Skip to content
Disclosery

MGNI MAGNITE INC

Follow

Stock (common), issuer CIK 1595974

300 managers (304 13F filers) reported a position in MGNI shares at 2025-12-31, 136,686,964 shares in all. 46 filers opened a position and 55 filers sold out during the quarter.

Managers
300
13F filers
304
New
46
Added
122
Reduced
93
Sold out
55
Shares held by filers
136,686,964

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, Q4 2025

Filers in the available 13F reports with a share position at 2025-12-31, 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 INCin group VANGUARD GROUP INC14,802,630$240M<0.01%+148,19813F-HRTimelineGroup
Capital Research Global Investorsin group Capital Research Global Inves…12,920,289$210M0.04%+5,937,42813F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.11,593,249$188M<0.01%+180,09413F-HRTimelineGroup
WELLINGTON MANAGEMENT GROUP LLPin group WELLINGTON MANAGEMENT GROUP L…8,629,238$140M0.02%+3,484,68913F-HRTimelineGroup
FMR LLCin group FMR LLC6,701,174$109M0.01%-10,439,84013F-HRTimelineGroup
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC5,286,928$85.8M0.04%+692,85813F-HRTimelineGroup
Boston Partnersin group Boston Trust Walden Corp4,108,893$66.6M0.07%-340,11113F-HRTimelineGroup
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP3,615,820$58.7M0.01%+48,56613F-HRTimelineGroup
Nuveen, LLCin group TIAA3,531,108$57.3M0.02%+439,07213F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC3,434,062$55.7M<0.01%+34,96913F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP3,141,991$51M<0.01%+15,20113F-HRTimelineGroup
Granahan Investment Management, LLC3,115,930$50.6M2.17%-757,24913F-HRTimeline
Nine Ten Capital Management LLC3,003,583$48.7M15.43%+145,00013F-HRTimeline
Edenbrook Capital, LLCin group Edenbrook Capital, LLC2,788,036$45.2M19.1%+677,66613F-HRTimelineGroup
Ophir Asset Management Pty Ltd2,384,187$38.7M4.34%new13F-HRTimeline
325 CAPITAL LLCin group 325 CAPITAL LLC2,005,387$32.5M11.4%+1,355,32613F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY1,862,538$30.2M<0.01%-183,69913F-HR/ATimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC1,761,037$28.6M<0.01%-624,40213F-HR/ATimelineGroup
Blue Grotto Capital, LLC1,628,782$26.4M2.72%+79,98613F-HRTimeline
No Street GP LP1,475,000$23.9M1.61%new13F-HRTimeline
KENNEDY CAPITAL MANAGEMENT LLC1,435,970$23.3M0.49%+222,35713F-HRTimeline
Maestria Partners LLC1,363,505$22.1M6.48%+222,33413F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP1,272,068$20.6M<0.01%-92,98813F-HRTimelineGroup
Stephens Investment Management Group LLCgroup of 2 filers holding1,215,990$19.7M+167,979Timeline
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co1,187,501$19.3M<0.01%-30,34713F-HRTimelineGroup
Bank of New York Mellon Corpin group Bank of New York Mellon Corp1,183,318$19.2M<0.01%-78,57513F-HRTimelineGroup
ROYCE & ASSOCIATES LP1,166,469$18.9M0.19%+190,31813F-HRTimeline
FRONTIER CAPITAL MANAGEMENT CO LLC944,701$15.3M0.16%-148,53213F-HRTimeline
Balyasny Asset Management L.P.in group Balyasny Asset Management873,208$14.2M0.03%new13F-HRTimelineGroup
Meros Investment Management, LP825,595$13.4M5.31%+211,76713F-HRTimeline
J. Goldman & Co LP782,837$12.7M0.49%-245,86113F-HRTimeline
Schonfeld Strategic Advisors LLC779,681$12.7M0.06%new13F-HRTimeline
UBS Group AGgroup of 2 filers holding732,274$11.9M-14,190Timeline
PRICE T ROWE ASSOCIATES INC /MD/711,495$11.5M<0.01%-1,836,01013F-HRTimeline
Penn Capital Management Company, LLC694,766$11.3M0.9%-19,16713F-HRTimeline
