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Disclosery

MGNI MAGNITE INC

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Stock (common), issuer CIK 1595974

288 managers (297 13F filers) reported a position in MGNI shares at 2026-03-31, 131,564,561 shares in all. 45 filers opened a position and 54 filers sold out during the quarter.

Managers
288
13F filers
297
New
45
Added
114
Reduced
80
Sold out
54
Shares held by filers
131,564,561

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
VANGUARD GROUP INCgroup of 7 filers holding15,143,510$180MnewTimeline
BlackRock, Inc.in group BlackRock, Inc.11,657,496$138M<0.01%+64,24713F-HRTimelineGroup
WELLINGTON MANAGEMENT GROUP LLPin group WELLINGTON MANAGEMENT GROUP L…9,191,077$109M0.02%+561,83913F-HRTimelineGroup
Capital Research Global Investorsin group Capital Research Global Inves…5,020,289$59.6M0.01%-7,900,00013F-HRTimelineGroup
Boston Partnersin group Boston Trust Walden Corp4,719,863$56.1M0.06%+610,97013F-HRTimelineGroup
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC4,626,816$55M0.03%-660,11213F-HRTimelineGroup
FMR LLCin group FMR LLC4,507,419$53.5M<0.01%-2,193,75513F-HRTimelineGroup
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP3,983,674$47.3M0.01%+367,85413F-HRTimelineGroup
Nuveen, LLCin group TIAA3,590,025$42.6M0.01%+58,91713F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC3,553,790$42.2M<0.01%+119,72813F-HRTimelineGroup
Nine Ten Capital Management LLC3,481,283$41.4M13.14%+477,70013F-HRTimeline
STATE STREET CORPin group STATE STREET CORP3,163,139$37.6M<0.01%+21,14813F-HRTimelineGroup
Edenbrook Capital, LLCin group Edenbrook Capital, LLC2,798,036$33.2M17%+10,00013F-HRTimelineGroup
Granahan Investment Management, LLC2,553,413$30.3M1.47%-562,51713F-HRTimeline
Ophir Asset Management Pty Ltd2,118,016$25.2M2.93%-266,17113F-HRTimeline
325 CAPITAL LLCin group 325 CAPITAL LLC2,005,387$23.8M8.68%013F-HRTimelineGroup
KENNEDY CAPITAL MANAGEMENT LLC1,753,542$20.8M0.44%+317,57213F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC1,668,160$19.8M0.02%+1,287,90713F-HRTimelineGroup
No Street GP LP1,628,248$19.3M1.29%+153,24813F-HRTimeline
Schonfeld Strategic Advisors LLC1,605,041$19.1M0.16%+825,36013F-HRTimeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC1,500,852$17.8M<0.01%-260,18513F-HRTimelineGroup
Balyasny Asset Management L.P.in group Balyasny Asset Management1,500,443$17.8M0.04%+627,23513F-HRTimelineGroup
ROYCE & ASSOCIATES LP1,365,489$16.2M0.16%+199,02013F-HRTimeline
Maestria Partners LLC1,363,505$16.2M5.91%013F-HRTimeline
Blue Grotto Capital, LLC1,328,782$15.8M1.82%-300,00013F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP1,322,571$15.7M<0.01%+50,50313F-HRTimelineGroup
VICTORY CAPITAL MANAGEMENT INC1,266,522$15M0.01%+1,115,43813F-HRTimeline
GRIZZLYROCK CAPITAL, LLC1,238,680$14.7M11.65%+666,77413F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC1,234,457$14.7M0.01%+1,210,71313F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co1,180,431$14M<0.01%-7,07013F-HRTimelineGroup
