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Disclosery

MASI MASIMO CORP

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Stock (common)

350 managers (358 13F filers) reported a position in MASI shares at 2025-09-30, 56,209,754 shares in all. 44 filers opened a position and 64 filers sold out during the quarter.

Managers
350
13F filers
358
New
44
Added
120
Reduced
121
Sold out
64
Shares held by filers
56,209,754

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q3 2025

Filers in the available 13F reports with a share position at 2025-09-30, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
BlackRock, Inc.in group BlackRock, Inc.10,361,091$1.53B0.03%-146,23513F-HRTimelineGroup
FMR LLCin group FMR LLC8,213,721$1.21B0.06%+32,34913F-HRTimelineGroup
VANGUARD GROUP INCgroup of 2 filers holding4,816,804$711M+172,228Timeline
Politan Capital Management LP4,589,648$677M61.54%-126,88813F-HRTimeline
MASSACHUSETTS FINANCIAL SERVICES CO /MA/in group MASSACHUSETTS FINANCIAL SERVI…2,619,960$387M0.12%+149,56713F-HRTimelineGroup
T. Rowe Price Investment Management, In…2,126,763$314M0.19%-373,38113F-HRTimeline
Capital Research Global Investorsin group Capital Research Global Inves…1,854,128$274M0.05%-1,54213F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP1,484,471$219M0.01%-1,92313F-HRTimelineGroup
WESTFIELD CAPITAL MANAGEMENT CO LP1,419,250$209M0.88%+238,04713F-HRTimeline
Alyeska Investment Group, L.P.in group Alyeska Investment Group, L.P.1,381,085$204M0.62%+246,59513F-HRTimelineGroup
VIKING GLOBAL INVESTORS LPin group VIKING GLOBAL INVESTORS LP1,073,433$158M0.41%+306,00713F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC942,439$139M0.01%+46,02113F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC744,402$110M0.02%+272,87713F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY690,601$102M0.01%-76,77413F-HR/ATimelineGroup
RTW INVESTMENTS, LP683,294$101M1.24%013F-HRTimeline
Liontrust Investment Partners LLP681,895$101M1.47%-26,40513F-HR/ATimeline
Squarepoint Ops LLCin group Squarepoint Ops LLC620,932$91.6M0.19%+546,90513F-HRTimelineGroup
Durable Capital Partners LP620,619$91.6M0.68%-543,27913F-HRTimeline
PRICE T ROWE ASSOCIATES INC /MD/514,946$76M0.01%+109,48613F-HRTimeline
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC460,951$68M0.02%+66,46413F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/405,061$59.8M<0.01%+214,88513F-HR/ATimelineGroup
Sumitomo Mitsui Trust Group, Inc.in group Sumitomo Mitsui Trust Group, …397,248$58.6M0.03%-73,79313F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP392,142$57.9M0.01%+3,60013F-HRTimelineGroup
BAMCO INC /NY/in group Baron Capital388,747$57.4M0.15%+4,15813F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co364,457$53.8M0.01%-6,27713F-HRTimelineGroup
Corient Private Wealth LPgroup of 2 filers holding337,715$49.8M+5,801Timeline
SCHRODER INVESTMENT MANAGEMENT GROUP336,650$48.1M0.04%-111,85113F-HRTimeline
Invesco Ltd.in group Invesco Ltd.321,363$47.4M0.01%+84,06013F-HRTimelineGroup
Bank of New York Mellon Corpin group Bank of New York Mellon Corp312,618$46.1M0.01%-4,97513F-HRTimelineGroup
UBS Group AGgroup of 2 filers holding278,910$41.2M-72,817Timeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP259,668$38.3M0.01%-263,55813F-HRTimelineGroup
