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Livermore
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Masimo Corp

MASIDelisted Jun 10, 2026
Industry
Electromedical & Electrotherapeutic Apparatus
SEC CIK
0000937556

Masimo Corp was delisted on Jun 10, 2026; its insiders filed their last Form 4 on Jun 12, 2026; 451 institutions reported holding it in 13F filings for Q1 2026, worth $9.69B in total; Soros Fund Management was the only superinvestor holding it.

Superinvestors holding MASI, Q1 2026

1 superinvestor reports holding Masimo Corp on Form 13F, worth $17.9M in total. Weight is Masimo Corp's share of each 13F portfolio; actions compare shares with Q4 2025.

See all superinvestors
Superinvestors holding MASI in Q1 2026
Superinvestor% of portfolioSharesValuevs. previous quarter
Soros Fund ManagementGeorge Soros0.2%100,838$17.9MNew

Moves by quarter

Superinvestors that opened, added to, trimmed or sold out of MASI each quarter, comparing shares with the quarter before. A superinvestor that didn't file for a quarter isn't listed, and isn't counted as selling.

  1. Q1 2026

    1 superinvestor holding at quarter end

    New
    Soros Fund Management
    Sold out
    Viking Global Investors

  2. Q4 2025

    1 superinvestor holding at quarter end

    Reduced
    Viking Global Investors (−52.1%)

  3. Q3 2025

    1 superinvestor holding at quarter end

    Added
    Viking Global Investors (+39.9%)

  4. Q2 2025

    1 superinvestor holding at quarter end

    New
    Viking Global Investors

  5. Q3 2023

    0 superinvestors holding at quarter end

    Sold out
    Fundsmith

  6. Q2 2023

    1 superinvestor holding at quarter end

    Reduced
    Fundsmith (−4.4%)

  7. Q4 2022

    1 superinvestor holding at quarter end

    Reduced
    Fundsmith (−0.1%)

  8. Q3 2022

    1 superinvestor holding at quarter end

    Added
    Fundsmith (+1.2%)

  9. Q2 2022

    1 superinvestor holding at quarter end

    Reduced
    Fundsmith (−0.6%)

  10. Q1 2022

    1 superinvestor holding at quarter end

    Added
    Fundsmith (+74.6%)
    Sold out
    D1 Capital Partners

  11. Q4 2021

    2 superinvestors holding at quarter end

    Added
    Fundsmith (+0.2%)
    Reduced
    D1 Capital Partners (−7.3%)
    Sold out
    Maverick Capital

  12. Q3 2021

    3 superinvestors holding at quarter end

    New
    D1 Capital Partners
    Added
    Fundsmith (+0.4%)
    Reduced
    Maverick Capital (−0.3%)

  13. Q2 2021

    2 superinvestors holding at quarter end

    Added
    Fundsmith (+0.6%), Maverick Capital (+14.5%)