MASIMO CORP (MASI) — Institutional Holders, Q2 2026
2 institutional investment managers reported a MASI position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $16.2K. Every filer is listed below, ranked by position value. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
MASI in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
None this quarter.
Biggest sellers
- BlackRockSold out · -4,644,578 sh-$836.0M
- Politan Capital ManagementSold out · -4,589,648 sh-$826.1M
- Pentwater Capital ManagementSold out · -3,176,000 sh-$571.7M
- BARCLAYS PLCSold out · -2,743,985 sh-$493.9M
- HBK INVESTMENTS L PSold out · -2,576,109 sh-$463.7M
MASI 13F holders ranked 1–2 of 2
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | IFP Advisors#1 · 88 sh | 88 | $15.8K | — | -87.7% |
| 2 | HUNTINGTON NATIONAL BANK#2 · 2 sh | 2 | $360.00 | 0.00% | -99.9% |
Funds that sold out of MASI in Q2 2026 (442)
Held MASI at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q1 2026 |
|---|---|---|
| BlackRock4,644,578 sh | 4,644,578 | $826.1M |
| Politan Capital Management4,589,648 sh | 4,589,648 | $816.4M |
| Pentwater Capital Management3,176,000 sh | 3,176,000 | $564.9M |
| BARCLAYS PLC2,743,985 sh | 2,743,985 | $488.1M |
| HBK INVESTMENTS L P2,576,109 sh | 2,576,109 | $458.2M |
| MASSACHUSETTS FINANCIAL SERVICES2,342,790 sh | 2,342,790 | $416.7M |
| VANGUARD CAPITAL MANAGEMENT2,050,045 sh | 2,050,045 | $364.6M |
| VANGUARD PORTFOLIO MANAGEMENT2,006,861 sh | 2,006,861 | $357.0M |
| FMR1,450,823 sh | 1,450,823 | $258.1M |
| STATE STREET1,437,724 sh | 1,437,724 | $255.7M |
| MILLENNIUM MANAGEMENT988,853 sh | 988,853 | $175.9M |
| GOLDMAN SACHS GROUP984,192 sh | 984,192 | $175.1M |
| GEODE CAPITAL MANAGEMENT956,736 sh | 956,736 | $170.2M |
| AQR CAPITAL MANAGEMENT831,966 sh | 831,966 | $147.4M |
| BALYASNY ASSET MANAGEMENT L.P.770,986 sh | 770,986 | $137.1M |
| MORGAN STANLEY752,417 sh | 752,417 | $133.8M |
| JPMORGAN CHASE572,645 sh | 572,645 | $101.5M |
| CITIGROUP533,388 sh | 533,388 | $94.9M |
| SG Americas Securities522,824 sh | 522,824 | $93.0M |
| FIL Ltd482,000 sh | 482,000 | $85.7M |
| First Capital Management L.P.479,403 sh | 479,403 | $85.3M |
| HSBC PLC473,434 sh | 473,434 | $84.3M |
| UBS Group AG468,257 sh | 468,257 | $83.3M |
| Liontrust Investment Partners LLP627,796 sh | 627,796 | $81.7M |
| Magnetar Financial427,081 sh | 427,081 | $76.0M |
| AQR Arbitrage416,956 sh | 416,956 | $73.9M |
| Neuberger Berman Group403,309 sh | 403,309 | $71.7M |
| NORTHERN390,437 sh | 390,437 | $69.4M |
| Squarepoint Ops389,359 sh | 389,359 | $69.3M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT386,898 sh | 386,898 | $68.8M |
| Capital Research Global Investors359,058 sh | 359,058 | $63.9M |
| Gotham Asset Management341,468 sh | 341,468 | $60.7M |
| WESTFIELD CAPITAL MANAGEMENT341,229 sh | 341,229 | $60.7M |
| ALLIANCEBERNSTEIN L.P.455,354 sh | 455,354 | $59.2M |
| Hudson Bay Capital Management330,679 sh | 330,679 | $58.8M |
| Corient Private Wealth321,600 sh | 321,600 | $57.2M |
| Fort Baker Capital Management312,720 sh | 312,720 | $55.6M |
| NEXPOINT ASSET MANAGEMENT, L.P.310,130 sh | 310,130 | $55.2M |
| CAPITOLIS LIQUID GLOBAL MARKETS309,102 sh | 309,102 | $55.0M |
| Bank of New York Mellon306,400 sh | 306,400 | $54.5M |
| Qube Research & Technologies Ltd291,481 sh | 291,481 | $51.8M |
| VANGUARD FIDUCIARY289,867 sh | 289,867 | $51.6M |
