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MASI — MASIMO CORP

Reported value held$4.23B
Funds holding (latest)54
Sector—

MASI (MASIMO CORP) is tracked on HoldingsHub across five years of quarterly 13F filings. 54 funds have reported positions historically, with the sum of their latest reported stakes valued at $4.23B. No fund in our coverage reported a position in the latest filing period, which typically means the stock has fallen out of the tracked funds' portfolios rather than that it cannot be bought.

All figures on this page are computed from SEC Form 13F quarterly filings. 13F filers disclose long positions of $100,000 or more within 45 days of quarter end; short positions, options overlays and intra-quarter trades are not included, so treat the numbers as a quarterly snapshot of institutional ownership rather than real-time positioning.

Q1 2026 — 38 funds

FundSharesValuePortfolio WeightChange
BlackRock Inc history 4.64M $826.13M 0.01% Reduce
MFS Investment Management history 2.34M $416.69M 0.14% Reduce
Fidelity Management & Research (FMR) history 1.45M $258.06M 0.01% Reduce
Millennium Management history 1.28M $227.22M 0.10% Add
Goldman Sachs Group history 984.19K $175.06M 0.02% Add
Geode Capital Management history 956.74K $170.21M 0.01% Hold
Balyasny Asset Management history 856.09K $152.27M 0.21% New
AQR Capital Management history 831.97K $147.40M 0.07% Reduce
Morgan Stanley history 752.42K $133.83M 0.01% Reduce
Citigroup Inc history 533.39K $94.87M 0.04% Add
Fidelity International (FIL) history 482.00K $85.73M 0.07% New
UBS Group AG history 468.26K $83.29M 0.01% Reduce
Northern Trust Corp history 390.44K $69.45M 0.01% Add
Charles Schwab Investment Management history 386.90K $68.82M 0.01% Add
Capital Research Global Investors history 359.06K $63.87M 0.01% Reduce
Citadel Advisors history 332.77K $59.19M 0.01% Add
BNY Mellon history 306.40K $54.50M 0.01% Reduce
Amundi US history 243.14K $43.25M 0.01% Add
Renaissance Technologies history 239.50K $42.60M 0.07% Add
Bank of America Corp history 232.00K $41.27M 0.00% Reduce
CPP Investments history 209.50K $37.26M 0.02% Add
Arrowstreet Capital history 172.59K $30.70M 0.02% New
Principal Global Investors history 102.72K $18.27M 0.01% Add
Soros Fund Management history 100.84K $17.94M 0.21% New
Marshall Wace history 90.66K $16.13M 0.02% Reduce
Deutsche Bank AG history 89.39K $15.90M 0.01% Add
Invesco Ltd history 69.14K $12.30M 0.00% Reduce
Legal & General Investment Management America history 62.55K $11.12M 0.00% Reduce
Manulife Financial history 23.64K $4.20M 0.00% Reduce
Janus Henderson Group history 20.00K $3.56M 0.00% Hold
D. E. Shaw & Co history 19.79K $3.52M 0.00% Reduce
Wells Fargo & Co history 11.34K $2.02M 0.00% Reduce
Moore Capital Management history 10.02K $1.78M 0.04% New
PNC Financial Services history 5.11K $908.38K 0.00% Reduce
Franklin Resources history 4.44K $789.03K 0.00% Add
Prudential Financial history 1.96K $347.74K 0.00% Hold
Bridgewater Associates history 1.90K $337.77K 0.00% Add
T. Rowe Price Associates history 45.83K $8.15K 0.00% Reduce

