Masimo Ownership | Who Owns Masimo?

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Masimo Ownership Summary

Masimo is owned by 91.77% institutional investors, 8.57% insiders. Blackrock is the largest institutional shareholder, holding 17.64% of MASI shares. Vanguard US Total Market Shares ETF is the top mutual fund, with 2.83% of its assets in Masimo shares.

MASI Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Masimo	91.77%	8.57%	-0.34%
Sector	Healthcare Stocks	57.39%	9.93%	32.68%
Industry	Medical Instruments & Supplies Stocks	46.11%	12.95%	40.94%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock	9.35M	17.64%	$1.18B
Blackrock funding, inc. /de	8.70M	16.29%	$1.44B
Fmr	8.10M	15.16%	$1.34B
Politan capital management lp	4.71M	8.83%	$779.35M
Vanguard group	4.59M	8.59%	$758.18M
Capital research global investors	2.45M	4.60%	$405.81M
Massachusetts financial services co /ma/	1.74M	3.25%	$286.82M
T. rowe price investment management	1.66M	3.11%	$274.79M
Rtw investments, lp	1.46M	2.76%	$184.17M
State street	1.43M	2.70%	$179.92M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Ace management global	47.69K	100.00%	$7.88M
Politan capital management lp	4.71M	50.51%	$779.35M
Ensemble capital management	407.10K	3.99%	$51.27M
Lockerman financial group	13.60K	3.83%	$2.25M
Rtw investments, lp	1.46M	2.85%	$184.17M
Cramer rosenthal mcglynn	222.82K	2.08%	$36.83M
Birchview capital, lp	15.28K	2.06%	$2.53M
Pura vida investments	25.00K	1.99%	$3.15M
Liontrust investment partners llp	792.93K	1.90%	$131.07M
Montanaro asset management	46.50K	1.59%	$7.69M

Top Buyers

Holder	Shares	% Assets	Change
Blackrock	9.35M	0.03%	1.47M
Fmr	8.10M	0.08%	1.34M
Capital research global investors	2.45M	0.08%	1.09M
Massachusetts financial services co /ma/	1.74M	0.09%	943.00K
Alliancebernstein	947.39K	0.05%	878.59K

Top Sellers

Holder	Shares	% Assets	Change
Ace management global	47.69K	100.00%	-917.81K
Farallon capital management	397.00K	0.33%	-861.56K
Westfield capital management co lp	768.86K	0.55%	-625.20K
Mig capital	-	-	-381.73K
Man group	64.89K	0.03%	-335.06K

New Positions

Holder	Shares	% Assets	Change	Value
Raymond james financial	203.97K	0.01%	203.97K	$33.72M
Great lakes advisors	95.73K	0.14%	95.73K	$15.82M
Caption management	70.30K	0.14%	70.30K	$8.85M
Point72 (difc)	58.42K	0.35%	58.42K	$9.66M
Wealthfront advisers	54.68K	0.15%	54.68K	$50.10M

Sold Out

Holder	Change
Pacific capital wealth advisors	-2.00
Financial synergies wealth advisors	-2.00
Claris advisors, llc / mo /	-2.00
Amundi	-2.00
Bokf, na	-2.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Mar 31, 2024	354	-2.21%	51,465,670	2.48%	97	1.08%	139	-23.20%	135	14.41%
Dec 31, 2023	362	-4.99%	50,221,904	5.67%	95	1.17%	181	27.46%	118	-22.88%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard US Total Market Shares ETF	1.53M	2.83%	-71.94K
Vanguard Total Stock Mkt Idx Inv	1.52M	2.82%	890.00
iShares Core S&P Mid-Cap ETF	1.45M	2.69%	2.56K
Fidelity Select Health Care	1.36M	2.52%	18.22K
Fidelity Select Medical Tech and Devcs	1.32M	2.44%	-20.00K
MFS Mid Cap Growth Equity	1.30M	2.42%	688.63K
MFS Mid Cap Growth A	1.28M	2.38%	-8.32K
Vanguard Small Cap Index	1.23M	2.28%	1.01K
American Funds SMALLCAP World A	1.18M	2.20%	-
BlackRock Mid-Cap Growth Equity Instl	999.74K	1.85%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
Mar 14, 2025	REYNOLDS CRAIG B	-	Sell	$341.07K
Mar 10, 2025	Muhsin Bilal	Chief Operating Officer	Sell	$1.67M
Mar 10, 2025	Muhsin Bilal	Chief Operating Officer	Sell	$391.87K
Mar 10, 2025	Muhsin Bilal	Chief Operating Officer	Sell	$649.98K
Mar 10, 2025	Muhsin Bilal	Chief Operating Officer	Sell	$239.40K

Insider Transactions Trends

Date	Buy	Sell
2025 Q1	-	9
2024 Q4	-	-
2024 Q3	-	-
2024 Q2	-	1
2024 Q1	-	-

MASI Ownership FAQ

Who Owns Masimo?

Masimo shareholders are primarily institutional investors at 91.77%, followed by 8.57% insiders and -0.34% retail investors. The average institutional ownership in Masimo's industry, Medical Instruments & Supplies Stocks, is 46.11%, which Masimo exceeds.

Who owns the most shares of Masimo?

Masimo’s largest shareholders are Blackrock (9.35M shares, 17.64%), Blackrock funding, inc. /de (8.7M shares, 16.29%), and Fmr (8.1M shares, 15.16%). Together, they hold 49.10% of Masimo’s total shares outstanding.

Does Blackrock own Masimo?

Yes, BlackRock owns 17.64% of Masimo, totaling 9.35M shares as of Jun 2024. This represents 0.03% of BlackRock's total assets, with a market value of 1.18B$. In the last quarter, BlackRock increased its holdings by 1.47M shares, a 18.66% change.

Who is Masimo’s biggest shareholder by percentage of total assets invested?

Ace management global is Masimo’s biggest shareholder by percentage of total assets invested, with 100.00% of its assets in 47.69K Masimo shares, valued at 7.88M$.

Who is the top mutual fund holder of Masimo shares?

Vanguard US Total Market Shares ETF is the top mutual fund holder of Masimo shares, with 2.83% of its total shares outstanding invested in 1.53M Masimo shares.

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