Grantham, Mayo, Van Otterloo & Co. LLC242,822$35.8M0.1%+2,25913F-HRTimeline
COMERICA BANK233,427$34.4M0.13%+43,60513F-HRTimeline
Nuveen, LLCin group TIAA225,712$33.3M0.01%+76,05413F-HRTimelineGroup
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC196,021$28.9M0.01%-4,20813F-HRTimelineGroup
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC168,341$24.8M0.01%+16,11313F-HRTimelineGroup
BNP PARIBAS ASSET MANAGEMENT Holding S.…in group BNP PARIBAS ASSET MANAGEMENT …164,926$24.3M0.06%+99,10513F-HRTimelineGroup
Erste Asset Management GmbHin group Erste Asset Management GmbH160,000$22.9M0.22%+68,00013F-HRTimelineGroup
ADAGE CAPITAL PARTNERS GP, L.L.C.in group ADAGE CAPITAL PARTNERS GP, L.…150,000$22.1M0.04%new13F-HRTimelineGroup
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…147,428$21.8M0.04%+31,80213F-HRTimelineGroup
MARSHALL WACE, LLPin group MARSHALL WACE, LLP134,122$19.8M0.02%+126,91413F-HRTimelineGroup
Tidal Investments LLCin group Tidal Investments LLC132,557$19.6M0.08%+26,35913F-HRTimelineGroup
Gotham Asset Management, LLC129,026$19M0.08%-36,33013F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA127,117$18.8M<0.01%+17,42713F-HRTimelineGroup
RHUMBLINE ADVISERS126,608$18.7M0.02%-88813F-HRTimeline
GW&K Investment Management, LLC124,047$18.3M0.16%+123,91213F-HRTimeline
CITIGROUP INCin group CITIGROUP INC116,672$17.2M0.01%+66,71013F-HRTimelineGroup
GAMCO Investors (Gabelli)group of 2 filers holding116,500$17.2M-700Timeline
CRAMER ROSENTHAL MCGLYNN LLC114,605$16.9M1.09%+19,66613F-HRTimeline
DF DENT & CO INC108,653$16M0.21%new13F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO107,941$15.9M<0.01%-30,14913F-HR/ATimelineGroup
TD Asset Management Inc107,858$15.9M0.01%-59,31813F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc102,677$15.1M<0.01%-1,68713F-HRTimelineGroup
PRINCIPAL FINANCIAL GROUP INCgroup of 2 filers holding102,191$15.1M-280Timeline
Alpha Wave Global, LP97,102$14.3M1.45%-4,96613F-HRTimeline
Bellevue Group AGin group Bellevue Group AG96,968$14.3M0.3%+7,29513F-HRTimelineGroup
Walleye Capital LLCin group Walleye Capital LLC89,363$13.2M0.11%+46,13113F-HRTimelineGroup
Swiss National Bank89,300$13.2M0.01%+1,60013F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC87,750$12.9M0.01%+63,47313F-HRTimelineGroup
Amundiin group Amundi84,894$12.6M<0.01%+43,31113F-HRTimelineGroup
JUPITER ASSET MANAGEMENT LTDin group JUPITER ASSET MANAGEMENT LTD84,657$12.5M0.11%new13F-HRTimelineGroup
California Public Employees Retirement …78,460$11.6M0.01%+5,65313F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC77,804$11.5M<0.01%+21,69013F-HR/ATimelineGroup
Swedbank ABin group Swedbank AB67,500$9.96M0.01%-6,30013F-HRTimelineGroup
BLI - Banque de Luxembourg Investments68,500$9.79M0.29%-18,20013F-HRTimeline
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP61,934$9.14M0.01%-37,67813F-HRTimelineGroup
Retirement Systems of Alabama55,831$8.24M0.03%+82813F-HRTimeline
ALLIANCEBERNSTEIN L.P.53,561$7.9M<0.01%-790,50613F-HRTimeline
BRIDGER MANAGEMENT, LLC47,841$7.06M3.8%+14,20013F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…43,355$6.4M0.01%+213F-HRTimeline
NS Partners Ltd42,394$6.26M0.24%-17213F-HRTimeline