SILVERCREST ASSET MANAGEMENT GROUP LLC685,259$11.1M0.08%+160,36213F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/651,953$10.6M<0.01%-144,29113F-HRTimelineGroup
OBERWEIS ASSET MANAGEMENT INC/635,800$10.3M0.38%+121,80013F-HRTimeline
NOMURA ASSET MANAGEMENT CO LTDin group NOMURA ASSET MANAGEMENT CO LTD622,700$10.1M0.03%-717,06513F-HRTimelineGroup
Kopion Asset Management, LLCin group Kopion Asset Management, LLC614,459$9.97M7.13%+367,85813F-HRTimelineGroup
Apis Capital Advisors, LLC604,000$9.8M1.71%-235,39913F-HRTimeline
Pillsbury Lake Capital LLC583,644$9.47M3.86%13F-HRTimeline
GRIZZLYROCK CAPITAL, LLC571,906$9.28M6.95%+181,00013F-HRTimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC544,318$8.83M0.01%+374,75713F-HRTimelineGroup
KING LUTHER CAPITAL MANAGEMENT CORP515,635$8.37M0.03%+65,67513F-HRTimeline
ALGERT GLOBAL LLC509,860$8.28M0.13%+462,59013F-HR/ATimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO506,393$8.22M<0.01%-703,02013F-HRTimelineGroup
NEW YORK STATE COMMON RETIREMENT FUND474,457$7.7M0.01%013F-HRTimeline
NORDEA INVESTMENT MANAGEMENT ABin group NORDEA INVESTMENT MANAGEMENT …445,016$7.34M0.01%-2,32413F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…451,021$7.32M0.01%+141,41713F-HRTimelineGroup
S SQUARED TECHNOLOGY, LLC402,862$6.54M2.53%+135,00013F-HRTimeline
PICTON MAHONEY ASSET MANAGEMENT388,131$6.3M0.07%+79913F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC380,253$6.17M0.01%-710,37013F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC366,390$5.95M<0.01%+155,73513F-HRTimelineGroup
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP363,412$5.9M0.01%+62,98113F-HRTimelineGroup
Manatuck Hill Partners, LLC350,000$5.68M1.99%+70913F-HRTimeline
1492 Capital Management LLC341,398$5.54M2.12%+4,73213F-HRTimeline
Norwood Investment Partners, LP330,000$5.36M6.03%-100,00013F-HRTimeline
Man Group plcin group Man Group plc311,536$5.06M0.01%new13F-HRTimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…307,607$4.99M0.01%-305,37813F-HRTimelineGroup
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC297,716$4.83M<0.01%-12,93713F-HRTimelineGroup
First Eagle Investment Management, LLCin group First Eagle Investment Manage…296,443$4.81M0.01%-279,00013F-HRTimelineGroup
Swiss National Bank280,700$4.56M<0.01%+8,10013F-HRTimeline
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/276,273$4.48M<0.01%+34,94113F-HRTimelineGroup
SIMPLEX TRADING, LLC263,362$4.27M0.12%+146,31713F-HRTimeline
Dana Investment Advisors, Inc.254,935$4.14M0.12%-154,18613F-HRTimeline
COMMONWEALTH EQUITY SERVICES, LLC254,318$4.13M0.01%+42,00013F-HRTimeline
Invesco Ltd.in group Invesco Ltd.243,565$3.95M<0.01%-15,16713F-HRTimelineGroup
PRINCIPAL FINANCIAL GROUP INCin group PRINCIPAL FINANCIAL GROUP INC237,220$3.85M<0.01%+74,78013F-HRTimelineGroup
Senvest Management, LLC224,100$3.64M0.11%new13F-HRTimeline
VOYA INVESTMENT MANAGEMENT LLCin group VOYA INVESTMENT MANAGEMENT LLC220,440$3.58M<0.01%+32,34813F-HRTimelineGroup
STATE OF WISCONSIN INVESTMENT BOARD219,559$3.56M0.01%+12,65413F-HRTimeline
HARBOR CAPITAL ADVISORS, INC.214,251$3.48M0.27%+42,08013F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO211,537$3.43M<0.01%+136,55413F-HRTimelineGroup
Qube Research & Technologies Ltd202,936$3.29M<0.01%-6,00213F-HRTimeline
AYAL Capital Advisors Ltd200,000$3.25M1.78%+1,00013F-HRTimeline
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP199,872$3.24M<0.01%-105,01513F-HRTimelineGroup
RICE HALL JAMES & ASSOCIATES, LLC198,828$3.23M0.18%+65,61013F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN193,619$3.14M<0.01%+55,89813F-HRTimelineGroup