| CITADEL ADVISORS281,366 sh | 281,366 | $50.0M |
| WHITEBOX ADVISORS270,001 sh | 270,001 | $48.0M |
| HRT FINANCIAL264,837 sh | 264,837 | $47.1M |
| NUANCE INVESTMENTS244,704 sh | 244,704 | $43.5M |
| Amundi243,143 sh | 243,143 | $43.2M |
| Slotnik Capital240,300 sh | 240,300 | $42.7M |
| RENAISSANCE TECHNOLOGIES239,500 sh | 239,500 | $42.6M |
| Polar Asset Management Partners232,026 sh | 232,026 | $41.3M |
| BANK OF AMERICA232,003 sh | 232,003 | $41.3M |
| MUFG Securities EMEA plc225,400 sh | 225,400 | $40.1M |
| Beryl Capital Management217,103 sh | 217,103 | $38.6M |
| CANADA PENSION PLAN INVESTMENT BOARD209,500 sh | 209,500 | $37.3M |
| Erste Asset Management GmbH200,000 sh | 200,000 | $35.5M |
| WATER ISLAND CAPITAL194,197 sh | 194,197 | $34.5M |
| ALPINE ASSOCIATES MANAGEMENT189,000 sh | 189,000 | $33.6M |
| AMERICAN CENTURY COMPANIES188,073 sh | 188,073 | $33.5M |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP172,588 sh | 172,588 | $30.7M |
| READYSTATE ASSET MANAGEMENT171,115 sh | 171,115 | $30.4M |
| RAYMOND JAMES FINANCIAL170,527 sh | 170,527 | $30.3M |
| Man Group plc166,235 sh | 166,235 | $29.6M |
| DIMENSIONAL FUND ADVISORS164,402 sh | 164,402 | $29.2M |
| GLAZER CAPITAL157,858 sh | 157,858 | $28.1M |
| Woodline Partners153,234 sh | 153,234 | $27.3M |
| BANK OF NOVA SCOTIA152,584 sh | 152,584 | $27.1M |
| TUDOR INVESTMENT ET AL143,884 sh | 143,884 | $25.6M |
| Capula Management Ltd142,800 sh | 142,800 | $25.4M |
| Champlain Investment Partners141,284 sh | 141,284 | $25.1M |
| Westchester Capital Management138,428 sh | 138,428 | $24.6M |
| Grantham, Mayo, Van Otterloo137,617 sh | 137,617 | $24.5M |
| TIG Advisors135,197 sh | 135,197 | $24.0M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AME133,689 sh | 133,689 | $23.8M |
| RHUMBLINE ADVISERS129,619 sh | 129,619 | $23.1M |
| GABELLI FUNDS126,082 sh | 126,082 | $22.4M |
| GW&K Investment Management122,781 sh | 122,781 | $21.8M |
| Sagefield Capital122,240 sh | 122,240 | $21.7M |
| Schonfeld Strategic Advisors117,297 sh | 117,297 | $20.9M |
| WINTON GROUP Ltd112,783 sh | 112,783 | $20.1M |
| Weiss Asset Management112,600 sh | 112,600 | $20.0M |
| Nuveen111,542 sh | 111,542 | $19.8M |
| NOMURA109,390 sh | 109,390 | $19.5M |
| Blackstone109,383 sh | 109,383 | $19.5M |
| PRINCIPAL FINANCIAL GROUP102,718 sh | 102,718 | $18.3M |
| SOROS FUND MANAGEMENT100,838 sh | 100,838 | $17.9M |
| Kryger Capital100,589 sh | 100,589 | $17.9M |
| SCHRODER INVESTMENT MANAGEMENT GROUP96,179 sh | 96,179 | $17.1M |
| GAMCO INVESTORS, ET AL92,000 sh | 92,000 | $16.4M |
| MARSHALL WACE, LLP90,657 sh | 90,657 | $16.1M |
| Swiss National Bank90,300 sh | 90,300 | $16.1M |
| DEUTSCHE BANK AG\89,387 sh | 89,387 | $15.9M |
| GABELLI & INVESTMENT ADVISERS88,650 sh | 88,650 | $15.8M |
| CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM77,397 sh | 77,397 | $13.8M |
| VOLORIDGE INVESTMENT MANAGEMENT70,000 sh | 70,000 | $12.5M |
| Invesco Ltd.69,144 sh | 69,144 | $12.3M |
| HEALTHCARE OF ONTARIO PENSION PLAN FUND67,600 sh | 67,600 | $12.0M |
| Verition Fund Management66,853 sh | 66,853 | $11.9M |
| AMERIPRISE FINANCIAL65,203 sh | 65,203 | $11.6M |
| PICTON MAHONEY ASSET MANAGEMENT65,000 sh | 65,000 | $11.6M |
| Carmignac Gestion64,831 sh | 64,831 | $11.5M |
And 342 smaller positions.
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.