STATE BOARD OF ADMINISTRATION OF FLORID…41,079$6.06M0.01%-2,24013F-HRTimeline
NEW YORK STATE TEACHERS RETIREMENT SYST…40,048$5.91M0.01%013F-HRTimeline
Quantinno Capital Management LP39,589$5.84M0.02%-80,79413F-HRTimeline
STRS OHIO36,913$5.45M0.02%-19,07013F-HRTimeline
Baird Financial Group, Inc.in group Baird Financial Group, Inc.35,834$5.29M0.01%-4,88613F-HRTimelineGroup
CAPITAL FUND MANAGEMENT S.A.34,424$5.08M0.05%new13F-HRTimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …34,193$5.05M<0.01%-24,52113F-HRTimelineGroup
VICTORY CAPITAL MANAGEMENT INC33,045$4.88M<0.01%+3,67713F-HRTimeline
NORDEA INVESTMENT MANAGEMENT ABin group NORDEA INVESTMENT MANAGEMENT …32,499$4.69M<0.01%+63113F-HRTimelineGroup
TUDOR INVESTMENT CORP ET AL31,641$4.67M0.03%new13F-HR/ATimeline
Engineers Gate Manager LP30,773$4.54M0.05%+23,90013F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC31,034$4.44M<0.01%-19,22213F-HRTimelineGroup
INTECH INVESTMENT MANAGEMENT LLC29,690$4.38M0.04%-2,06013F-HRTimeline
Onex Canada Asset Management Inc.27,923$4.12M0.52%+19,69913F-HRTimeline
STOREBRAND ASSET MANAGEMENT AS27,732$4.09M0.01%+10,00013F-HRTimeline
Ensign Peak Advisors, Inc27,361$4.04M0.01%+11,38513F-HR/ATimeline
WILSON ASSET MANAGEMENT (INTERNATIONAL)…27,234$4.02M0.99%013F-HRTimeline
CANADA LIFE ASSURANCE Coin group CANADA LIFE ASSURANCE Co27,120$3.87M0.01%+1,00013F-HRTimelineGroup
MetLife Investment Management, LLCin group MetLife Investment Management…25,849$3.81M0.02%-43613F-HRTimelineGroup
LOGAN CAPITAL MANAGEMENT INC25,105$3.7M0.16%-6,24713F-HRTimeline
Westmount Partners, LLC25,866$3.69M0.95%013F-HRTimeline
Advisors Asset Management, Inc.24,188$3.57M0.06%-19513F-HR/ATimeline
NEW YORK STATE COMMON RETIREMENT FUND24,160$3.56M<0.01%013F-HRTimeline
South Dakota Investment Council23,068$3.4M0.07%-1,70013F-HRTimeline
AMALGAMATED BANK22,601$3.33M0.02%+85813F-HRTimeline
STATE OF WISCONSIN INVESTMENT BOARD21,738$3.21M0.01%+9413F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO21,655$3.2M<0.01%-8,85113F-HRTimelineGroup
MUTUAL OF AMERICA CAPITAL MANAGEMENT LLCin group MUTUAL OF AMERICA CAPITAL MAN…21,325$3.15M0.03%-1,05413F-HRTimelineGroup
Cardinal Capital Management21,180$3.13M0.43%+94313F-HRTimeline
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC21,142$3.12M<0.01%-6,09213F-HRTimelineGroup
ING GROEP NV20,800$3.07M0.02%new13F-HRTimeline
Treasurer of the State of North Carolina20,268$2.99M0.01%-78513F-HRTimeline
JANUS HENDERSON GROUP PLCin group Janus Henderson20,000$2.95M<0.01%013F-HRTimelineGroup
Police & Firemen's Retirement System of…19,995$2.95M0.02%+3,05213F-HRTimeline
COMMERCE BANKin group COMMERCE BANK18,891$2.79M0.02%-53913F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN17,280$2.55M<0.01%-90913F-HRTimelineGroup
Entropy Technologies, LP16,809$2.48M0.19%+8,80913F-HRTimeline
KAYNE ANDERSON RUDNICK INVESTMENT MANAG…16,757$2.47M0.01%+16,75213F-HRTimeline
State of New Jersey Common Pension Fund…in group State of New Jersey Common Pe…16,652$2.46M0.01%+78513F-HRTimelineGroup
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC16,131$2.38M<0.01%+12,22413F-HRTimelineGroup
CANADA PENSION PLAN INVESTMENT BOARD15,800$2.33M<0.01%013F-HRTimeline
