MASI · Insider trading · 13F holders · Congress trades
Masimo Corporation (MASI)
Who is buying and selling MASI: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 1
- Insider buys, 90 days
- $0
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 1
MASI at a glance
- No open-market insider purchases or sales of MASI were filed in the last 90 days.
- 1 13F filer hold MASI among their 50 largest positions, worth $16.1M combined. The biggest bets by portfolio weight are CIBRA Capital Ltd (7.8%). In their latest 13Fs, 1 manager opened a new position and 0 added to one.
- Members of Congress have disclosed 7 MASI trades since 2015, 0 purchases and 1 sale in the past year; the latest was Kevin Hern (R-OK), selling $15K–50K on Sep 26, 2025.
MASI insider trading
No open-market insider purchases or sales of MASI were filed in the last 90 days.
Who owns MASI? Hedge funds and superinvestors
1 13F filer hold MASI among their 50 largest positions, worth $16.1M combined. The biggest bets by portfolio weight are CIBRA Capital Ltd (7.8%). In their latest 13Fs, 1 manager opened a new position and 0 added to one.
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| CIBRA Capital LtdHedge fund | 7.8% | $16.1M | 90,376 | New | Q1 2026 |
Each manager counts with its latest 13F (Q1 2026: 1). Screen MASI in the grand portfolio →
MASI stock trades by members of Congress
Members of Congress have disclosed 7 MASI trades since 2015, 0 purchases and 1 sale in the past year; the latest was Kevin Hern (R-OK), selling $15K–50K on Sep 26, 2025.
| Filed | Member | Trade | Amount | Traded | Since |
|---|---|---|---|---|---|
| Oct 16, 2025 | Kevin HernR-OK · House | Sale | $15K–50K | Sep 26, 2025 | — |
| Jan 13, 2023 | Kevin HernR-OK · House | Sale | $50K–100K | Dec 19, 2022 | — |
| Nov 10, 2022 | Tommy TubervilleR-AL · Senate | Sale | $1K–15K | Oct 5, 2022 | — |
| Apr 8, 2022 | Tommy TubervilleR-AL · Senate | Buy | $1K–15K | Mar 30, 2022 | — |
| Jul 14, 2021 | Kevin HernR-OK · House | Buy | $100K–250K | Jun 25, 2021 | — |
| Jul 14, 2021 | Kevin HernR-OK · House | Buy | $15K–50K | Jun 25, 2021 | — |
| Feb 26, 2015 | Thom TillisR-NC · Senate | Sale | $1K–15K | Feb 13, 2015 | — |
3 members have traded MASI: Kevin Hern, Tommy Tuberville, Thom Tillis.
MASI questions and answers
Are insiders buying MASI stock?
No open-market insider purchases or sales of MASI were filed in the last 90 days.
Which hedge funds own MASI?
1 13F filer hold MASI among their 50 largest positions, worth $16.1M combined. The biggest bets by portfolio weight are CIBRA Capital Ltd (7.8%). In their latest 13Fs, 1 manager opened a new position and 0 added to one.
Has Congress traded MASI?
Members of Congress have disclosed 7 MASI trades since 2015, 0 purchases and 1 sale in the past year; the latest was Kevin Hern (R-OK), selling $15K–50K on Sep 26, 2025.
Who is the largest holder of MASI?
Among 13F filers, CIBRA Capital Ltd reports the largest MASI position, $16.1M (90,376 shares) in its Q1 2026 13F. The biggest bet by portfolio weight is CIBRA Capital Ltd's: 7.8% of its portfolio.
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