As of the latest SEC filings, MASIMO CORP (MASI) is held by 328 institutional funds. The largest fund shareholder is MFS Mid Cap Growth Fund (OTCIX), holding an estimated $288,178,957.50 in market value, representing 2.09% of its portfolio.
Funds holding MASIMO CORP (MASI)
Source: SEC Form N-PORT institutional portfolio disclosures
- Ticker:
- MASI
- CIK:
| Fund | Type | Manager | Weight | Market Value | Shares |
Report Date
|
Filing Date
|
|---|---|---|---|---|---|---|---|
|
OTCIX
MFS Mid Cap Growth Fund
|
MF | Independent / Boutique | 2.09% | $288,178,957.50 | 1,643,450 | Feb 28, 2026 | Apr 22, 2026 |
|
IJH
iShares Core S&P Mid-Cap ETF
|
ETF | BlackRock / iShares | 0.25% | $268,875,228.93 | 1,511,639 | Mar 31, 2026 | May 26, 2026 |
|
VTI
VANGUARD TOTAL STOCK MARKET INDEX FUND
|
ETF | Vanguard | 0.01% | $258,325,225.62 | 1,452,326 | Mar 31, 2026 | May 28, 2026 |
|
NAESX
VANGUARD SMALL-CAP INDEX FUND
|
ETF | Vanguard | 0.11% | $187,261,358.13 | 1,052,799 | Mar 31, 2026 | May 28, 2026 |
|
VISGX
VANGUARD SMALL-CAP GROWTH INDEX FUND
|
ETF | Vanguard | 0.27% | $104,867,883.12 | 589,576 | Mar 31, 2026 | May 28, 2026 |
|
FSMEX
Select Medical Technology and Devices Portfolio
|
MF | Fidelity | 2.69% | $98,196,000.00 | 560,000 | Feb 28, 2026 | Apr 24, 2026 |
|
VEMPX
VANGUARD EXTENDED MARKET INDEX FUND
|
ETF | Vanguard | 0.11% | $90,687,908.85 | 509,855 | Mar 31, 2026 | May 28, 2026 |
|
VARAX
First Trust Merger Arbitrage Fund
|
MF | Independent / Boutique | 4.53% | $71,524,906.53 | 402,119 | Mar 31, 2026 | May 22, 2026 |
|
MDY
SPDR S&P MidCap 400 ETF Trust
|
ETF | State Street (SPDR) | 0.25% | $61,208,624.40 | 344,120 | Mar 31, 2026 | Jun 1, 2026 |
|
FMCHX
Fidelity Mid-Cap Stock Fund
|
MF | Fidelity | 0.66% | $57,409,674.07 | 321,749 | Apr 30, 2026 | Jun 26, 2026 |
|
SMCWX
SMALLCAP World Fund Inc
|
MF | Independent / Boutique | 0.07% | $56,442,775.62 | 317,326 | Mar 31, 2026 | May 28, 2026 |
|
IWP
iShares Russell Mid-Cap Growth ETF
|
ETF | BlackRock / iShares | 0.29% | $53,790,733.92 | 302,416 | Mar 31, 2026 | May 28, 2026 |
|
HMEAX
Nexpoint Merger Arbitrage Fund
|
MF | Independent / Boutique | 3.80% | $52,916,325.00 | 297,500 | Mar 31, 2026 | Jun 1, 2026 |
|
FCTDX
Strategic Advisers Fidelity U.S. Total Stock Fund
|
MF | Fidelity | 0.02% | $43,032,292.80 | 245,408 | Feb 28, 2026 | Apr 24, 2026 |
|
FSMAX
Fidelity Extended Market Index Fund
|
MF | Fidelity | 0.10% | $41,932,322.25 | 239,135 | Feb 28, 2026 | Apr 24, 2026 |
|
SPMD
State Street(R) SPDR(R) Portfolio S&P 400(TM) Mid Cap ETF
|
ETF | State Street (SPDR) | 0.25% | $39,668,211.66 | 223,018 | Mar 31, 2026 | May 28, 2026 |
|
IHI
iShares U.S. Medical Devices ETF
|
ETF | BlackRock / iShares | 1.10% | $34,955,723.88 | 196,524 | Mar 31, 2026 | May 22, 2026 |
|
IWF
iShares Russell 1000 Growth ETF
|
ETF | BlackRock / iShares | 0.03% | $32,323,781.49 | 181,727 | Mar 31, 2026 | May 22, 2026 |
|
FGLGX
Fidelity Series Large Cap Stock Fund
|
MF | Fidelity | 0.13% | $32,230,044.00 | 181,200 | Mar 31, 2026 | May 26, 2026 |
|
IWR
iShares Russell Mid-Cap ETF
|
ETF | BlackRock / iShares | 0.06% | $30,580,833.36 | 171,928 | Mar 31, 2026 | May 28, 2026 |
|
FSMDX
Fidelity Mid Cap Index Fund
|
MF | Fidelity | 0.06% | $29,787,461.06 | 166,942 | Apr 30, 2026 | Jun 26, 2026 |
|
IJK
iShares S&P Mid-Cap 400 Growth ETF
|
ETF | BlackRock / iShares | 0.28% | $28,105,772.31 | 158,013 | Mar 31, 2026 | May 28, 2026 |
|
VHCIX
VANGUARD HEALTH CARE INDEX FUND
|
ETF | Vanguard | 0.12% | $24,311,225.40 | 138,644 | Feb 28, 2026 | Apr 28, 2026 |
|
SCHM
Schwab U.S. Mid-Cap ETF
|
ETF | Charles Schwab | 0.16% | $21,635,735.10 | 123,386 | Feb 28, 2026 | Apr 24, 2026 |
|
FZAOX
Fidelity Advisor Small Cap Fund
|
MF | Fidelity | 0.96% | $21,357,630.00 | 121,800 | Feb 28, 2026 | Apr 24, 2026 |
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