Bank of New York Mellon Corpin group Bank of New York Mellon Corp1,138,217$13.5M<0.01%-45,10113F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/1,125,196$13.4M<0.01%+473,24313F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC1,052,908$12.5M0.01%+508,59013F-HRTimelineGroup
Meros Investment Management, LP992,351$11.8M5.11%+166,75613F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY926,819$11M<0.01%-935,71913F-HRTimelineGroup
Kopion Asset Management, LLCin group Kopion Asset Management, LLC855,904$10.2M7.91%+241,44513F-HRTimelineGroup
UBS Group AGgroup of 2 filers holding773,367$9.19M+41,093Timeline
Man Group plcin group Man Group plc663,957$7.89M0.02%+352,42113F-HRTimelineGroup
Qube Research & Technologies Ltd661,057$7.85M0.01%+458,12113F-HRTimeline
OBERWEIS ASSET MANAGEMENT INC/647,600$7.69M0.23%+11,80013F-HRTimeline
PICTON MAHONEY ASSET MANAGEMENT643,078$7.64M0.08%+254,94713F-HRTimeline
SILVERCREST ASSET MANAGEMENT GROUP LLC616,084$7.32M0.05%-69,17513F-HRTimeline
Park West Asset Management LLC598,380$7.11M0.63%new13F-HRTimeline
NOMURA ASSET MANAGEMENT CO LTDin group NOMURA ASSET MANAGEMENT CO LTD593,900$7.06M0.02%-28,80013F-HRTimelineGroup
CenterBook Partners LP564,156$6.7M0.36%+391,61013F-HRTimeline
KING LUTHER CAPITAL MANAGEMENT CORP531,066$6.31M0.03%+15,43113F-HRTimeline
Pacer Advisors, Inc.501,578$5.96M0.02%new13F-HR/ATimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO486,868$5.63M<0.01%-19,52513F-HR/ATimelineGroup
Capital World Investors456,672$5.43M<0.01%new13F-HRTimeline
QVT Financial LP453,910$5.39M0.43%+392,61713F-HRTimeline
First Eagle Investment Management, LLCin group First Eagle Investment Manage…450,288$5.35M0.01%+153,84513F-HR/ATimelineGroup
PRINCIPAL FINANCIAL GROUP INCin group PRINCIPAL FINANCIAL GROUP INC445,950$5.3M<0.01%+208,73013F-HRTimelineGroup
NORDEA INVESTMENT MANAGEMENT ABin group NORDEA INVESTMENT MANAGEMENT …421,008$4.9M<0.01%-24,00813F-HRTimelineGroup
Caption Management, LLC405,053$4.81M0.23%+388,85313F-HRTimeline
S SQUARED TECHNOLOGY, LLC402,862$4.79M1.81%013F-HR/ATimeline
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP394,856$4.69M<0.01%+31,44413F-HRTimelineGroup
COMMONWEALTH EQUITY SERVICES, LLC359,570$4.27M0.01%+105,25213F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO350,862$4.17M<0.01%+139,32513F-HRTimelineGroup
1492 Capital Management LLC340,542$4.05M1.54%-85613F-HRTimeline
HARBOR CAPITAL ADVISORS, INC.325,261$3.86M0.31%+111,01013F-HRTimeline
Manatuck Hill Partners, LLC310,000$3.68M1.21%-40,00013F-HRTimeline
Lisanti Capital Growth, LLC309,440$3.68M0.93%new13F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…307,805$3.66M<0.01%+19813F-HRTimelineGroup
ALLIANCEBERNSTEIN L.P.223,191$3.62M<0.01%+97,84613F-HRTimeline
Squarepoint Ops LLCin group Squarepoint Ops LLC300,934$3.58M0.01%+255,49613F-HRTimelineGroup
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC291,715$3.47M<0.01%-6,00113F-HRTimelineGroup
Norwood Investment Partners, LP285,000$3.39M5.21%-45,00013F-HRTimeline
Swiss National Bank284,300$3.38M<0.01%+3,60013F-HRTimeline
ALGERT GLOBAL LLC269,035$3.2M0.05%-240,82513F-HR/ATimeline
Invesco Ltd.in group Invesco Ltd.261,370$3.11M<0.01%+17,80513F-HRTimelineGroup
Senvest Management, LLC224,100$2.66M0.09%013F-HRTimeline