Q4 2025 — 40 funds

FundSharesValuePortfolio WeightChange
BlackRock Inc history 8.86M $1.15B 0.02% Reduce
Fidelity Management & Research (FMR) history 7.86M $1.02B 0.05% Reduce
Vanguard Group history 4.35M $565.60M 0.01% Reduce
MFS Investment Management history 2.66M $346.46M 0.11% Add
AQR Capital Management history 1.09M $141.94M 0.07% Add
Geode Capital Management history 953.98K $124.10M 0.01% Add
Morgan Stanley history 920.74K $119.75M 0.01% Add
Capital Research Global Investors history 637.89K $82.96M 0.01% Reduce
Goldman Sachs Group history 636.70K $82.81M 0.01% Reduce
UBS Group AG history 599.27K $77.94M 0.01% Add
Viking Global Investors history 514.34K $66.90M 0.18% Reduce
Northern Trust Corp history 380.46K $49.48M 0.01% Reduce
Norges Bank Investment Management history 377.42K $49.09M 0.01% Add
Baron Funds history 373.90K $48.63M 0.13% Reduce
Charles Schwab Investment Management history 361.90K $47.07M 0.01% Reduce
Invesco Ltd history 319.31K $41.53M 0.01% Reduce
BNY Mellon history 308.49K $40.12M 0.01% Reduce
Bank of America Corp history 284.70K $37.03M 0.00% Reduce
Marshall Wace history 219.31K $28.52M 0.03% Add
Millennium Management history 187.97K $24.45M 0.01% Add
Citigroup Inc history 121.23K $15.77M 0.01% Add
JPMorgan Chase & Co history 117.80K $15.32M 0.00% Add
Principal Global Investors history 97.86K $12.73M 0.01% Reduce
Legal & General Investment Management America history 92.44K $12.02M 0.00% Reduce
D. E. Shaw & Co history 66.02K $8.59M 0.01% New
Renaissance Technologies history 59.90K $7.79M 0.01% New
Citadel Advisors history 51.25K $6.67M 0.00% Reduce
Amundi US history 43.86K $5.70M 0.00% Reduce
CPP Investments history 38.50K $5.01M 0.00% Add
Manulife Financial history 33.18K $4.32M 0.00% Reduce
Janus Henderson Group history 20.00K $2.60M 0.00% Hold
Wells Fargo & Co history 18.70K $2.43M 0.00% Add
Wellington Management Group history 7.83K $1.02M 0.00% Add
PNC Financial Services history 7.29K $947.75K 0.00% Hold
Deutsche Bank AG history 6.74K $876.08K 0.00% Add
Franklin Resources history 4.38K $570.18K 0.00% Reduce
Prudential Financial history 1.96K $256.63K 0.00% Reduce
Bridgewater Associates history 1.62K $210.57K 0.00% Reduce
T. Rowe Price Associates history 213.59K $27.78K 0.00% Reduce
First Eagle Investment Management history 28 $3.64K 0.00% New

Q3 2025 — 36 funds

FundSharesValuePortfolio WeightChange
BlackRock Inc history 10.36M $1.53B 0.03% Reduce
Fidelity Management & Research (FMR) history 8.21M $1.21B 0.07% Hold
Vanguard Group history 4.81M $709.72M 0.01% Add
MFS Investment Management history 2.62M $386.58M 0.12% Add
Capital Research Global Investors history 1.85M $273.58M 0.05% Hold
Viking Global Investors history 1.07M $158.39M 0.41% Add
Geode Capital Management history 942.44K $139.08M 0.01% Add
Goldman Sachs Group history 744.40K $109.84M 0.01% Add
Morgan Stanley history 690.60K $101.90M 0.01% Reduce
Bank of America Corp history 405.06K $59.77M 0.00% Add
Northern Trust Corp history 392.14K $57.86M 0.01% Add
Baron Funds history 388.75K $57.36M 0.15% Add
Charles Schwab Investment Management history 364.46K $53.78M 0.01% Reduce
Invesco Ltd history 321.36K $47.42M 0.01% Add
BNY Mellon history 312.62K $46.13M 0.01% Reduce
UBS Group AG history 169.80K $25.05M 0.00% Add
Marshall Wace history 134.12K $19.79M 0.02% Add
Citigroup Inc history 116.67K $17.21M 0.01% Add
JPMorgan Chase & Co history 107.94K $15.93M 0.00% Reduce
Legal & General Investment Management America history 102.68K $15.15M 0.00% Reduce
Principal Global Investors history 102.18K $15.08M 0.01% Hold
Citadel Advisors history 101.15K $14.92M 0.00% Add
Amundi US history 84.89K $12.58M 0.00% Add
Manulife Financial history 34.19K $5.05M 0.00% Reduce
AQR Capital Management history 31.03K $4.44M 0.00% Reduce
Janus Henderson Group history 20.00K $2.95M 0.00% Hold
Wells Fargo & Co history 17.28K $2.55M 0.00% Reduce
Millennium Management history 16.13K $2.38M 0.00% Add
CPP Investments history 15.80K $2.33M 0.00% Hold
PNC Financial Services history 7.25K $1.07M 0.00% Add
Deutsche Bank AG history 6.61K $974.57K 0.00% Add
Franklin Resources history 4.70K $692.90K 0.00% Reduce
Prudential Financial history 3.72K $549.18K 0.00% Reduce
Wellington Management Group history 2.19K $323.73K 0.00% Reduce
Bridgewater Associates history 1.71K $252.90K 0.00% Add
T. Rowe Price Associates history 514.95K $75.98K 0.01% Add

