Masimo Corp (MASI): Hedge Fund Ownership & Smart Money Signals (Q1 2026)

Q: Is it too late to buy Masimo Corp (MASI) following the 2026 Q1 hedge fund 13F filings?

As of today, MASI has moved +0.8% since the 2026 Q1 13F filing date (May 15, 2026), compared to +3.2% for the XLV sector ETF — an outperformance of -2.4%. Since the quarter end (March 31, 2026), MASI gained +1.2% vs +2.1% for XLV. The stock is tracking its sector benchmark closely. The signal remains fresh and the entry point is still near the fund's implied reference.

Masimo Corp (MASI)

440 + Investors. Track Smart Money conviction in MASI. See who's accumulating, reducing, or initiating positions.

Smart Money Signals — MASI

Based on 445 hedge funds · latest filing: 2026 Q1 · updated quarterly

📈

Buying streak — 2 quarters in a row

last 6Q

For 2 consecutive quarters, more hedge funds added MASI than sold it. That's a consistent pattern of professional buying — not a one-time trade. When institutions keep buying quarter after quarter, it usually means they see a multi-year opportunity, not just a short-term momentum flip.

🏔️

At the ownership peak (100% of max)

100% of all-time peak

445 hedge funds hold MASI right now — the highest count in 3.0 years. When ownership is this concentrated, any bad news can trigger a chain reaction: one big fund sells, others follow. This is a classic 'crowded trade' — high popularity doesn't equal safety.

📶

Steady growth — +16% more funds vs a year ago

fund count last 6Q

+60 new funds entered over the past year (+16% YoY). Gradual, steady growth in institutional ownership is generally a healthy signal — not a speculative rush, but consistent conviction.

🟢

More buyers than sellers — 60% buying

269 buying181 selling

Last quarter: 269 funds were net buyers (134 opened a brand new position + 135 added to an existing one). Only 181 were sellers (109 trimmed + 72 sold completely). A clear majority buying is a strong confirmation signal.

📈

More new buyers each quarter (+43 vs last Q)

new funds entering per quarter

Funds opening a new MASI position: 46 → 46 → 91 → 134. A growing influx of new institutional buyers means the asset is still gathering momentum — the consensus hasn't fully saturated yet.

🔒

56% of holders stayed for 2+ years

■ 56% conviction (2yr+) ■ 16% medium ■ 28% new

251 out of 445 hedge funds have held MASI for over 2 years without selling. Long-term investors are generally harder to shake out during market stress, creating a stable ownership base that limits the risk of sudden capitulation.

💰

Value +37% but shares only +3% — price-driven

Value

+37%

+2%

Last quarter: the total dollar value of institutional holdings rose +37%, but actual share count only changed +3%. The gap is explained by the stock's price rising — not new buying. Strong value growth with weak share growth means the rally is price momentum, not fresh institutional demand.

🚀

Acceleration phase — new buyers rushing in

80 → 46 → 46 → 91 → 134 new funds/Q

New funds entering each quarter: 46 → 46 → 91 → 134. The pace of institutional discovery is accelerating sharply. This is the 'hot idea' phase — the thesis is being passed from fund to fund. You are not late — the accumulation wave is still building.

🏛️

Veteran-anchored — 66% veterans vs 27% newcomers

■ 66% veterans ■ 7% 1-2yr ■ 27% new

Entry-cohort mix of 458 holders: 303 (66%) are 2+ year veterans, 30 entered 1–2 years ago, and 125 (27%) joined within the past year. A veteran-weighted cap table skews toward institutional memory over fresh momentum.

✅

Strong quality — 37% AUM from major funds

37% from top-100 AUM funds

53 of 439 holders rank in the top 100 by AUM, accounting for 37% of total institutional value held. A meaningful share of the ownership value comes from the most well-resourced institutions.

