Masimo Corp

MASIDelisted Jun 10, 2026

Industry: Electromedical & Electrotherapeutic Apparatus
SEC CIK: 0000937556

SEC filings (opens in a new tab)

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.

13F holders, Q1 2021

Institutional positions in Masimo Corp as of Mar 31, 2021. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works

Institutional holders: 481; No complete 13F data for Q4 2020
Shares held: 45.1M; No complete 13F data for Q4 2020
Total value: $10.3B; No complete 13F data for Q4 2020

Holders and value by quarter

Institutions reporting MASI on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.

Institutional holdersQ1 2021: 481 institutions

Value heldQ1 2021: $10.3B

Institutions holding MASI and their total value by quarter
Quarter	Holders	Value
Q2 2026	2	$16.2K
Q1 2026	451	$9.69B
Q4 2025	392	$7.20B
Q3 2025	358	$8.29B
Q2 2025	379	$9.68B
Q1 2025	393	$9.02B
Q4 2024	366	$8.50B
Q3 2024	362	$6.72B
Q2 2024	352	$6.24B
Q1 2024	339	$7.59B
Q4 2023	342	$5.91B
Q3 2023	357	$4.18B
Q2 2023	415	$7.56B
Q1 2023	428	$8.30B
Q4 2022	405	$6.58B
Q3 2022	418	$6.54B
Q2 2022	417	$5.81B
Q1 2022	457	$6.61B
Q4 2021	520	$13.6B
Q3 2021	475	$12.5B
Q2 2021	459	$11.1B
Q1 2021	481	$10.3B

Institutions, Q1 2021

Shares, value and share of portfolio for each institution holding Masimo Corp.

Livermore's 13F data starts with Q1 2021, so Q1 2021 has no change from the previous quarter.