WEDGE CAPITAL MANAGEMENT L L P/NC189,903$3.08M0.06%+59,12413F-HRTimeline
RHUMBLINE ADVISERS183,945$2.99M<0.01%-33,36213F-HRTimeline
Hilton Capital Management, LLC180,473$2.93M0.22%+39,41513F-HRTimeline
FEDERATED HERMES, INC.in group FEDERATED HERMES, INC.172,947$2.81M<0.01%+149,84713F-HRTimelineGroup
CenterBook Partners LP172,546$2.8M0.14%+99,76013F-HRTimeline
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC163,954$2.66M<0.01%-6,19813F-HRTimelineGroup
PRELUDE CAPITAL MANAGEMENT, LLC152,200$2.47M0.18%+38,55113F-HRTimeline
VICTORY CAPITAL MANAGEMENT INC151,084$2.45M<0.01%+104,78313F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc148,841$2.42M<0.01%-11,59613F-HRTimelineGroup
Bridgewater Associates, LP145,187$2.36M0.01%-48413F-HRTimeline
P.A.W. CAPITAL CORP140,000$2.27M5.16%+40,00013F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…136,524$2.22M<0.01%+3,94313F-HRTimeline
IMC-Chicago, LLC133,096$2.16M0.04%new13F-HRTimeline
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …129,787$2.11M<0.01%-283,36313F-HRTimelineGroup
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\128,468$2.09M<0.01%-1,18313F-HRTimelineGroup
ALLIANCEBERNSTEIN L.P.125,345$2.03M<0.01%-19,30013F-HRTimeline
Tidal Investments LLCin group Tidal Investments LLC123,908$2.01M0.01%+24,82213F-HRTimelineGroup
PERKINS CAPITAL MANAGEMENT INC121,775$1.98M1.57%-9,50013F-HRTimeline
BOOTHBAY FUND MANAGEMENT, LLC117,842$1.91M0.05%+58,96513F-HRTimeline
LPL Financial LLC116,450$1.89M<0.01%+6,58313F-HRTimeline
Calamos Advisors LLCin group Calamos Advisors LLC113,457$1.84M0.01%+61,67213F-HRTimelineGroup
FRANKLIN RESOURCES INCin group Franklin Resources108,970$1.77M<0.01%-8,51413F-HRTimelineGroup
Cerity Partners LLCin group Cerity Partners LLC100,788$1.64M<0.01%+23513F-HRTimelineGroup
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC97,535$1.58M<0.01%+49,46413F-HRTimelineGroup
MOODY NATIONAL BANK TRUST DIVISIONin group MOODY NATIONAL BANK TRUST DIV…96,184$1.56M0.15%-101,60813F-HRTimelineGroup
Magnetar Financial LLCin group Magnetar Financial LLC96,163$1.56M0.02%+80,97413F-HRTimelineGroup
COMERICA BANK94,556$1.53M0.01%-3,60113F-HRTimeline
Z3 Capital Partners, LLC92,150$1.5M0.36%13F-HRTimeline
Radcliffe Capital Management, L.P.87,400$1.42M0.08%+47,40013F-HRTimeline
Walleye Capital LLCgroup of 2 filers holding78,424$1.27M+61,144Timeline
MetLife Investment Management, LLCin group MetLife Investment Management…78,025$1.27M0.01%-3,47513F-HRTimelineGroup
TEACHERS RETIREMENT SYSTEM OF THE STATE…76,813$1.25M0.01%+51,61213F-HRTimeline
GAMCO Investors (Gabelli)group of 2 filers holding75,299$1.22M+8,010Timeline
STEINBERGANNA WEALTH MANAGEMENT69,024$1.12M0.52%013F-HRTimeline
Cardinal Point Capital Management ULC68,525$1.11M0.07%+31,42513F-HRTimeline
INTECH INVESTMENT MANAGEMENT LLC66,235$1.07M0.01%+7,03113F-HRTimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …65,586$1.06M<0.01%-1,54013F-HRTimelineGroup
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…65,003$1.05M<0.01%-6013F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA62,313$1.01M<0.01%+18,62313F-HRTimelineGroup
Verition Fund Management LLC62,277$1.01M0.01%-26,01913F-HRTimeline
QVT Financial LP61,293$995K0.09%new13F-HRTimeline
SG Americas Securities, LLC59,245$962K<0.01%+17,65213F-HRTimeline
STIFEL FINANCIAL CORPin group STIFEL FINANCIAL CORP58,782$954K<0.01%-34913F-HRTimelineGroup
Weiss Asset Management LPin group Weiss Asset Management LP58,484$949K0.01%new13F-HRTimelineGroupThe filing omitted confidential holdings, a later amendment may add them.
