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Disclosery

MASI MASIMO CORP

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Stock (common)

433 managers (451 13F filers) reported a position in MASI shares at 2026-03-31, 54,617,693 shares in all. 125 filers opened a position and 72 filers sold out during the quarter.

Managers
433
13F filers
451
New
125
Added
140
Reduced
107
Sold out
72
Shares held by filers
54,617,693

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, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, 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.4,644,578$826M0.01%-4,211,04113F-HRTimelineGroup
Politan Capital Management LP4,589,648$816M82.89%013F-HRTimeline
VANGUARD GROUP INCgroup of 8 filers holding4,427,856$788M+4,420,333Timeline
Pentwater Capital Management LP3,176,000$565M4.01%new13F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC2,743,985$488M0.17%+2,685,62713F-HRTimelineGroup
HBK INVESTMENTS L P2,576,109$458M5.77%new13F-HRTimeline
MASSACHUSETTS FINANCIAL SERVICES CO /MA/in group MASSACHUSETTS FINANCIAL SERVI…2,342,790$417M0.14%-321,08513F-HRTimelineGroup
FMR LLCin group FMR LLC1,450,823$258M0.01%-6,413,34113F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP1,437,724$256M0.01%+22,52813F-HRTimelineGroup
AQR CAPITAL MANAGEMENT LLCgroup of 2 filers holding1,248,922$221M+157,596Timeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC988,853$176M0.13%+800,88813F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC984,192$175M0.02%+347,49413F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC956,736$170M0.01%+2,76013F-HRTimelineGroup
Balyasny Asset Management L.P.in group Balyasny Asset Management770,986$137M0.27%new13F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY752,417$134M0.01%-168,31813F-HRTimelineGroup
UBS Group AGgroup of 2 filers holding601,946$107M-116,292Timeline
Davidson Kempner Capital Management LP585,988$104M1.85%new13F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO572,645$102M0.01%+454,84713F-HR/ATimelineGroup
CITIGROUP INCin group CITIGROUP INC533,388$94.9M0.06%+412,15713F-HRTimelineGroup
SG Americas Securities, LLC522,824$93M0.1%+506,39513F-HRTimeline
FIL Ltdin group FIL Ltd482,000$85.7M0.07%new13F-HRTimelineGroup
FIRST TRUST ADVISORS LPgroup of 2 filers holding479,403$85.3M+477,062Timeline
HSBC HOLDINGS PLCin group HSBC HOLDINGS PLC473,434$84.3M0.05%new13F-HRTimelineGroup
Magnetar Financial LLCin group Magnetar Financial LLC427,081$76M0.77%+421,62613F-HRTimelineGroup
O'Connor Alternative Investments LLC412,903$73.4M3.85%13F-HRTimeline
NEUBERGER BERMAN GROUP LLCin group NEUBERGER BERMAN GROUP LLC403,309$71.7M0.05%+398,30313F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP390,437$69.4M0.01%+9,97313F-HRTimelineGroup
Squarepoint Ops LLCin group Squarepoint Ops LLC389,359$69.3M0.15%-194,38813F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co386,898$68.8M0.01%+25,00213F-HRTimelineGroup
Capital Research Global Investorsin group Capital Research Global Inves…359,058$63.9M0.01%-278,83613F-HRTimelineGroup
Gotham Asset Management, LLC341,468$60.7M0.19%-72613F-HRTimeline
WESTFIELD CAPITAL MANAGEMENT CO LP341,229$60.7M0.25%-1,180,82013F-HRTimeline
ALLIANCEBERNSTEIN L.P.455,354$59.2M0.02%+401,13113F-HRTimeline
Hudson Bay Capital Management LPin group Hudson Bay Capital Management…330,679$58.8M0.35%new13F-HRTimelineGroup
Corient Private Wealth LPgroup of 2 filers holding322,940$57.4M-17,290Timeline
Fort Baker Capital Management LP312,720$55.6M4.93%new13F-HRTimeline
NEXPOINT ASSET MANAGEMENT, L.P.in group NEXPOINT ASSET MANAGEMENT, L.…310,130$55.2M3.85%new13F-HRTimelineGroup