Illinois Municipal Retirement Fund15,565$2.3M0.03%+3,14513F-HRTimeline
BROWN ADVISORY INCin group BROWN ADVISORY INC15,533$2.29M<0.01%+113F-HRTimelineGroup
LANDSCAPE CAPITAL MANAGEMENT, L.L.C.in group LANDSCAPE CAPITAL MANAGEMENT,…15,292$2.26M0.14%+8,26313F-HRTimelineGroup
ADAR1 Capital Management, LLCin group ADAR1 Capital Management, LLC15,000$2.21M0.22%new13F-HRTimelineGroup
YOUSIF CAPITAL MANAGEMENT, LLC14,884$2.2M0.02%-75713F-HRTimeline
Thrivent Financial for Lutheransin group Thrivent Financial for Luther…14,851$2.19M<0.01%+4,25513F-HRTimelineGroup
TEACHERS RETIREMENT SYSTEM OF THE STATE…14,771$2.18M0.02%013F-HRTimeline
State of Tennessee, Department of Treas…14,514$2.14M0.01%-3,65613F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS14,507$2.14M<0.01%+10,02413F-HRTimelineGroup
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF O…14,396$2.12M0.01%+6413F-HRTimeline
Empower Advisory Group, LLCin group Empower Annuity Insurance Co …14,105$2.08M0.01%+4513F-HRTimelineGroup
ARIZONA STATE RETIREMENT SYSTEM13,609$2.01M0.01%+22413F-HRTimeline
Montanaro Asset Management Ltd12,960$1.91M0.48%-9,90013F-HRTimeline
Louisiana State Employees Retirement Sy…12,900$1.9M0.03%+20013F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…12,859$1.9M<0.01%+1,79713F-HRTimelineGroup
Handelsbanken Fonder AB12,330$1.82M0.01%013F-HRTimeline
Mitsubishi UFJ Trust & Banking Corpgroup of 2 filers holding12,152$1.79M-167Timeline
Quantitative Investment Management, LLC12,025$1.77M0.25%new13F-HRTimeline
PICTON MAHONEY ASSET MANAGEMENT11,970$1.77M0.02%-32,58713F-HRTimeline
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCH…11,851$1.75M0.01%+28913F-HRTimeline
LOCKERMAN FINANCIAL GROUP, INC.11,800$1.74M2.19%-1,30013F-HRTimeline
PARADIGM CAPITAL MANAGEMENT INC/NY11,353$1.68M0.07%013F-HRTimeline
Creative Planningin group Creative Planning11,034$1.63M<0.01%-13613F-HRTimelineGroup
STATE OF MICHIGAN RETIREMENT SYSTEM10,996$1.62M0.01%+20013F-HRTimeline
Schonfeld Strategic Advisors LLC10,884$1.61M0.01%-3,35513F-HRTimeline
Perpetual Ltdin group Perpetual Ltd10,648$1.57M0.02%-10,52413F-HRTimelineGroup
Sterling Capital Management LLC10,613$1.57M0.02%-12,65413F-HRTimeline
NORTHWESTERN MUTUAL INVESTMENT MANAGEME…group of 2 filers holding10,446$1.54M+247Timeline
DARK FOREST CAPITAL MANAGEMENT LP10,009$1.48M0.06%new13F-HR/ATimeline
HARBOR CAPITAL ADVISORS, INC.9,932$1.47M0.11%-16,48013F-HRTimeline
NEW MEXICO EDUCATIONAL RETIREMENT BOARD9,900$1.46M0.05%013F-HRTimeline
KLP KAPITALFORVALTNING AS9,800$1.45M0.01%+40013F-HRTimeline
XPONANCE LLC9,430$1.39M0.01%+22413F-HRTimeline
Verition Fund Management LLC9,403$1.39M0.01%-8,91013F-HRTimeline
OREGON PUBLIC EMPLOYEES RETIREMENT FUND9,274$1.37M0.02%+5513F-HRTimeline
Zurcher Kantonalbank (Zurich Cantonalba…9,190$1.36M<0.01%+33313F-HRTimeline
SG Americas Securities, LLC8,919$1.32M<0.01%-5,84713F-HRTimeline
Wilmington Savings Fund Society, FSB8,899$1.31M0.03%-1,05113F-HR/ATimeline
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…8,656$1.28M0.04%-8813F-HRTimelineGroup
Birchview Capital, LP8,280$1.22M0.92%013F-HRTimeline
DE BURLO GROUP INC8,052$1.19M0.14%-5013F-HRTimeline
LPL Financial LLC7,322$1.08M<0.01%+1813F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…7,252$1.07M<0.01%+85413F-HRTimelineGroup
