Holder | Change |
|---|---|
| Financial management professionals | -1.00 |
| Clearstead trust | -1.00 |
| Claris advisors, llc / mo / | -2.00 |
| Advisornet financial | -2.00 |
| Twin peaks wealth advisors | -2.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Dec 31, 2025 | 126 | -65.00% | 8,662,748 | -84.58% | 16 | 0.15% | 52 | -68.29% | 38 | -68.85% |
| 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% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| MFS Mid Cap Growth A | 1.64M | 3.15% | 819.49K |
| MFS Mid Cap Growth Equity | 1.64M | 3.15% | - |
| Vanguard US Total Market Shares ETF | 1.53M | 2.83% | -71.94K |
| iShares Core S&P Mid-Cap ETF | 1.47M | 2.82% | 60.84K |
| Vanguard Total Stock Mkt Idx Inv | 1.44M | 2.76% | 3.41K |
| Fidelity Select Medical Tech and Devcs | 1.28M | 2.45% | -5.00K |
| Fidelity Select Health Care | 1.23M | 2.36% | -20.00K |
| BlackRock Mid-Cap Growth Equity Instl | 1.20M | 2.20% | -18.64K |
| Vanguard Small Cap Index | 1.03M | 1.98% | -155.00 |
| BlackRock Global Uncons Eq Z USD Acc | 1.06M | 1.96% | 31.08K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Jan 28, 2026 | Sampath Anand | EVP, Ops & Clinical Research | Sell | $27.07K |
| Jan 28, 2026 | Sampath Anand | EVP, Ops & Clinical Research | Sell | $900.16K |
| Jan 28, 2026 | Sampath Anand | EVP, Ops & Clinical Research | Sell | $1.63M |
| Aug 12, 2025 | Brennan Michelle | Chairman of the Board | Buy | $15.04K |
| Aug 13, 2025 | Brennan Michelle | Chairman of the Board | Buy | $15.53K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q1 | - | 3 |
| 2025 Q4 | - | - |
| 2025 Q3 | 3 | - |
| 2025 Q2 | - | 3 |
| 2025 Q1 | - | 9 |
MASI Ownership FAQ
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