CAPITOLIS LIQUID GLOBAL MARKETS LLCin group CAPITOLIS LIQUID GLOBAL MARKE…309,102$55M0.35%13F-HRTimelineGroup
GAMCO Investors (Gabelli)group of 3 filers holding306,732$54.6M+191,032Timeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp306,400$54.5M0.01%-2,08513F-HRTimelineGroup
Qube Research & Technologies Ltd291,481$51.8M0.07%-2,05513F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC281,366$50M0.04%+238,31413F-HRTimelineGroup
WHITEBOX ADVISORS LLC270,001$48M0.68%new13F-HRTimeline
HRT FINANCIAL LP264,837$47.1M0.12%+172,06113F-HRTimeline
NUANCE INVESTMENTS, LLC244,704$43.5M6.07%new13F-HRTimeline
Amundiin group Amundi243,143$43.2M0.01%+199,28313F-HRTimelineGroup
Slotnik Capital, LLC240,300$42.7M12.7%new13F-HRTimeline
RENAISSANCE TECHNOLOGIES LLC239,500$42.6M0.07%+179,60013F-HRTimeline
Polar Asset Management Partners Inc.232,026$41.3M0.98%new13F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/232,003$41.3M<0.01%-52,69913F-HRTimelineGroup
Mitsubishi UFJ Trust & Banking Corpgroup of 2 filers holding228,958$40.7M+225,456Timeline
Beryl Capital Management LLC217,103$38.6M35.54%new13F-HRTimeline
CANADA PENSION PLAN INVESTMENT BOARD209,500$37.3M0.02%+171,00013F-HRTimeline
Erste Asset Management GmbHin group Erste Asset Management GmbH200,000$35.5M0.33%013F-HRTimelineGroup
WATER ISLAND CAPITAL LLC194,197$34.5M4.6%new13F-HRTimeline
ALPINE ASSOCIATES MANAGEMENT INC.189,000$33.6M1.98%new13F-HRTimeline
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC188,073$33.5M0.02%+9,31513F-HRTimelineGroup
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPin group ARROWSTREET CAPITAL, LIMITED …172,588$30.7M0.02%new13F-HRTimelineGroup
READYSTATE ASSET MANAGEMENT LP171,115$30.4M1.78%new13F-HRTimeline
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC170,527$30.3M0.01%-15,98313F-HRTimelineGroup
Man Group plcin group Man Group plc166,235$29.6M0.06%+18,81913F-HRTimelineGroup
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP164,402$29.2M0.01%-9,54813F-HRTimelineGroup
GLAZER CAPITAL, LLCin group GLAZER CAPITAL, LLC157,858$28.1M0.6%new13F-HRTimelineGroup
Woodline Partners LP153,234$27.3M0.1%new13F-HR/ATimeline
BANK OF NOVA SCOTIAin group BANK OF NOVA SCOTIA152,584$27.1M0.05%+147,33713F-HRTimelineGroup
TUDOR INVESTMENT CORP ET AL143,884$25.6M0.14%+127,64213F-HRTimeline
Capula Management Ltdin group Capula Management Ltd142,800$25.4M0.22%new13F-HRTimelineGroupThe filing omitted confidential holdings, a later amendment may add them.
Champlain Investment Partners, LLC141,284$25.1M0.32%new13F-HRTimeline
Westchester Capital Management, LLCin group Westchester Capital Managemen…138,428$24.6M1.19%new13F-HRTimelineGroup
Grantham, Mayo, Van Otterloo & Co. LLC137,617$24.5M0.06%-6,20813F-HRTimeline
TIG Advisors, LLCin group TIG Advisors, LLC135,197$24M1.15%new13F-HRTimelineGroup
RHUMBLINE ADVISERS129,619$23.1M0.02%+5,06313F-HRTimeline
GW&K Investment Management, LLC122,781$21.8M0.19%+3,41913F-HRTimeline
Sagefield Capital LPin group Sagefield Capital LP122,240$21.7M1.56%new13F-HRTimelineGroup
Schonfeld Strategic Advisors LLC117,297$20.9M0.17%-147,73913F-HRTimeline
WINTON GROUP Ltdin group WINTON GROUP Ltd112,783$20.1M0.7%new13F-HRTimelineGroup
Weiss Asset Management LPin group Weiss Asset Management LP112,600$20M0.37%new13F-HRTimelineGroupThe filing omitted confidential holdings, a later amendment may add them.
Nuveen, LLCin group TIAA111,542$19.8M0.01%-112,52613F-HRTimelineGroup
NOMURA ASSET MANAGEMENT CO LTDgroup of 2 filers holding109,510$19.5M+109,390Timeline
Blackstone Inc.in group Blackstone Inc.109,383$19.5M0.06%new13F-HRTimelineGroupThe filing omitted confidential holdings, a later amendment may add them.