4.0

out of 10

Moderate Exit Risk

Exit risk score 4.0/10 — some crowding factors present, but no critical concentration. Watch ownership trend over the next 1–2 quarters for direction.

Methodology note: these Smart Money cards use consecutive 13F disclosure snapshots, not trade-by-trade execution data. "Buying", "selling", "new holders", and "trimmed" refer to quarter-over-quarter changes in reported holders, aggregate shares, or disclosed position values between filings. They are useful for ownership regime analysis and crowding, but they do not imply exact trade timing on the filing date.

Metric	All 13F Filers (2026 Q1)	Prior (2025 Q4)	Change
Funds Holding	440	383	14.88%
13F Shares	55M	54M	2.47%
Total Value	$9.53B	$6.95B	37.14%
New Positions	130	91	+39
Increased Positions	134	99	+35
Closed Positions	73	52	+21
Reduced Positions	108	129	-21
Total Calls	14	3	366.67%
Total Puts	5	4	25.0%
PUT/CALL Ratio	0.36	1.33	Bullish

Metric

All 13F Filers (2026 Q1)

Prior (2025 Q4)

Change

Funds Holding

440

383

14.88%

13F Shares

55M

54M

2.47%

Total Value

$9.53B

$6.95B

37.14%

New Positions

130

+39

Increased Positions

134

+35

Closed Positions

+21

Reduced Positions

108

129

-21

Total Calls

366.67%

Total Puts

25.0%

PUT/CALL Ratio

0.36

1.33

Bullish

Institutional Holders (2026 Q1)

440 + investors

Explore institutional interest and hedge fund ownership dynamics. Analyze portfolio weights, new positions, and conviction trends in MASI. Verified SEC 13F-HR filings.

QUARTER:

FILTER:All New Added To Reduced No Change | Overweight >5%

Top 25 MASI holders by conviction (% of portfolio weight) — 2026 Q1 · Source: SEC Form 13F
#	Investor	% of Portfolio	Shares	Mkt Value
1	Politan Capital Management LP	82.89%	4,589,648	$816.4M
2	Beryl Capital Management LLC	35.19%	217,103	$38.6M
3	Slotnik Capital, LLC	12.50%	240,300	$42.7M
4	CIBRA Capital Ltd	7.76%	90,376	$16.1M
5	Nuance Investments, LLC	6.07%	244,704	$43.5M
6	Hbk Investments L P	4.65%	2,576,109	$458.2M
7	First Trust Capital Management L.P.	4.48%	479,403	$85.3M
8	Fort Baker Capital Management LP	4.37%	312,720	$55.6M
9	Water Island Capital LLC	3.86%	194,197	$34.5M
10	Nexpoint Asset Management, L.P.	3.70%	310,130	$55.2M
11	Lockerman Financial Group, INC.	3.36%	10,500	$1.9M
12	Wilson Asset Management (international) Pty Ltd	3.21%	63,984	$11.4M
13	Pentwater Capital Management LP	2.93%	3,176,000	$564.9M
14	Versor Investments LP	2.64%	6,058	$1.1M
15	GABELLI & Co INVESTMENT ADVISERS, INC.	2.34%	88,650	$15.8M
16	Alpine Associates Management INC.	1.98%	189,000	$33.6M
17	Fortress Investment Group LLC	1.62%	35,900	$6.4M
18	Sagefield Capital LP	1.56%	122,240	$21.7M
19	P Schoenfeld Asset Management LP	1.45%	15,000	$2.7M
20	Readystate Asset Management LP	1.37%	171,115	$30.4M
21	Kryger Capital LLC	1.27%	100,589	$17.9M
22	AQR Arbitrage LLC	1.21%	416,956	$73.9M
23	Liontrust Investment Partners LLP	1.21%	627,796	$81.7M
24	Westchester Capital Management, LLC	1.12%	138,428	$24.6M
25	TIG Advisors, LLC	1.11%	135,197	$24.0M

Investor	Ownership History	% of Portfolio	Prev %	Rank	Conviction	Avg Buy Price	13F Score™ 3Y / 7Y	Sell Timing	Shares	Mkt Value	Change	Change %	Source	Quarter	Filed

Frequently Asked Questions — Masimo Corp (MASI)

What does the Smart Money Trend signal show for MASI?