JANUS HENDERSON GROUP PLCin group Janus Henderson58,423$948K<0.01%013F-HRTimelineGroup
Advisory Services Network, LLC56,527$917K0.01%-7,08613F-HRTimeline
DBA TRADING, LLC55,000$893K0.89%13F-HRTimeline
Parallax Volatility Advisers, L.P.54,658$887K0.03%-76,02513F-HRTimeline
Zurcher Kantonalbank (Zurich Cantonalba…53,368$866K<0.01%+4,49713F-HRTimeline
HSBC HOLDINGS PLCin group HSBC HOLDINGS PLC52,784$857K<0.01%+10,45513F-HR/ATimelineGroup
Quantinno Capital Management LP52,447$851K<0.01%+28,87113F-HRTimeline
PINNACLE ASSOCIATES LTD51,718$839K0.01%+5,89313F-HRTimeline
CITIGROUP INCin group CITIGROUP INC51,424$835K<0.01%-111,91913F-HRTimelineGroup
Laurion Capital Management LP50,869$826K0.06%new13F-HR/ATimeline
NANO CAP NEW MILLENNIUM GROWTH FUND L P50,000$812K0.69%13F-HRTimeline
Diametric Capital, LP49,704$807K0.22%+28,08213F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd46,663$757K0.02%-34,78213F-HRTimelineGroup
Squarepoint Ops LLCin group Squarepoint Ops LLC45,438$737K<0.01%-121,03113F-HRTimelineGroup
Homestead Advisers Corp43,900$712K0.02%013F-HRTimeline
LOS ANGELES CAPITAL MANAGEMENT LLC40,084$694K<0.01%new13F-HRTimeline
Engineers Gate Manager LP41,137$668K0.01%new13F-HRTimeline
ARIZONA STATE RETIREMENT SYSTEM39,617$643K<0.01%-2,12313F-HRTimeline
GREENWOOD CAPITAL ASSOCIATES LLC38,620$627K0.07%+12,27713F-HRTimeline
STATE BOARD OF ADMINISTRATION OF FLORID…38,231$620K<0.01%013F-HRTimeline
Police & Firemen's Retirement System of…37,105$602K0.01%-2,19313F-HRTimeline
Allspring Global Investments Holdings, …in group Allspring Global Investments …37,462$602K<0.01%+3,27613F-HRTimelineGroup
STRS OHIO35,200$571K<0.01%-8,70013F-HRTimeline
TUDOR INVESTMENT CORP ET AL34,674$563K<0.01%-414,43513F-HRTimeline
Handelsbanken Fonder AB34,300$557K<0.01%+4,20013F-HRTimeline
Cetera Investment Advisers34,297$557K<0.01%+62713F-HRTimeline
Thrivent Financial for Lutheransin group Thrivent Financial for Luther…32,744$531K<0.01%-6,90213F-HRTimelineGroup
Nippon Life Global Investors Americas, …32,180$522K0.02%-88,17013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS31,632$513K<0.01%-4,60913F-HRTimelineGroup
Buckland Partners Management Co LLC31,446$510K0.28%13F-HRTimeline
Fulton Bank, N.A.31,395$510K0.02%-24213F-HRTimeline
Penbrook Management LLC31,115$505K0.35%+2,69513F-HRTimeline
Creative Planningin group Creative Planning30,735$499K<0.01%+8,84213F-HRTimelineGroup
KLP KAPITALFORVALTNING AS30,500$495K<0.01%+1,40013F-HRTimeline
State of Alaska, Department of Revenue30,334$492K0.01%new13F-HRTimeline
Sender Co & Partners, Inc.29,905$485K0.28%new13F-HRTimeline
Orion Porfolio Solutions, LLC29,372$477K<0.01%new13F-HRTimeline
MARSHALL WACE, LLPin group MARSHALL WACE, LLP28,763$467K<0.01%+16,11513F-HRTimelineGroup