Q2 2025 — 41 funds

FundSharesValuePortfolio WeightChange
BlackRock Inc history 10.51M $1.77B 0.04% Add
Fidelity Management & Research (FMR) history 8.18M $1.38B 0.08% Hold
Vanguard Group history 4.64M $780.23M 0.01% Add
MFS Investment Management history 2.47M $415.57M 0.13% Add
Capital Research Global Investors history 1.86M $312.16M 0.06% Reduce
Geode Capital Management history 896.42K $150.82M 0.01% Add
Viking Global Investors history 767.43K $129.10M 0.37% New
Morgan Stanley history 767.38K $129.09M 0.01% Add
Goldman Sachs Group history 471.52K $79.32M 0.01% Add
Northern Trust Corp history 388.54K $65.36M 0.01% Add
Baron Funds history 384.59K $64.70M 0.18% Add
Charles Schwab Investment Management history 370.73K $62.36M 0.01% Reduce
BNY Mellon history 317.59K $53.43M 0.01% Reduce
Invesco Ltd history 237.30K $39.92M 0.01% Reduce
Bank of America Corp history 190.18K $31.99M 0.00% Reduce
UBS Group AG history 142.16K $23.91M 0.00% Reduce
JPMorgan Chase & Co history 138.09K $23.23M 0.00% Reduce
Legal & General Investment Management America history 104.36K $17.56M 0.00% Add
Principal Global Investors history 102.47K $17.24M 0.01% Hold
Manulife Financial history 58.71K $9.88M 0.01% Add
Fidelity International (FIL) history 56.33K $9.48M 0.01% Reduce
AQR Capital Management history 50.26K $8.45M 0.01% Add
Citigroup Inc history 49.96K $8.40M 0.00% Reduce
Amundi US history 41.58K $7.12M 0.00% Add
Norges Bank Investment Management history 39.05K $6.57M 0.00% Add
Citadel Advisors history 34.08K $5.73M 0.00% Reduce
Renaissance Technologies history 25.38K $4.27M 0.01% Add
Point72 Asset Management history 24.22K $4.07M 0.01% Reduce
Janus Henderson Group history 20.00K $3.36M 0.00% Hold
Wells Fargo & Co history 18.19K $3.06M 0.00% Reduce
CPP Investments history 15.80K $2.66M 0.00% Hold
Two Sigma Investments history 15.46K $2.60M 0.01% Reduce
Marshall Wace history 7.21K $1.21M 0.00% Reduce
PNC Financial Services history 6.40K $1.08M 0.00% Add
Deutsche Bank AG history 6.31K $1.06M 0.00% Hold
Franklin Resources history 4.90K $824.61K 0.00% Reduce
Millennium Management history 3.91K $657.24K 0.00% Reduce
Prudential Financial history 3.87K $651.35K 0.00% Add
Wellington Management Group history 3.27K $549.41K 0.00% Add
Bridgewater Associates history 1.65K $276.72K 0.00% Reduce
T. Rowe Price Associates history 405.46K $68.21K 0.01% Add

Q1 2025 — 39 funds

FundSharesValuePortfolio WeightChange
BlackRock Inc history 9.87M $1.64B 0.04% Add
Fidelity Management & Research (FMR) history 8.18M $1.36B 0.09% Add
Vanguard Group history 4.58M $763.57M 0.01% Hold
Capital Research Global Investors history 2.06M $342.55M 0.07% Reduce
MFS Investment Management history 1.97M $327.84M 0.11% Add
Geode Capital Management history 844.32K $140.70M 0.01% Add
Morgan Stanley history 735.78K $122.58M 0.01% Hold
Northern Trust Corp history 383.36K $63.87M 0.01% Hold
Charles Schwab Investment Management history 377.07K $62.82M 0.01% Hold
BNY Mellon history 332.11K $55.33M 0.01% Reduce
Baron Funds history 317.28K $52.86M 0.16% Add
Bank of America Corp history 316.64K $52.75M 0.00% Add
Point72 Asset Management history 315.42K $52.55M 0.12% Add
Goldman Sachs Group history 280.25K $46.69M 0.01% Add
Invesco Ltd history 261.36K $43.54M 0.01% Reduce
JPMorgan Chase & Co history 246.49K $41.07M 0.01% Add
UBS Group AG history 190.18K $31.68M 0.01% Add
Fidelity International (FIL) history 169.79K $28.29M 0.03% Add
Millennium Management history 144.81K $24.12M 0.01% Reduce
Principal Global Investors history 102.66K $17.10M 0.01% Hold
Legal & General Investment Management America history 99.54K $16.58M 0.01% Add
Citadel Advisors history 62.28K $10.38M 0.00% Reduce
Manulife Financial history 53.90K $8.98M 0.01% Add
Citigroup Inc history 52.16K $8.69M 0.01% Reduce
Amundi US history 41.17K $6.27M 0.00% Reduce
Two Sigma Investments history 25.16K $4.19M 0.01% Reduce
Janus Henderson Group history 20.00K $3.27M 0.00% Reduce
Wells Fargo & Co history 18.52K $3.08M 0.00% Reduce
CPP Investments history 15.80K $2.63M 0.00% Reduce
Renaissance Technologies history 15.00K $2.50M 0.00% New
Franklin Resources history 12.29K $2.05M 0.00% Add
Marshall Wace history 10.97K $1.83M 0.00% Reduce
AQR Capital Management history 8.14K $1.30M 0.00% Add
Deutsche Bank AG history 6.31K $1.05M 0.00% Add
PNC Financial Services history 5.68K $946.96K 0.00% Add
Prudential Financial history 3.19K $531.45K 0.00% Add
Bridgewater Associates history 2.12K $352.86K 0.00% Reduce
Wellington Management Group history 1.30K $216.08K 0.00% New
T. Rowe Price Associates history 282.64K $47.09K 0.01% Add