Pathstone Holdings, LLCin group Pathstone Holdings, LLC6,960$1.03M<0.01%-13913F-HRTimelineGroup
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…6,841$1.01M<0.01%+16213F-HRTimelineGroup
Fieldview Capital Management, LLC6,812$1.01M0.16%new13F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\6,605$975K<0.01%+29313F-HRTimelineGroup
NAVELLIER & ASSOCIATES INC6,310$931K0.09%new13F-HRTimeline
OP Asset Management Ltd6,308$931K0.01%new13F-HR/ATimeline
Pacer Advisors, Inc.6,080$897K<0.01%new13F-HRTimeline
TEACHER RETIREMENT SYSTEM OF TEXAS6,033$890K<0.01%-5,63813F-HRTimeline
SHERBROOKE PARK ADVISERS LLC5,905$871K0.4%new13F-HRTimeline
Polymer Capital Management (US) LLC5,876$867K0.12%new13F-HRTimeline
Bayesian Capital Management, LP5,779$853K0.17%new13F-HRTimeline
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …5,772$852K<0.01%-86813F-HRTimelineGroup
Graham Capital Management, L.P.5,770$851K0.03%-4,71013F-HRTimeline
B.O.S.S. Retirement Advisors, LLC5,337$787K0.19%+513F-HRTimeline
Blueshift Asset Management, LLC5,330$786K0.24%new13F-HRTimeline
SteelPeak Wealth, LLC5,292$781K0.03%+1,22513F-HRTimeline
GUGGENHEIM CAPITAL LLCin group GUGGENHEIM CAPITAL LLC5,276$778K0.01%-39713F-HRTimelineGroup
OCCUDO QUANTITATIVE STRATEGIES LP5,148$760K0.09%+3,03313F-HRTimeline
FEDERATED HERMES, INC.in group FEDERATED HERMES, INC.5,113$754K<0.01%+91213F-HRTimelineGroup
State of Alaska, Department of Revenue5,047$744K0.01%-713F-HRTimeline
Malaga Cove Capital, LLC5,016$740K0.27%+2,19013F-HRTimeline
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/5,000$738K<0.01%-56313F-HRTimelineGroup
NEUBERGER BERMAN GROUP LLCin group NEUBERGER BERMAN GROUP LLC4,900$723K<0.01%-16913F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…4,889$721K<0.01%-6,04613F-HRTimelineGroup
QUADRANT CAPITAL GROUP LLC4,881$720K0.02%-10013F-HRTimeline
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC4,876$719K<0.01%-14,70513F-HRTimelineGroup
STIFEL FINANCIAL CORPin group STIFEL FINANCIAL CORP4,700$693K<0.01%new13F-HRTimelineGroup
FRANKLIN RESOURCES INCin group Franklin Resources4,696$693K<0.01%-20613F-HRTimelineGroup
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION…4,685$691K<0.01%013F-HRTimeline
Laird Norton Wetherby Wealth Management…4,603$679K0.03%+4613F-HRTimeline
NEOS Investment Management LLC4,482$661K<0.01%+53313F-HRTimeline
Tema ETFs LLC4,482$661K0.05%+53313F-HRTimeline
Eukles Asset Management4,438$655K0.25%-41513F-HRTimeline
EXCHANGE TRADED CONCEPTS, LLC4,329$639K0.01%+99113F-HRTimeline
Private Advisor Group, LLC4,246$626K<0.01%+213F-HRTimeline
HighTower Advisors, LLC4,153$613K<0.01%+26413F-HRTimeline
Bryce Point Capital, LLC4,135$610K0.74%-75013F-HRTimeline
Caprock Group, LLC4,244$593K0.01%13F-HRTimeline
PharVision Advisers, LLC3,909$577K0.32%new13F-HRTimeline
Vestcor Inc3,825$564K0.02%013F-HRTimeline
NorthCoast Asset Management LLC3,821$564K<0.01%-57513F-HRTimeline
Avior Wealth Management, LLC3,812$562K0.02%+39613F-HRTimeline
US BANCORP \DE\in group US BANCORP \DE\3,764$555K<0.01%-40613F-HRTimelineGroup
Summit Trail Advisors, LLC3,725$550K0.01%-3,43513F-HRTimeline
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC3,722$549K<0.01%-15013F-HRTimelineGroup