Institutions holding MASI in Q1 2021
Institution	Shares	Value	% of portfolio	Change in shares	Action
BlackRock Inc.	8,155,049	$1.87B	0.06%	–	–
Vanguard Group Inc	4,710,246	$1.08B	0.03%	–	–
FMR LLC	2,412,054	$554.0M	0.05%	–	–
Ownership Capital B.V.	1,891,414	$434.4M	5.65%	–	–
State Street Corp	1,629,406	$374.2M	0.02%	–	–
Invesco Ltd.	1,488,785	$341.9M	0.09%	–	–
Massachusetts Financial Services Co	1,000,352	$229.7M	0.07%	–	–
Champlain Investment Partners, LLC	971,962	$223.2M	1.16%	–	–
Credit Suisse AG	927,507	$213.0M	0.16%	–	–
Bank of New York Mellon Corp	825,882	$189.7M	0.04%	–	–
Neuberger Berman Group LLC	795,501	$182.4M	0.17%	–	–
Geode Capital Management, LLC	611,628	$140.3M	0.02%	–	–
RTW Investments, LP	594,956	$136.6M	2.13%	–	–
Ameriprise Financial Inc	577,083	$132.6M	0.04%	–	–
Vaughan Nelson Investment Management, L.P.	573,619	$131.7M	1.41%	–	–
Waddell & Reed Financial Inc	562,721	$129.2M	0.27%	–	–
Northern Trust Corp	534,410	$122.7M	0.02%	–	–
Martin Currie Ltd	488,307	$112.1M	4.33%	–	–
Legal & General Group Plc	459,080	$105.4M	0.04%	–	–
Geneva Capital Management LLC	453,290	$104.1M	1.78%	–	–
William Blair Investment Management, LLC	438,283	$100.7M	0.33%	–	–
Fundsmith LLPSuperinvestorFundsmith	431,063	$99.0M	0.31%	–	–
Norges Bank	428,587	$98.4M	0.02%	–	–
Eagle Asset Management Inc	401,064	$93.7M	0.42%	–	–
California Public Employees Retirement System	391,869	$90.0M	0.07%	–	–
BNP PARIBAS ASSET MANAGEMENT Holding S.A.	378,896	$87.0M	0.36%	–	–
Citigroup Inc	312,457	$71.8M	0.07%	–	–
Raymond James & Associates	308,366	$70.8M	0.07%	–	–
Wellington Management Group LLP	301,515	$69.2M	0.01%	–	–
Fayez Sarofim & Co	282,724	$64.9M	0.24%	–	–
Charles Schwab Investment Management Inc	273,871	$62.9M	0.02%	–	–
APG Asset Management N.V.	319,664	$62.5M	0.11%	–	–
Swiss National Bank	267,889	$61.5M	0.04%	–	–
UBS Asset Management Americas Inc	256,023	$58.8M	0.03%	–	–
First Republic Investment Management, Inc.	248,510	$57.1M	0.18%	–	–
Dimensional Fund Advisors LP	241,249	$55.4M	0.02%	–	–
UBS Group AG	240,600	$55.3M	0.02%	–	–
Victory Capital Management Inc	219,416	$50.4M	0.05%	–	–
Ensemble Capital Management, LLC	218,692	$50.2M	4.81%	–	–
Nuveen Asset Management, LLC	218,595	$50.2M	0.02%	–	–
Westfield Capital Management Co LP	207,846	$47.7M	0.30%	–	–
DF Dent & Co Inc	201,691	$46.3M	0.54%	–	–
Schroder Investment Management Group	200,381	$46.0M	0.06%	–	–
Fred Alger Management, LLC	193,662	$44.5M	0.12%	–	–
TD Asset Management Inc	192,664	$44.2M	0.05%	–	–
Epoch Investment Partners, Inc.	188,918	$43.4M	0.20%	–	–
Obermeyer Wood Investment Counsel, LLLP	188,204	$43.2M	2.66%	–	–
Bank of America Corp	184,470	$42.4M	0.01%	–	–
Sumitomo Mitsui Trust Holdings, Inc.	182,886	$42.0M	0.03%	–	–
Principal Financial Group Inc	177,977	$40.9M	0.03%	–	–
JPMorgan Chase & Co	177,463	$40.8M	0.01%	–	–
Natixis Investment Managers International	159,200	$36.6M	2.50%	–	–
Rockefeller Capital Management L.P.	149,734	$34.4M	0.23%	–	–
Retirement Systems of Alabama	142,266	$32.7M	0.12%	–	–
Deutsche Bank AG	141,829	$32.6M	0.02%	–	–
Wells Fargo & Company	137,428	$31.6M	0.01%	–	–
ArrowMark Colorado Holdings LLC	136,028	$31.2M	0.23%	–	–
Rhumbline Advisers	133,858	$30.7M	0.04%	–	–
Morgan Stanley	133,059	$30.6M	0.00%	–	–
Goldman Sachs Group Inc	129,280	$29.7M	0.01%	–	–
Natixis Advisors, L.P.	128,948	$29.6M	0.15%	–	–
Handelsbanken Fonder AB	127,930	$29.4M	0.17%	–	–
Bellevue Group AG	126,196	$29.0M	0.31%	–	–
Arrowstreet Capital, Limited Partnership	116,325	$26.7M	0.04%	–	–
Blue Whale Capital LLP	109,250	$25.1M	3.31%	–	–
Manufacturers Life Insurance Company, The	106,870	$24.5M	0.02%	–	–
Montanaro Asset Management Ltd	104,500	$24.0M	3.53%	–	–
Amundi Asset Management US, Inc.	93,130	$21.4M	0.02%	–	–
American International Group, Inc.	92,632	$21.3M	0.09%	–	–
Parametric Portfolio Associates LLC	92,405	$21.2M	0.01%	–	–
California State Teachers Retirement System	91,391	$21.0M	0.03%	–	–
Gamco Investors, Inc. Et Al	90,000	$20.7M	0.18%	–	–
Moore Capital Management, LP	86,550	$19.9M	0.39%	–	–
Alliancebernstein L.P.	86,480	$19.9M	0.01%	–	–
Janus Henderson Group PLC	75,174	$17.3M	0.01%	–	–
State of Michigan Retirement System	73,166	$16.8M	0.11%	–	–
Scout Investments, Inc.	72,155	$16.6M	0.25%	–	–
State Board of Administration of Florida Retirement System	72,022	$16.5M	0.03%	–	–
First Trust Advisors LP	70,181	$16.1M	0.02%	–	–
Baillie Gifford & Co	68,098	$15.6M	0.01%	–	–
Bryn Mawr Trust Co	66,164	$15.2M	0.61%	–	–
Bank of Montreal	63,355	$15.0M	0.01%	–	–
Federated Hermes, Inc.	64,158	$14.7M	0.03%	–	–
New York State Common Retirement Fund	62,335	$14.3M	0.02%	–	–
Two Sigma Investments, LP	61,736	$14.2M	0.04%	–	–
Barclays PLC	60,946	$14.0M	0.01%	–	–
New York State Teachers Retirement System	60,780	$14.0M	0.03%	–	–
AXA S.A.	58,576	$13.5M	0.04%	–	–
Millennium Management LLC	57,540	$13.2M	0.02%	–	–
Logan Capital Management Inc	56,755	$13.0M	0.65%	–	–
British Columbia Investment Management Corp	56,263	$12.9M	0.09%	–	–
Great West Life Assurance Co	52,751	$12.1M	0.03%	–	–
AQR Capital Management LLC	51,558	$11.7M	0.02%	–	–
Bank of Nova Scotia	48,592	$11.2M	0.02%	–	–
SEI Investments Co	45,289	$10.7M	0.03%	–	–
Brown Capital Management LLC	46,665	$10.7M	0.08%	–	–
Mutual of America Capital Management LLC	45,601	$10.5M	0.11%	–	–
Ensign Peak Advisors, Inc	44,566	$10.2M	0.02%	–	–
Two Sigma Advisers, LP	41,800	$9.60M	0.03%	–	–
Eaton Vance Management	40,877	$9.39M	0.01%	–	–