PRINCIPAL FINANCIAL GROUP INCin group PRINCIPAL FINANCIAL GROUP INC102,718$18.3M0.01%+4,86013F-HRTimelineGroup
SOROS FUND MANAGEMENT LLCin group SOROS FUND MANAGEMENT LLC100,838$17.9M0.25%new13F-HRTimelineGroup
Kryger Capital LLC100,589$17.9M1.27%13F-HRTimeline
SCHRODER INVESTMENT MANAGEMENT GROUP96,179$17.1M0.01%-379,32513F-HRTimeline
MARSHALL WACE, LLPin group MARSHALL WACE, LLP90,657$16.1M0.02%-128,65513F-HRTimelineGroup
CIBRA Capital Ltd90,376$16.1M7.76%new13F-HRTimeline
Swiss National Bank90,300$16.1M0.01%-80013F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\89,387$15.9M0.01%+82,65113F-HRTimelineGroup
California Public Employees Retirement …77,397$13.8M0.01%+14,03813F-HRTimeline
VOLORIDGE INVESTMENT MANAGEMENT, LLC70,000$12.5M0.05%+30,44313F-HRTimeline
Invesco Ltd.in group Invesco Ltd.69,144$12.3M<0.01%-250,16413F-HRTimelineGroup
HEALTHCARE OF ONTARIO PENSION PLAN TRUS…67,600$12M0.02%new13F-HRTimeline
Verition Fund Management LLC66,853$11.9M0.12%+13,83313F-HRTimeline
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC65,203$11.6M<0.01%-403,20413F-HR/ATimelineGroup
PICTON MAHONEY ASSET MANAGEMENT65,000$11.6M0.12%+54,50013F-HRTimeline
Carmignac Gestion64,831$11.5M0.18%new13F-HRTimeline
WILSON ASSET MANAGEMENT (INTERNATIONAL)…63,984$11.4M3.21%+24,54713F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc62,545$11.1M<0.01%-29,89113F-HRTimelineGroup
Mariner, LLCin group Mariner, LLC61,265$10.9M0.01%+39,81613F-HRTimelineGroup
Retirement Systems of Alabama55,974$9.96M0.03%+1,17913F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…53,287$9.48M0.01%+9,46413F-HRTimeline
Tidal Investments LLCin group Tidal Investments LLC49,720$8.84M0.03%-35,57413F-HRTimelineGroup
CAXTON ASSOCIATES LLP45,917$8.17M0.19%new13F-HRTimeline
PRICE T ROWE ASSOCIATES INC /MD/45,830$8.15M<0.01%-167,76413F-HRTimeline
Lighthouse Investment Partners, LLCin group Lighthouse Investment Partner…42,851$7.62M0.29%new13F-HRTimelineGroup
NS Partners Ltd42,004$7.47M0.33%-34413F-HRTimeline
STATE BOARD OF ADMINISTRATION OF FLORID…39,654$7.05M0.01%-9513F-HRTimeline
Cerity Partners LLCin group Cerity Partners LLC38,820$6.9M0.01%+15,04613F-HRTimelineGroup
NEW YORK STATE TEACHERS RETIREMENT SYST…38,569$6.86M0.01%-1,47913F-HRTimeline
STRS OHIO37,213$6.62M0.03%+29813F-HRTimeline
Thrivent Financial for Lutheransin group Thrivent Financial for Luther…36,420$6.48M0.01%+13,24613F-HRTimelineGroup
Fortress Investment Group LLCin group Fortress Investment Group LLC35,900$6.39M1.63%new13F-HRTimelineGroup
BLI - Banque de Luxembourg Investments48,839$6.3M0.19%013F-HRTimeline
CWM, LLCin group CWM, LLC34,690$6.17M0.02%+16,15513F-HRTimelineGroup
Alberta Investment Management Corp34,107$6.07M0.04%new13F-HRTimeline
IEQ CAPITAL, LLC32,217$5.73M0.03%new13F-HRTimeline
Groupe la Francaisein group Groupe la Francaise31,950$5.68M0.08%new13F-HRTimelineGroup
Engineers Gate Manager LP30,423$5.41M0.07%-53,03513F-HRTimeline
Taconic Capital Advisors LPin group Taconic Capital Advisors LP30,000$5.34M3.65%new13F-HR/ATimelineGroup
Vestcor Inc30,000$5.34M0.15%+26,17513F-HRTimeline