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC210,567$2.5M<0.01%-9,87313F-HRTimelineGroup
Hilton Capital Management, LLC208,154$2.47M0.19%+27,68113F-HRTimeline
RICE HALL JAMES & ASSOCIATES, LLC192,808$2.29M0.13%-6,02013F-HRTimeline
WEDGE CAPITAL MANAGEMENT L L P/NC189,767$2.25M0.04%-13613F-HRTimeline
Walleye Capital LLCgroup of 2 filers holding187,027$2.22M+108,603Timeline
STATE OF WISCONSIN INVESTMENT BOARD185,470$2.2M0.01%-34,08913F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC180,646$2.15M<0.01%-185,74413F-HRTimelineGroup
RHUMBLINE ADVISERS179,976$2.14M<0.01%-3,96913F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…176,528$2.1M<0.01%+40,00413F-HRTimeline
P.A.W. CAPITAL CORP170,000$2.02M1.62%+30,00013F-HR/ATimeline
PRICE T ROWE ASSOCIATES INC /MD/165,440$1.97M<0.01%-546,05513F-HRTimeline
LPL Financial LLC155,444$1.85M<0.01%+38,99413F-HRTimeline
DBA TRADING, LLC150,000$1.78M0.89%+95,00013F-HRTimeline
ExodusPoint Capital Management, LP149,219$1.77M0.02%new13F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd146,591$1.74M0.03%+99,92813F-HRTimelineGroup
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\139,644$1.66M<0.01%+11,17613F-HRTimelineGroup
Tidal Investments LLCin group Tidal Investments LLC133,764$1.59M<0.01%+9,85613F-HRTimelineGroup
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…133,245$1.58M0.02%new13F-HRTimelineGroup
TWINBEECH CAPITAL LP132,379$1.57M0.16%new13F-HRTimeline
Quantinno Capital Management LP128,133$1.52M<0.01%+75,68613F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc122,047$1.45M<0.01%-26,79413F-HRTimelineGroup
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC121,212$1.44M<0.01%+23,67713F-HRTimelineGroup
PERKINS CAPITAL MANAGEMENT INC119,275$1.42M1.33%-2,50013F-HRTimeline
Radcliffe Capital Management, L.P.112,400$1.34M0.1%+25,00013F-HRTimeline
Penbrook Management LLC112,190$1.33M1.01%+81,07513F-HRTimeline
FRANKLIN RESOURCES INCin group Franklin Resources109,583$1.3M<0.01%+61313F-HRTimelineGroup
GAMCO Investors (Gabelli)group of 2 filers holding106,473$1.26M+31,174Timeline
Dana Investment Advisors, Inc.102,413$1.22M0.04%-152,52213F-HRTimeline
Holocene Advisors, LP101,973$1.21M<0.01%+86,41113F-HRTimeline
Cerity Partners LLCin group Cerity Partners LLC101,213$1.2M<0.01%+42513F-HRTimelineGroup
Cardinal Point Capital Management ULC94,950$1.13M0.07%+26,42513F-HRTimeline
FOX RUN MANAGEMENT, L.L.C.88,103$1.02M0.18%new13F-HRTimeline
Stephens Investment Management Group LLCgroup of 2 filers holding85,537$1.02M-1,130,453Timeline
Legato Capital Management LLC84,790$1.01M0.09%new13F-HRTimeline
Z3 Capital Partners, LLC81,350$966K0.24%-10,80013F-HRTimeline
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC78,262$930K<0.01%-85,69213F-HRTimelineGroup
ARDSLEY ADVISORY PARTNERS LP78,000$927K0.14%new13F-HRTimeline
MetLife Investment Management, LLCin group MetLife Investment Management…77,665$923K<0.01%-36013F-HRTimelineGroup
TEACHERS RETIREMENT SYSTEM OF THE STATE…76,813$913K0.01%013F-HRTimeline
TUDOR INVESTMENT CORP ET AL73,645$875K<0.01%+38,97113F-HRTimeline
Creative Planningin group Creative Planning72,178$857K<0.01%+41,44313F-HRTimelineGroup
NANO CAP NEW MILLENNIUM GROWTH FUND L P70,000$832K0.78%+20,00013F-HRTimeline