Q4 2024 — 40 funds

FundSharesValuePortfolio WeightChange
BlackRock Inc history 8.70M $1.44B 0.03% Reduce
Fidelity Management & Research (FMR) history 8.10M $1.34B 0.08% Add
Vanguard Group history 4.59M $758.18M 0.01% Add
Capital Research Global Investors history 2.45M $405.81M 0.08% Add
MFS Investment Management history 1.74M $286.82M 0.09% Add
Geode Capital Management history 801.12K $132.47M 0.01% Add
Morgan Stanley history 737.84K $121.97M 0.01% Hold
Citadel Advisors history 470.43K $77.76M 0.01% Add
Millennium Management history 433.06K $71.58M 0.04% Add
Farallon Capital Management history 397.00K $65.62M 0.33% Reduce
Northern Trust Corp history 383.87K $63.45M 0.01% Add
Charles Schwab Investment Management history 377.84K $62.46M 0.01% Add
BNY Mellon history 337.22K $55.74M 0.01% Reduce
Baron Funds history 307.14K $50.77M 0.13% Reduce
Point72 Asset Management history 298.50K $49.34M 0.11% Add
Invesco Ltd history 277.96K $45.95M 0.01% Add
Goldman Sachs Group history 202.25K $33.43M 0.01% Reduce
UBS Group AG history 160.03K $26.45M 0.01% Add
JPMorgan Chase & Co history 128.64K $21.26M 0.00% Add
Amundi US history 111.48K $18.82M 0.01% Add
Fidelity International (FIL) history 110.33K $18.24M 0.02% Add
Bank of America Corp history 107.30K $17.74M 0.00% Reduce
Principal Global Investors history 102.66K $16.97M 0.01% Hold
Legal & General Investment Management America history 97.19K $16.07M 0.00% Reduce
Citigroup Inc history 91.69K $15.16M 0.01% Reduce
Manulife Financial history 51.46K $8.51M 0.01% Add
Two Sigma Investments history 39.89K $6.59M 0.01% Reduce
Norges Bank Investment Management history 33.39K $5.52M 0.00% Reduce
Janus Henderson Group history 21.00K $3.47M 0.00% Reduce
Wells Fargo & Co history 19.74K $3.26M 0.00% Reduce
CPP Investments history 16.10K $2.66M 0.00% Reduce
Marshall Wace history 13.29K $2.20M 0.00% New
Bridgewater Associates history 11.39K $1.88M 0.01% Add
Deutsche Bank AG history 6.22K $1.03M 0.00% Add
PNC Financial Services history 4.68K $774.43K 0.00% Add
AQR Capital Management history 3.44K $568.96K 0.00% Reduce
Franklin Resources history 2.92K $483.50K 0.00% Add
Prudential Financial history 2.45K $405.15K 0.00% Reduce
T. Rowe Price Associates history 250.79K $41.46K 0.01% Add
Lazard Asset Management history 10 $1 0.00% Reduce

View all 54 fund holders →

New Positions (latest)

No fund opened a new position this quarter.

Fully Exited (vs previous quarter)

No tracked fund fully exited this quarter.