Edgestream Partners, L.P.28,194$458K0.01%new13F-HRTimeline
Freestone Grove Partners LP27,761$451K<0.01%new13F-HRTimeline
Blue Trust, Inc.27,474$446K0.01%new13F-HRTimeline
ProShare Advisors LLC25,583$415K<0.01%+1,63713F-HRTimeline
ANTIPODES PARTNERS Ltd24,831$403K0.01%new13F-HRTimeline
Outlook Wealth Advisors, LLC24,764$402K0.09%+4,49813F-HRTimeline
Pinnacle Wealth Management Advisory Gro…24,443$397K0.03%new13F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC23,744$385K<0.01%-652,60513F-HRTimelineGroup
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…22,641$367K<0.01%013F-HRTimelineGroup
TRUIST FINANCIAL CORPin group TRUIST FINANCIAL CORP21,284$345K<0.01%-1,83813F-HRTimelineGroup
BROWN ADVISORY INCin group BROWN ADVISORY INC21,263$345K<0.01%-43,41813F-HRTimelineGroup
GRIFFIN ASSET MANAGEMENT, INC.19,935$324K0.04%013F-HRTimeline
AlphaQuest LLC19,153$311K0.02%+5,66213F-HRTimeline
CANADA PENSION PLAN INVESTMENT BOARD18,452$299K<0.01%+15,65213F-HRTimeline
Northwest & Ethical Investments L.P.17,639$290K0.01%-1,92113F-HR/ATimeline
M&T Bank Corpin group M&T Bank Corp17,241$279K<0.01%+4,49113F-HR/ATimelineGroup
Centiva Capital, LP17,000$276K0.02%new13F-HRTimeline
Verdence Capital Advisors LLC16,993$276K0.02%-10,65413F-HRTimeline
Vident Advisory, LLCin group Vident Advisory, LLC16,723$271K<0.01%+10213F-HRTimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.16,529$268K<0.01%-30,67813F-HRTimelineGroup
GSA CAPITAL PARTNERS LLP16,523$268K0.02%new13F-HRTimeline
Caption Management, LLC16,200$263K0.01%new13F-HRTimeline
Holocene Advisors, LP15,562$253K<0.01%new13F-HRTimeline
CAPTRUST FINANCIAL ADVISORS15,329$249K<0.01%+2,08113F-HRTimeline
CANADA LIFE ASSURANCE Coin group CANADA LIFE ASSURANCE Co15,140$246K<0.01%-29,41213F-HRTimelineGroup
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION…14,986$243K<0.01%013F-HRTimeline
Winthrop Advisory Group LLC14,520$236K0.02%+44013F-HR/ATimeline
WOODMONT INVESTMENT COUNSEL LLC14,250$231K0.01%013F-HRTimeline
Ledgewood Wealth Advisors, LLC14,097$229K0.13%013F-HRTimeline
Cambridge Investment Research Advisors,…14,056$228K<0.01%+1,49913F-HRTimeline
ARS Investment Partners, LLC14,000$227K0.01%+2,00013F-HRTimeline
Ensign Peak Advisors, Inc13,658$222K<0.01%-20,25013F-HR/ATimeline
Amundiin group Amundi13,053$212K<0.01%new13F-HRTimelineGroup
HCR Wealth Advisors13,000$211K0.02%013F-HRTimeline
FLORIDA FINANCIAL ADVISORS, LLC12,686$206K0.06%new13F-HRTimeline
OP Asset Management Ltd12,621$205K<0.01%+4,39113F-HR/ATimeline
Bayesian Capital Management, LP11,987$195K0.45%new13F-HRTimeline
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…11,700$190K0.01%013F-HRTimelineGroup
Concurrent Investment Advisors, LLCin group Concurrent Investment Advisor…11,270$183K<0.01%new13F-HRTimelineGroup