JUPITER ASSET MANAGEMENT LTDin group JUPITER ASSET MANAGEMENT LTD69,441$825K<0.01%new13F-HRTimelineGroup
STEINBERGANNA WEALTH MANAGEMENT69,024$820K0.39%013F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…66,734$793K<0.01%+1,73113F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN66,102$785K<0.01%-127,51713F-HR/ATimelineGroup
PINNACLE ASSOCIATES LTD65,756$781K0.01%+14,03813F-HRTimeline
Zurcher Kantonalbank (Zurich Cantonalba…64,707$769K<0.01%+11,33913F-HRTimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …64,558$767K<0.01%-1,02813F-HRTimelineGroup
Vident Advisory, LLCin group Vident Advisory, LLC63,366$753K0.01%+46,64313F-HRTimelineGroup
FIFTH THIRD BANCORPin group FIFTH THIRD BANK, NATIONAL AS…58,823$699K<0.01%new13F-HRTimelineGroup
JANUS HENDERSON GROUP PLCin group Janus Henderson58,423$694K<0.01%013F-HR/ATimelineGroup
Advisory Services Network, LLC58,260$692K0.01%+1,73313F-HRTimeline
JENNISON ASSOCIATES LLC57,849$687K<0.01%new13F-HRTimeline
SG Americas Securities, LLC57,237$680K<0.01%-2,00813F-HRTimeline
MOODY NATIONAL BANK TRUST DIVISIONin group MOODY NATIONAL BANK TRUST DIV…53,315$633K0.06%-42,86913F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA52,917$628K<0.01%-9,39613F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…49,098$583K<0.01%-401,92313F-HRTimelineGroup
STIFEL FINANCIAL CORPin group STIFEL FINANCIAL CORP46,601$554K<0.01%-12,18113F-HRTimelineGroup
CANADA PENSION PLAN INVESTMENT BOARD46,052$547K<0.01%+27,60013F-HRTimeline
Homestead Advisers Corp43,900$522K0.01%013F-HRTimeline
MARSHALL WACE, LLPin group MARSHALL WACE, LLP42,468$505K<0.01%+13,70513F-HRTimelineGroup
NATIXISin group Natixis Investment Managers42,100$500K<0.01%new13F-HRTimelineGroup
Allspring Global Investments Holdings, …in group Allspring Global Investments …41,766$492K<0.01%+4,30413F-HRTimelineGroup
Police & Firemen's Retirement System of…40,290$479K<0.01%+3,18513F-HRTimeline
ARIZONA STATE RETIREMENT SYSTEM39,456$469K<0.01%-16113F-HRTimeline
HSBC HOLDINGS PLCin group HSBC HOLDINGS PLC38,399$460K<0.01%-14,38513F-HRTimelineGroup
STATE BOARD OF ADMINISTRATION OF FLORID…38,231$454K<0.01%013F-HRTimeline
INTECH INVESTMENT MANAGEMENT LLC37,399$444K<0.01%-28,83613F-HRTimeline
GREENWOOD CAPITAL ASSOCIATES LLC36,804$437K0.05%-1,81613F-HRTimeline
NEW YORK STATE COMMON RETIREMENT FUND36,725$436K<0.01%-437,73213F-HRTimeline
LOS ANGELES CAPITAL MANAGEMENT LLC35,325$420K<0.01%-4,75913F-HRTimeline
Diametric Capital, LP34,783$413K0.11%-14,92113F-HRTimeline
Jackson Creek Investment Advisors LLC34,671$412K0.12%new13F-HRTimeline
Handelsbanken Fonder AB34,300$407K<0.01%013F-HRTimeline
KLP KAPITALFORVALTNING AS32,400$385K<0.01%+1,90013F-HRTimeline
BROWN ADVISORY INCin group BROWN ADVISORY INC31,524$375K<0.01%+10,26113F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS31,464$374K<0.01%-16813F-HRTimelineGroup
Buckland Partners Management Co LLC31,446$374K0.23%013F-HRTimeline
Fulton Bank, N.A.30,740$365K0.01%-65513F-HRTimeline
State of Alaska, Department of Revenue30,334$360K<0.01%013F-HRTimeline
Blue Trust, Inc.29,073$345K<0.01%+1,59913F-HRTimeline
Northwest & Ethical Investments L.P.28,181$343K0.01%+10,54213F-HRTimeline