Fund Position History — shares by quarter (top 20 funds)

FundQ1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q3 2023Q2 2023Q1 2023Q4 2022Q3 2022Q2 2022Q1 2022Q4 2021Q3 2021Q2 2021
BlackRock Inc 4.64M 8.86M 10.36M 10.51M 9.87M 8.70M 8.82M — — — — — — — — — — — — —
MFS Investment Management 2.34M 2.66M 2.62M 2.47M 1.97M 1.74M 792.17K 721.73K 1.72M 1.61M 1.51M — — — — — — 855.58K 845.74K 853.86K
Fidelity Management & Research (FMR) 1.45M 7.86M 8.21M 8.18M 8.18M 8.10M 6.76M 4.79M 6.98M 6.93M 5.25M 7.16M 6.08M 5.46M 3.86M 2.10M 2.07M 2.05M 2.08M —
Millennium Management 1.28M 187.97K 16.13K 3.91K 144.81K 433.06K 62.35K 756.04K 352.32K 216.46K 385.60K 233.98K 402.55K 205.94K 557.63K 767.76K 1.02M 300.74K 89.99K —
Goldman Sachs Group 984.19K 636.70K 744.40K 471.52K 280.25K 202.25K 332.08K 135.09K 122.45K 175.51K 124.94K 67.94K 62.05K 274.06K 728.63K 856.66K 445.87K 260.05K 159.66K —
Geode Capital Management 956.74K 953.98K 942.44K 896.42K 844.32K 801.12K 792.89K 780.90K 754.16K 723.94K 699.75K 758.61K 726.02K 703.20K 671.53K 695.01K 686.38K 662.77K 648.82K —
Balyasny Asset Management 856.09K — — — — — — 135.72K 255.51K 409.94K 614.43K 121.79K 87.43K 114.34K 16.50K — 57.91K — — —
AQR Capital Management 831.97K 1.09M 31.03K 50.26K 8.14K 3.44K 16.22K — — — — 5.10K 13.60K — 4.01K 391.74K 205.38K 51.31K 51.72K —
Morgan Stanley 752.42K 920.74K 690.60K 767.38K 735.78K 737.84K 736.86K 475.80K 471.46K 458.02K 501.90K 270.70K 311.26K 483.25K 695.84K 1.38M 490.42K 162.67K 159.49K —
Citigroup Inc 533.39K 121.23K 116.67K 49.96K 52.16K 91.69K 121.79K 44.72K 55.92K 52.61K 53.58K 64.91K 121.14K 119.15K 623.85K 555.04K 551.93K 292.07K 292.99K —
Fidelity International (FIL) 482.00K — — 56.33K 169.79K 110.33K 105.71K 76.15K 73.19K 216.47K 117.47K — — — — — — — — —
UBS Group AG 468.26K 599.27K 169.80K 142.16K 190.18K 160.03K 54.68K 43.86K 43.75K 32.12K 66.67K 81.59K 94.92K 96.66K 89.40K 101.78K 205.10K 211.93K 208.21K —
Northern Trust Corp 390.44K 380.46K 392.14K 388.54K 383.36K 383.87K 301.04K 317.30K 277.45K 347.35K 333.78K 417.54K 462.73K 461.64K 467.83K 503.52K 554.86K 559.68K 567.79K —
Charles Schwab Investment Management 386.90K 361.90K 364.46K 370.73K 377.07K 377.84K 370.03K 393.29K 378.38K 368.04K 347.52K 357.13K 357.87K 353.65K 333.62K 335.42K 317.11K 302.42K 293.77K —
Capital Research Global Investors 359.06K 637.89K 1.85M 1.86M 2.06M 2.45M 1.36M 1.06M 2.27M 2.27M 2.13M 1.65M 1.65M 950.72K — — — — — —
Citadel Advisors 332.77K 51.25K 101.15K 34.08K 62.28K 470.43K 253.75K 293.79K 1.43M 1.07M 889.19K 75.73K 206.82K 84.61K 201.02K 153.16K 197.85K 74.12K 45.85K —
BNY Mellon 306.40K 308.49K 312.62K 317.59K 332.11K 337.22K 341.96K 389.76K 390.93K 415.83K 390.62K 497.17K 523.46K 538.35K 542.37K 710.51K 588.80K 725.61K 766.99K —
Amundi US 243.14K 43.86K 84.89K 41.58K 41.17K 111.48K 24.04K — 2 6.41K 7.17K 57.32K 71.43K 114.51K 105.57K 99.50K 103.00K 104.07K 99.43K —
Renaissance Technologies 239.50K 59.90K — 25.38K 15.00K — — — — — — 41.23K 81.30K 179.70K 47.80K — — 6.20K — —
Bank of America Corp 232.00K 284.70K 405.06K 190.18K 316.64K 107.30K 117.84K 115.03K 130.29K 19.63K 32.26K 19.18K 63.33K 23.42K 22.40K 52.09K 78.40K 151.12K 194.15K —

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