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Livermore
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Masimo Corp

MASIDelisted Jun 10, 2026
Industry
Electromedical & Electrotherapeutic Apparatus
SEC CIK
0000937556

Masimo Corp was delisted on Jun 10, 2026; its insiders filed their last Form 4 on Jun 12, 2026; 451 institutions reported holding it in 13F filings for Q1 2026, worth $9.69B in total; Soros Fund Management was the only superinvestor holding it.

Q1 2026 vs. Q4 2025

How the institutions holding Masimo Corp changed between Q4 2025 and Q1 2026.

All holders in Q1 2026All holders in Q4 2025

13F holders of MASI: Q4 2025 compared with Q1 2026
MeasureQ4 2025Of which not filed for Q1 2026Q1 2026Change
Holders3926451+65
Shares55.4M4.74M54.6M+4.00M (+7.9%)
Value$7.20B$616.6M$9.69B+$3.10B (+47.2%)

6 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so the changes leave them out.

New holders (136)

Institutions that held Masimo Corp at the end of Q1 2026 but not at the end of Q4 2025.

Showing the largest 100 of 136 by value.

Institutions new to MASI in Q1 2026
InstitutionSharesValue% of portfolio
Pentwater Capital Management LP3,176,000$564.9M4.01%
HBK Investments L P2,576,109$458.2M5.77%
Vanguard Capital Management LLC2,050,045$364.6M0.01%
Vanguard Portfolio Management LLC2,006,861$357.0M0.02%
Balyasny Asset Management LLC770,986$137.1M0.27%
Davidson Kempner Capital Management LP585,988$104.2M1.85%
FIL Ltd482,000$85.7M0.07%
Vivaldi Asset Management, LLC479,403$85.3M4.48%
HSBC Holdings PLC473,434$84.3M0.05%
CNH Partners LLC416,956$73.9M1.21%
O'Connor Alternative Investments LLC412,903$73.4M3.85%
Hudson Bay Capital Management LP330,679$58.8M0.35%
Fort Baker Capital Management LP312,720$55.6M4.93%
Highland Capital Management Fund Advisors, L.P.310,130$55.2M3.85%
Capitolis Liquid Global Markets LLC309,102$55.0M0.35%
Vanguard Fiduciary Trust Co289,867$51.6M0.01%
Whitebox Advisors LLC270,001$48.0M0.68%
Nuance Investments, LLC244,704$43.5M6.07%
Slotnik Capital, LLC240,300$42.7M12.70%
Polar Asset Management Partners Inc.232,026$41.3M0.98%
MUFG Securities EMEA plc225,400$40.1M0.60%
Beryl Capital Management LLC217,103$38.6M35.54%
Water Island Capital LLC194,197$34.5M4.60%
Alpine Associates Management Inc.189,000$33.6M1.98%
Arrowstreet Capital, Limited Partnership172,588$30.7M0.02%
Readystate Asset Management LP171,115$30.4M1.78%
Glazer Capital, LLC157,858$28.1M0.60%
Woodline Partners LP153,234$27.3M0.10%
Capula Management Ltd142,800$25.4M0.22%
Champlain Investment Partners, LLC141,284$25.1M0.32%
Westchester Capital Management, LLC138,428$24.6M1.19%
TIG Advisors, LLC135,197$24.0M1.15%
Sagefield Capital LP122,240$21.7M1.56%
Winton Group Ltd112,783$20.1M0.70%
Weiss Asset Management LP112,600$20.0M0.37%
Nomura Holdings Inc109,390$19.5M0.16%
Blackstone Group Inc.109,383$19.5M0.08%
Soros Fund Management LLCSuperinvestorSoros Fund Management100,838$17.9M0.25%