Buying streak — 2 quarters in a row: For 2 consecutive quarters, more hedge funds added MASI than sold it. That's a consistent pattern of professional buying — not a one-time trade. When institutions keep buying quarter after quarter, it usually means they see a multi-year opportunity, not just a short-term momentum flip.

What is the institutional breadth score for MASI?

More buyers than sellers — 60% buying: Last quarter: 269 funds were net buyers (134 opened a brand new position + 135 added to an existing one). Only 181 were sellers (109 trimmed + 72 sold completely). A clear majority buying is a strong confirmation signal.

What is the fund quality score for MASI holders?

Strong quality — 37% AUM from major funds: 53 of 439 holders rank in the top 100 by AUM, accounting for 37% of total institutional value held. A meaningful share of the ownership value comes from the most well-resourced institutions.

How long have hedge funds held MASI?

56% of holders stayed for 2+ years: 251 out of 445 hedge funds have held MASI for over 2 years without selling. Long-term investors are generally harder to shake out during market stress, creating a stable ownership base that limits the risk of sudden capitulation.

Is it too late to buy Masimo Corp (MASI) following the 2026 Q1 hedge fund 13F filings?

As of today, MASI has moved +0.8% since the 2026 Q1 13F filing date (May 15, 2026), compared to +3.2% for the XLV sector ETF — an outperformance of -2.4%. Since the quarter end (March 31, 2026), MASI has gained +1.2% vs +2.1% for XLV. The stock is tracking its sector benchmark closely. The signal remains fresh and the entry point is still near the fund's implied reference.

Where does this institutional ownership data come from?

All holdings data is sourced from SEC Form 13F filings, which institutional investment managers with over $100 million in assets are required to submit quarterly. Data is parsed directly from SEC EDGAR.

Market Cap	--
Enterprise Value	--
Trailing P/E	--
Forward P/E	--
PEG Ratio (5yr expected)	--
Price/Sales (ttm)	--
Price/Book (mrq)	--
Enterprise Value/Revenue	--
Enterprise Value/EBITDA	--
Beta (5Y Monthly)	--
Short Ratio (Days to Cover)	--
Short % of Float	--

Profit Margin	--
Return on Assets (ttm)	--
Return on Equity (ttm)	--

Revenue (ttm)	--
Net Income Avi to Common (ttm)	--
Diluted EPS (ttm)	--
Total Cash (mrq)	--
Total Debt/Equity (mrq)	--
Levered Free Cash Flow (ttm)	--

Masimo Corp (MASI)

Smart Money Signals — MASI

Buying streak — 2 quarters in a row

At the ownership peak (100% of max)

Steady growth — +16% more funds vs a year ago

More buyers than sellers — 60% buying

More new buyers each quarter (+43 vs last Q)

56% of holders stayed for 2+ years

Value +37% but shares only +3% — price-driven

Acceleration phase — new buyers rushing in

Veteran-anchored — 66% veterans vs 27% newcomers

Strong quality — 37% AUM from major funds

Institutional Sentiment Summary — MASI

Hedge Fund Ownership: MASI

Market Analysis: MASI

Analyst Price Targets

Analyst Recommendations

Stock Performance

Company Profile: MASI

Is It Too Late to Buy Masimo Corp (MASI) Based on Hedge Fund 13F Filings?

Hedge Fund Positioning: MASI

Statistics: MASI

Valuation Measures Data as of: --

Financial Highlights

Institutional Holders (2026 Q1)

Frequently Asked Questions — Masimo Corp (MASI)

Welcome to 13Foresight!