TOKIO MARINE ASSET MANAGEMENT CO LTDin group TOKIO MARINE HOLDINGS, INC.29,400$5.23M0.19%new13F-HRTimelineGroup
STOREBRAND ASSET MANAGEMENT AS27,714$4.93M0.01%013F-HRTimeline
Quantbot Technologies LP27,425$4.88M0.2%-29,50013F-HRTimeline
CANADA LIFE ASSURANCE Coin group CANADA LIFE ASSURANCE Co26,443$4.71M0.01%-16713F-HRTimelineGroup
NATIXISin group Natixis Investment Managers25,495$4.53M0.02%+23,20913F-HRTimelineGroup
TPG GP A, LLCin group TPG GP A, LLC25,000$4.45M0.12%new13F-HRTimelineGroup
MetLife Investment Management, LLCin group MetLife Investment Management…24,485$4.36M0.02%+1313F-HRTimelineGroup
Westmount Partners, LLC24,232$4.31M1.06%013F-HRTimeline
NEW YORK STATE COMMON RETIREMENT FUND24,160$4.3M0.01%013F-HRTimeline
Centiva Capital, LP23,713$4.22M0.2%new13F-HRTimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …23,637$4.2M<0.01%-9,54713F-HRTimelineGroup
ABC ARBITRAGE SAin group ABC ARBITRAGE SA23,604$4.2M0.56%new13F-HRTimelineGroup
CREDIT INDUSTRIEL ET COMMERCIAL23,050$4.1M0.65%new13F-HRTimeline
Creative Planningin group Creative Planning22,920$4.08M<0.01%+5,81113F-HRTimelineGroup
Capricorn Fund Managers Ltd22,811$4.06M0.63%new13F-HRTimeline
Quantinno Capital Management LP22,501$4M0.01%+9,24813F-HRTimeline
New York Life Investment Management LLCin group New York Life Investment Mana…22,191$3.95M0.03%new13F-HRTimelineGroup
Cardinal Capital Management22,132$3.94M0.51%+67013F-HRTimeline
AMALGAMATED BANK21,832$3.88M0.03%+28113F-HRTimeline
ING GROEP NV21,700$3.86M0.02%new13F-HRTimeline
Liontrust Investment Partners LLP20,138$3.58M0.06%-607,65813F-HR/ATimeline
JANUS HENDERSON GROUP PLCin group Janus Henderson20,000$3.56M<0.01%013F-HR/ATimelineGroup
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.19,789$3.52M<0.01%-46,22713F-HRTimelineGroup
Police & Firemen's Retirement System of…19,484$3.47M0.03%013F-HRTimeline
Treasurer of the State of North Carolina19,294$3.43M0.01%+40813F-HRTimeline
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCH…18,940$3.37M0.02%+7,51513F-HRTimeline
MERCER GLOBAL ADVISORS INC /ADV18,139$3.23M<0.01%+7,27713F-HRTimeline
South Dakota Investment Council17,568$3.12M0.06%-3,70013F-HRTimeline
MUTUAL OF AMERICA CAPITAL MANAGEMENT LLCin group MUTUAL OF AMERICA CAPITAL MAN…17,496$3.11M0.04%-1,50513F-HRTimelineGroup
State of New Jersey Common Pension Fund…in group State of New Jersey Common Pe…16,320$2.9M0.01%-33213F-HRTimelineGroup
LMR Partners LLPin group LMR Partners LLP16,300$2.9M0.03%new13F-HRTimelineGroup
ExodusPoint Capital Management, LP15,979$2.84M0.03%+6,59413F-HRTimeline
P SCHOENFELD ASSET MANAGEMENT LP15,000$2.67M2.12%new13F-HRTimeline
ADAR1 Capital Management, LLCin group ADAR1 Capital Management, LLC15,000$2.67M0.16%013F-HRTimelineGroup
TEACHERS RETIREMENT SYSTEM OF THE STATE…14,771$2.63M0.02%013F-HRTimeline
BROWN ADVISORY INCin group BROWN ADVISORY INC14,734$2.62M<0.01%-12013F-HRTimelineGroup
Handelsbanken Fonder AB14,730$2.62M0.01%013F-HRTimeline
WEALTH ENHANCEMENT ADVISORY SERVICES, L…16,837$2.56M0.01%+5,46613F-HRTimeline
INTECH INVESTMENT MANAGEMENT LLC14,216$2.53M0.02%-10,54913F-HRTimeline