Kryger Capital LLC100,589$17.9M1.27%
CIBRA Capital Ltd90,376$16.1M7.76%
Gabelli & Co Investment Advisers, Inc.88,650$15.8M2.34%
Healthcare of Ontario Pension Plan Trust Fund67,600$12.0M0.02%
Carmignac Gestion64,831$11.5M0.18%
Caxton Associates LLP45,917$8.17M0.19%
Lighthouse Investment Partners, LLC42,851$7.62M0.29%
Vanguard Asset Management, Ltd40,876$7.27M0.01%
Fortress Investment Group LLC35,900$6.39M1.63%
Alberta Investment Management Corp34,107$6.07M0.04%
Ieq Capital, LLC32,217$5.73M0.03%
Groupe la Francaise31,950$5.68M0.08%
Taconic Capital Advisors LP30,000$5.34M3.65%
Tokio Marine Asset Management Co Ltd29,400$5.23M0.19%
TPG GP A, LLC25,000$4.45M0.12%
Centiva Capital, LP23,713$4.22M0.20%
Abc Arbitrage SA23,604$4.20M0.56%
Credit Industriel Et Commercial23,050$4.10M0.65%
Capricorn Fund Managers Ltd22,811$4.06M0.63%
New York Life Investment Management LLC22,191$3.95M0.03%
ING Groep NV21,700$3.86M0.02%
Vanguard Global Advisers, LLC18,433$3.28M0.00%
LMR Partners LLP16,300$2.90M0.03%
P Schoenfeld Asset Management LP15,000$2.67M2.12%
Skandinaviska Enskilda Banken AB (publ)12,978$2.31M0.05%
Alpine Global Management, LLC12,500$2.22M0.34%
Oxford Asset Management LLP12,202$2.17M0.88%
Mint Tower Capital Management B.V.12,000$2.13M0.21%
Vanguard Investments Australia, Ltd.11,498$2.05M0.01%
Harvest Management LLC11,000$1.96M1.04%
Brevan Howard Capital Management LP10,628$1.89M0.02%
Moore Capital Management, LP10,020$1.78M0.06%
Allstate Corp7,898$1.40M0.02%
Odyssean, LLC7,845$1.40M0.51%
Teacher Retirement System of Texas5,921$1.05M0.00%
Brighton Jones LLC5,281$939.3K0.02%
Fieldview Capital Management, LLC4,784$850.9K0.25%
Prelude Capital Management, LLC4,732$841.7K0.06%
Diversified Trust Co4,685$833.3K0.02%
Wolverine Asset Management LLC4,549$809.1K0.01%
Evergreen Capital Management LLC4,149$738.0K0.02%
Neo Ivy Capital Management4,045$719.5K0.19%
Buckingham Strategic Partners3,296$586.2K0.01%
Canvas Wealth Advisors, LLC3,191$567.6K0.10%
Diametric Capital, LP3,100$551.4K0.14%
Integrated Wealth Concepts LLC3,077$547.3K0.00%
Machina Capital S.A.S.2,761$491.1K0.10%
DnB Asset Management AS2,411$428.8K0.00%
Bull Harbor Capital LLC2,151$382.6K0.10%
Skopos Labs, Inc.2,015$358.4K0.01%
Everence Capital Management Inc1,773$315.0K0.02%
CAPROCK Group, Inc.1,761$313.3K0.01%
Evolve Private Wealth, LLC1,713$304.7K0.02%
Armistice Capital, LLC1,642$292.1K0.01%
Fifth Third Wealth Advisors LLC1,528$271.8K0.01%
Caerus Investment Advisors, LLC1,526$271.4K0.11%
MML Investors Services, LLC1,524$271.1K0.00%
Calamos Advisors LLC1,511$268.8K0.00%
Calamos Wealth Management LLC1,511$268.8K0.01%
Andina Capital Management, LLC1,420$252.6K0.22%
Warren Averett Asset Management, LLC1,415$251.7K0.00%
Guggenheim Capital LLC1,407$250.3K0.00%

Sold out (71)

Institutions that held Masimo Corp at the end of Q4 2025 and filed for Q1 2026 without it.

