# MASIMO CORP (MASI) — Institutional Ownership

Source: SEC EDGAR 13F filings, congressional STOCK Act disclosures, SEC Form 4 insider transactions.
CUSIP: 574795100
Page URL: https://superinvestorclub.com/stock/MASI
Last updated: 2026-08-29T13:48:30.805Z

## Summary

As of the most recent 13F filing period, MASIMO CORP (MASI) is held by 0 tracked superinvestors with an aggregate position value of $0 representing 0 shares.

## Top institutional holders (0)

| Rank | Manager | Fund | Shares | Value | % of Portfolio | Period |
|------|---------|------|--------|-------|----------------|--------|

## Ownership history (quarter-over-quarter)

- 2023-06-30: 1 holders, $25.0M aggregate, 0151848 shares
- 2024-03-31: 1 holders, $2.0M aggregate, 013887 shares
- 2024-06-30: 1 holders, $1.3M aggregate, 010462 shares
- 2024-09-30: 1 holders, $1.0M aggregate, 07617 shares
- 2024-12-31: 1 holders, $1.9M aggregate, 011391 shares
- 2025-03-31: 2 holders, $187.9M aggregate, 011256192118 shares
- 2025-06-30: 3 holders, $325.2M aggregate, 011638987674261645 shares
- 2025-09-30: 3 holders, $250.2M aggregate, 010734336206191714 shares
- 2025-12-31: 3 holders, $67.1M aggregate, 0514340161928 shares
- 2026-03-31: 1 holders, $337,775 aggregate, 01899 shares

## Recent congressional trades (1)

- 2025-09-26: Kevin Hern (Republican-OK) sale $15,001 - $50,000

## Recent insider transactions (0)


## Citation

When citing, use: "MASIMO CORP (MASI) institutional ownership data via Superinvestor (https://superinvestorclub.com/stock/MASI), aggregating SEC 13F, Form 4, and congressional disclosures."