IMC-Chicago, LLC27,774$330K<0.01%-105,32213F-HRTimeline
Linden Thomas Advisory Services, LLC26,421$314K0.03%new13F-HRTimeline
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…25,755$306K<0.01%+3,11413F-HRTimelineGroup
GROUP ONE TRADING LLC24,999$297K0.01%+19,65213F-HRTimeline
Entropy Technologies, LP24,761$294K0.01%new13F-HRTimeline
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …23,695$281K<0.01%-106,09213F-HRTimelineGroup
ELEVATION POINT WEALTH PARTNERS, LLC23,648$281K0.01%new13F-HRTimeline
Amundiin group Amundi22,817$271K<0.01%+9,76413F-HRTimelineGroup
Pinnacle Wealth Management Advisory Gro…22,577$268K0.02%-1,86613F-HRTimeline
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC22,452$267K<0.01%new13F-HRTimelineGroup
Dynamic Technology Lab Private Ltd22,162$263K0.04%new13F-HRTimeline
MIRABELLA FINANCIAL SERVICES LLP21,285$253K0.02%new13F-HRTimeline
Verdence Capital Advisors LLC20,891$248K0.01%+3,89813F-HRTimeline
ProShare Advisors LLC20,628$245K<0.01%-4,95513F-HRTimeline
Virtu Financial LLCin group Virtu Financial LLC20,044$238K0.01%new13F-HRTimelineGroup
CAPTRUST FINANCIAL ADVISORS18,658$222K<0.01%+3,32913F-HRTimeline
STRS OHIO18,500$220K<0.01%-16,70013F-HRTimeline
MERCER GLOBAL ADVISORS INC /ADV18,458$219K<0.01%new13F-HRTimeline
PRELUDE CAPITAL MANAGEMENT, LLC17,889$213K0.02%-134,31113F-HRTimeline
AVENIR CORP17,715$210K0.03%new13F-HRTimeline
Centiva Capital, LP17,000$202K0.01%013F-HRTimeline
CITIGROUP INCin group CITIGROUP INC15,860$188K<0.01%-35,56413F-HRTimelineGroup
CANADA LIFE ASSURANCE Coin group CANADA LIFE ASSURANCE Co15,140$181K<0.01%013F-HRTimelineGroup
Cambridge Investment Research Advisors,…15,022$178K<0.01%+96613F-HRTimeline
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION…14,986$178K<0.01%013F-HRTimeline
Winthrop Advisory Group LLC14,520$172K0.01%013F-HRTimeline
Caitong International Asset Management …14,350$170K0.03%new13F-HRTimeline
GWN SECURITIES INC.14,321$170K0.03%new13F-HRTimeline
WOODMONT INVESTMENT COUNSEL LLC14,250$169K0.01%013F-HRTimeline
Ensign Peak Advisors, Inc13,658$162K<0.01%013F-HR/ATimeline
XPONANCE LLC13,486$160K<0.01%+2,39013F-HRTimeline
GSA CAPITAL PARTNERS LLP13,347$159K0.01%-3,17613F-HRTimeline
Bayforest Capital Ltd13,225$157K0.18%+6,81013F-HRTimeline
Cetera Investment Advisers13,157$156K<0.01%-21,14013F-HRTimeline
Parallax Volatility Advisers, L.P.13,133$156K0.01%-41,52513F-HRTimeline
HCR Wealth Advisors13,000$154K0.02%013F-HRTimeline
Gotham Asset Management, LLC12,885$153K<0.01%new13F-HRTimeline
OP Asset Management Ltd12,621$150K<0.01%013F-HR/ATimeline
Ledgewood Wealth Advisors, LLC12,577$149K0.08%-1,52013F-HRTimeline
TRUIST FINANCIAL CORPin group TRUIST FINANCIAL CORP12,076$143K<0.01%-9,20813F-HRTimelineGroup
TWO SIGMA SECURITIES, LLC12,031$143K0.02%new13F-HRTimeline
Sciencast Management LP11,704$139K0.02%new13F-HRTimeline
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…11,700$139K<0.01%013F-HRTimelineGroup
DARK FOREST CAPITAL MANAGEMENT LP11,687$139K0.01%new13F-HRTimeline
MONEY CONCEPTS CAPITAL CORP11,659$139K0.01%new13F-HRTimeline
M&T Bank Corpin group M&T Bank Corp11,621$138K<0.01%-5,62013F-HR/ATimelineGroup