Institutions that sold out of MASI in Q1 2026
InstitutionShares, Q4 2025Value, Q4 2025
T. Rowe Price Investment Management, Inc.2,330,158$303.1M
Naya Capital Management UK Ltd1,560,697$203.0M
Alyeska Investment Group, L.P.1,259,307$163.8M
RTW Investments, LP683,294$88.9M
Viking Global Investors LPSuperinvestorViking Global Investors514,340$66.9M
Bamco Inc373,899$48.6M
Parkman Healthcare Partners LLC200,000$26.0M
DF Dent & Co Inc142,626$18.6M
TD Asset Management Inc114,514$14.9M
Falcon Edge Capital, LP75,552$9.83M
Swedbank AB59,500$7.74M
Assenagon Asset Management S.A.53,525$6.96M
Capital Fund Management S.A.47,586$6.19M
Sofinnova Investments, Inc.46,201$6.01M
Walleye Capital LLC42,049$5.47M
Nordea Investment Management AB28,319$3.69M
Campbell & CO Investment Adviser LLC27,783$3.61M
Logan Capital Management Inc26,505$3.45M
Gluskin Sheff & Assoc Inc25,805$3.36M
Susquehanna International Group, LLP16,849$2.19M
Dark Forest Capital Management LP16,385$2.13M
Deerfield Management Company, L.P. (Series C)16,147$2.10M
Kayne Anderson Rudnick Investment Management LLC15,932$2.07M
Sumitomo Mitsui Trust Holdings, Inc.14,572$1.90M
Trexquant Investment LP13,920$1.81M
Lecap Asset Management Ltd13,196$1.72M
XTX Topco Ltd12,746$1.66M
Harbor Capital Advisors, Inc.9,599$1.25M
Dynamic Technology Lab Private Ltd9,480$1.23M
Birchview Capital, LP8,280$1.08M
OP Asset Management Ltd8,207$1.07M
Wellington Management Group LLP7,832$1.02M
Graham Capital Management, L.P.6,017$782.6K
Cinctive Capital Management LP5,681$738.9K
Malaga Cove Capital, LLC5,366$697.9K
Exchange Traded Concepts, LLC5,101$663.4K
Laird Norton Trust Company, LLC4,778$621.4K
Capstone Investment Advisors, LLC4,718$613.6K
Stifel Financial Corp4,526$588.7K
NEOS Investment Management LLC4,342$564.7K
Tema ETFs LLC4,342$564.7K
Gsa Capital Partners LLP3,682$479.0K
CenterBook Partners LP3,148$409.4K
Farringdon Capital, Ltd.3,141$408.5K
Havemeyer Place LP3,020$392.8K
State of Wyoming2,896$376.7K
111 Capital2,871$373.4K
Ensign Peak Advisors, Inc2,711$352.6K
Oppenheimer Asset Management Inc.2,503$325.5K
Orser Capital Management, LLC2,450$318.6K
First Trust Advisors LP2,341$304.5K
Inceptionr LLC2,202$286.4K
nVerses Capital, LLC2,067$268.8K
Aigen Investment Management, LP2,018$262.5K
Virtu Financial LLC1,985$258.0K
ISAM Funds (UK) Ltd1,762$229.2K
Vontobel Holding Ltd.1,549$201.5K
Caitong International Asset Management Co., Ltd890$115.8K
Danske Bank A/S400$52.0K
Kohmann Bosshard Financial Services, LLC342$44.5K
Quest Partners LLC151$19.6K
Flagship Harbor Advisors, LLC111$14.4K
J.Safra Asset Management Corp105$13.7K
Elyxium Wealth, LLC55$7.15K
Navalign, LLC50$6.50K
Inlight Wealth Management, LLC30$3.90K
MidFirst Bank30$3.90K
First Eagle Investment Management, LLC28$3.64K
Optiver Holding B.V.18$2.34K
SageView Advisory Group, LLC10$1.30K
Investors Portfolio Services LLC1$82

Not filed for Q1 2026 yet (6)

Institutions that held Masimo Corp at the end of Q4 2025 and haven't filed a 13F for Q1 2026. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding MASI in Q4 2025 that haven't filed for Q1 2026
InstitutionShares, Q4 2025Value, Q4 2025
Vanguard Group Inc4,348,786$565.6M
Norges Bank377,421$49.1M
Comerica Bank12,233$1.59M
BancorpSouth Bank2,172$282.5K
Global Retirement Partners, LLC205$26.7K
CIBC Private Wealth Group, LLC24$3.12K