# MASIMO CORP COM

MASIMO CORP COM is a security (CUSIP 574795100) tracked across SEC portfolio filings. 306 institutional managers reported $8.4B on Form 13F as of 2026-06-30; 42 registered fund positions totaling $546.5M via N-PORT as of 2026-05-31.

## Summary

- Issuer: MASIMO CORP
- Class: COM
- CUSIP: 574795100
- Asset category: EC
- 13F holders: 306
- 13F value: $8.4B
- 13F period: 2026-06-30
- N-PORT fund positions: 42
- N-PORT value: $546.5M
- N-PORT report: 2026-05-31

## Top institutional holders (Form 13F)

_Showing 15 of 306 managers by value._

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| BlackRock, Inc. | New York, NY | $826.1M | 4,644,578 |
| [Politan Capital Management LP](https://search.stillhousedata.com/firm/316047) | New York, NY | $816.4M | 4,589,648 |
| [VANGUARD GROUP INC](https://search.stillhousedata.com/firm/105958) | Valley Forge, PA | $565.6M | 4,348,786 |
| Pentwater Capital Management LP | Naples, FL | $564.9M | 3,176,000 |
| BARCLAYS PLC | LONDON, X0 | $488.1M | 2,743,985 |
| [HBK INVESTMENTS L P](https://search.stillhousedata.com/firm/115079) | DALLAS, TX | $458.2M | 2,576,109 |
| FMR LLC | BOSTON, MA | $258.1M | 1,450,823 |
| STATE STREET CORP | BOSTON, MA | $255.7M | 1,437,724 |
| MILLENNIUM MANAGEMENT LLC | NEW YORK, NY | $227.2M | 988,853 |
| GOLDMAN SACHS GROUP INC | NEW YORK, NY | $175.1M | 984,192 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://search.stillhousedata.com/firm/115504) | BOSTON, MA | $170.2M | 956,736 |
| [Balyasny Asset Management L.P.](https://search.stillhousedata.com/firm/138111) | Chicago, IL | $152.3M | 770,986 |
| [AQR CAPITAL MANAGEMENT LLC](https://search.stillhousedata.com/firm/111883) | Greenwich, CT | $147.4M | 831,966 |
| MORGAN STANLEY | NEW YORK, NY | $133.8M | 752,417 |
| JPMORGAN CHASE & CO | NEW YORK, NY | $101.5M | 572,645 |

## Top fund holders (N-PORT)

_Showing 15 of 42 fund positions by value._

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| State Street SPDR S&P MidCap 400SM ETF Trust | SPDR S&P MIDCAP 400 ETF TRUST | $244.8M | 101.10% |
| [VANGUARD EXTENDED MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002841) | VANGUARD INDEX FUNDS | $90.7M | 11.13% |
| [SMALLCAP World Fund Inc](https://search.stillhousedata.com/fund/S000009599) | SMALLCAP World Fund Inc | $56.4M | 6.96% |
| [Fidelity Series Large Cap Stock Fund](https://search.stillhousedata.com/fund/S000039214) | Fidelity Hastings Street Trust | $32.2M | 13.00% |
| [THE ARBITRAGE FUND](https://search.stillhousedata.com/fund/S000006440) | ARBITRAGE FUNDS | $27.0M | 319.85% |
| [The Merger Fund](https://search.stillhousedata.com/fund/S000005158) | Merger Fund | $20.9M | 84.88% |
| [Baird Small/Mid Cap Growth Fund](https://search.stillhousedata.com/fund/S000063403) | Baird Funds Inc | $9.4M | 1217.76% |
| [Fidelity SAI Merger Arbitrage Fund](https://search.stillhousedata.com/fund/S000091043) | Fidelity Greenwood Street Trust | $7.1M | 124.97% |
| [Bridge Builder Tax Managed Small/Mid Cap Fund](https://search.stillhousedata.com/fund/S000076295) | Bridge Builder Trust | $7.0M | 22.99% |
| [Fidelity Advisor Capital Development Fund](https://search.stillhousedata.com/fund/S000006056) | Fidelity Destiny Portfolios | $6.0M | 10.57% |
| [Columbia Mid Cap Index Fund](https://search.stillhousedata.com/fund/S000010826) | COLUMBIA FUNDS SERIES TRUST | $5.8M | 22.90% |
| [Large Cap Index Master Portfolio](https://search.stillhousedata.com/fund/S000033023) | Master Investment Portfolio | $4.6M | 1.28% |
| [VANGUARD BALANCED INDEX FUND](https://search.stillhousedata.com/fund/S000002560) | VANGUARD VALLEY FORGE FUNDS | $4.6M | 0.78% |
| GDL Fund | GDL Fund | $4.6M | 395.79% |
| [NYLI Merger Arbitrage ETF](https://search.stillhousedata.com/fund/S000025931) | New York Life Investments ETF Trust | $4.5M | 178.96% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/574795100.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.