Baird Financial Group, Inc.in group Baird Financial Group, Inc.14,192$2.52M<0.01%-16,48713F-HRTimelineGroup
Empower Advisory Group, LLCin group Empower Annuity Insurance Co …14,105$2.51M0.01%+1,00013F-HRTimelineGroup
State of Tennessee, Department of Treas…13,918$2.48M0.01%013F-HRTimeline
YOUSIF CAPITAL MANAGEMENT, LLC13,868$2.47M0.03%-66013F-HRTimeline
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF O…13,446$2.39M0.01%-43313F-HRTimeline
FIFTH THIRD BANK, NATIONAL ASSOCIATIONgroup of 2 filers holding13,264$2.36M+12,687Timeline
Louisiana State Employees Retirement Sy…13,200$2.35M0.04%+60013F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO13,195$2.35M<0.01%+5,48013F-HRTimelineGroup
Skandinaviska Enskilda Banken AB (publ)12,978$2.31M0.05%new13F-HRTimeline
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC12,596$2.24M<0.01%-4,37913F-HRTimelineGroup
ARIZONA STATE RETIREMENT SYSTEM12,541$2.23M0.01%-27713F-HRTimeline
Alpine Global Management, LLC12,500$2.22M0.34%new13F-HRTimeline
OXFORD ASSET MANAGEMENT LLP12,202$2.17M0.88%new13F-HRTimeline
Zurcher Kantonalbank (Zurich Cantonalba…12,140$2.16M<0.01%+2,44213F-HRTimeline
Advisors Asset Management, Inc.12,080$2.15M0.04%-7,77813F-HRTimeline
Mint Tower Capital Management B.V.12,000$2.13M0.2%new13F-HRTimeline
PARADIGM CAPITAL MANAGEMENT INC/NY11,353$2.02M0.08%013F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN11,337$2.02M<0.01%-7,36013F-HR/ATimelineGroup
OCCUDO QUANTITATIVE STRATEGIES LP11,269$2.01M0.11%+1,60613F-HRTimeline
HARVEST MANAGEMENT LLC11,000$1.96M1.04%new13F-HRTimeline
STATE OF MICHIGAN RETIREMENT SYSTEM10,996$1.96M0.01%+20013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS10,993$1.96M<0.01%+3,46413F-HRTimelineGroup
KLP KAPITALFORVALTNING AS10,900$1.94M0.01%+30013F-HRTimeline
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…10,628$1.89M0.02%new13F-HRTimelineGroup
Focus Partners Wealthgroup of 2 filers holding10,543$1.88M+5,069Timeline
LOCKERMAN FINANCIAL GROUP, INC.10,500$1.87M3.36%-1,30013F-HRTimeline
NORTHWESTERN MUTUAL INVESTMENT MANAGEME…group of 2 filers holding10,280$1.83M+11Timeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…10,187$1.81M<0.01%-3,35013F-HRTimelineGroup
MOORE CAPITAL MANAGEMENT, LP10,020$1.78M0.06%new13F-HRTimeline
XPONANCE LLC9,958$1.77M0.01%+1,22013F-HRTimeline
NEW MEXICO EDUCATIONAL RETIREMENT BOARD9,900$1.76M0.05%013F-HRTimeline
OREGON PUBLIC EMPLOYEES RETIREMENT FUND9,374$1.67M0.02%+30013F-HRTimeline
Bellevue Group AGin group Bellevue Group AG8,753$1.56M0.04%-88,53213F-HRTimelineGroup
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…8,411$1.5M0.05%-4,86113F-HRTimelineGroup
LPL Financial LLC8,355$1.49M<0.01%+84313F-HRTimeline
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…7,970$1.42M<0.01%-78,44113F-HRTimelineGroup
ALLSTATE CORPin group ALLSTATE CORP7,898$1.4M0.02%new13F-HRTimelineGroup
Odyssean, LLC7,845$1.4M0.51%new13F-HRTimeline
Jump Financial, LLCin group Jump Financial, LLC7,836$1.39M0.02%-5,11713F-HRTimelineGroup
DE BURLO GROUP INC7,802$1.39M0.31%-15013F-HRTimeline
VICTORY CAPITAL MANAGEMENT INC7,708$1.37M<0.01%-2,12813F-HRTimeline