Skip to content
Disclosery

MGNI MAGNITE INC

Follow

Stock (common), issuer CIK 1595974

312 managers (316 13F filers) reported a position in MGNI shares at 2025-09-30, 137,983,989 shares in all. 68 filers opened a position and 41 filers sold out during the quarter.

Managers
312
13F filers
316
New
68
Added
83
Reduced
124
Sold out
41
Shares held by filers
137,983,989

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
FMR LLCin group FMR LLC17,141,014$373M0.02%-44,92513F-HRTimelineGroup
VANGUARD GROUP INCin group VANGUARD GROUP INC14,654,432$319M<0.01%+1,092,14713F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.11,413,155$249M<0.01%+715,11113F-HRTimelineGroup
Capital Research Global Investorsin group Capital Research Global Inves…6,982,861$152M0.03%-5,937,20913F-HRTimelineGroup
WELLINGTON MANAGEMENT GROUP LLPin group WELLINGTON MANAGEMENT GROUP L…5,144,549$112M0.02%-303,28813F-HRTimelineGroup
AMERICAN CENTURY COMPANIES INCin group AMERICAN CENTURY COMPANIES INC4,594,070$100M0.05%-235,12713F-HRTimelineGroup
Boston Partnersin group Boston Trust Walden Corp4,449,004$95.2M0.1%-1,125,60013F-HRTimelineGroup
Granahan Investment Management, LLC3,873,179$84.4M3.45%+230,39313F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP3,567,254$77.7M0.02%-1,334,57913F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC3,399,093$74M<0.01%+182,25113F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP3,126,790$68.1M<0.01%+73,18313F-HRTimelineGroup
Nuveen, LLCin group TIAA3,092,036$67.3M0.02%-159,05613F-HRTimelineGroup
Nine Ten Capital Management LLC2,858,583$62.3M16.05%013F-HRTimeline
PRICE T ROWE ASSOCIATES INC /MD/2,547,505$55.5M0.01%+2,429,90413F-HRTimeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC2,385,439$52M0.01%+470,03913F-HRTimelineGroup
Edenbrook Capital, LLCin group Edenbrook Capital, LLC2,110,370$46M23.36%-1,499,60213F-HRTimelineGroup
MORGAN STANLEYin group MORGAN STANLEY2,046,237$44.6M<0.01%+875,68213F-HR/ATimelineGroup
Blue Grotto Capital, LLC1,548,796$33.7M3.91%+1,263,99213F-HRTimeline
Driehaus Capital Management LLC1,516,296$33M0.24%-1,265,88213F-HRTimeline
NORTHERN TRUST CORPin group NORTHERN TRUST CORP1,365,056$29.7M<0.01%+25,18513F-HRTimelineGroup
NOMURA ASSET MANAGEMENT CO LTDin group NOMURA ASSET MANAGEMENT CO LTD1,339,765$29.2M0.08%-400,97613F-HRTimelineGroup
Bank of New York Mellon Corpin group Bank of New York Mellon Corp1,261,893$27.5M<0.01%-536,34713F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co1,217,848$26.5M<0.01%+78,30713F-HRTimelineGroup
KENNEDY CAPITAL MANAGEMENT LLC1,213,613$26.4M0.58%+344,46613F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO1,209,413$26.3M<0.01%+271,32513F-HR/ATimelineGroup
Maestria Partners LLC1,141,171$24.9M7.86%-293,14613F-HRTimeline
FRONTIER CAPITAL MANAGEMENT CO LLC1,093,233$23.8M0.21%-700,59713F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC1,090,623$23.8M0.03%+806,33313F-HRTimelineGroup
Stephens Investment Management Group LLCgroup of 2 filers holding1,048,011$22.8M-385,036Timeline
J. Goldman & Co LP1,028,698$22.4M0.85%+425,01513F-HRTimeline
ROYCE & ASSOCIATES LP976,151$21.3M0.21%-101,75513F-HRTimeline
T. Rowe Price Investment Management, In…890,918$19.4M0.01%new13F-HRTimeline
Apis Capital Advisors, LLC839,399$18.3M4.04%-208,60113F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/796,244$17.3M<0.01%+382,81913F-HR/ATimelineGroup
UBS Group AGgroup of 2 filers holding746,464$16.3M-1,530,031Timeline
Penn Capital Management Company, LLC713,933$15.6M1.2%-33,90113F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC676,349$14.7M0.01%new13F-HRTimelineGroup
325 CAPITAL LLCin group 325 CAPITAL LLC650,061$14.2M4.3%new13F-HRTimelineGroup
Meros Investment Management, LP613,828$13.4M5.71%-88,31413F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…612,985$13.4M0.02%+248,45313F-HRTimelineGroup
First Eagle Investment Management, LLCin group First Eagle Investment Manage…575,443$12.5M0.02%-42,67613F-HRTimelineGroup
SILVERCREST ASSET MANAGEMENT GROUP LLC524,897$11.4M0.08%-279,35013F-HRTimeline
OBERWEIS ASSET MANAGEMENT INC/514,000$11.2M0.43%013F-HRTimeline
NEW YORK STATE COMMON RETIREMENT FUND474,457$10.3M0.01%-18,76813F-HRTimeline
KING LUTHER CAPITAL MANAGEMENT CORP449,960$9.8M0.04%-110,82613F-HRTimeline
TUDOR INVESTMENT CORP ET AL449,109$9.78M0.06%new13F-HR/ATimeline
NORDEA INVESTMENT MANAGEMENT ABin group NORDEA INVESTMENT MANAGEMENT …447,340$9.69M0.01%+116,42313F-HRTimelineGroup
Norwood Investment Partners, LP430,000$9.37M8.05%-32,00013F-HRTimeline
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …413,150$9M0.01%-201,16713F-HRTimelineGroup
Dana Investment Advisors, Inc.409,121$8.91M0.26%-176,79413F-HRTimeline
GRIZZLYROCK CAPITAL, LLC390,906$8.51M6.61%-583,41713F-HRTimeline
PICTON MAHONEY ASSET MANAGEMENT387,332$8.44M0.11%+259,48213F-HRTimeline
VOLORIDGE INVESTMENT MANAGEMENT, LLC375,212$8.17M0.03%new13F-HRTimeline
Manatuck Hill Partners, LLC349,291$7.61M2.59%+40,80013F-HRTimeline
1492 Capital Management LLC336,666$7.33M2.97%+14,74513F-HRTimeline
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC310,653$6.77M<0.01%-82,94813F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…309,604$6.74M0.01%-12,59613F-HRTimelineGroup
Point72 Asset Management, L.P.in group Point72 Asset Management, L.P.305,316$6.65M0.01%new13F-HRTimelineGroup
FIRST TRUST ADVISORS LPin group FIRST TRUST ADVISORS LP304,887$6.64M<0.01%+235,38813F-HRTimelineGroup
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP300,431$6.54M0.01%+62,60513F-HRTimelineGroup
Swiss National Bank272,600$5.94M<0.01%013F-HRTimeline
S SQUARED TECHNOLOGY, LLC267,862$5.83M2.22%-38,75913F-HRTimeline
CANNELL CAPITAL LLC265,152$5.78M1.52%+138,57413F-HRTimeline
Invesco Ltd.in group Invesco Ltd.258,732$5.64M<0.01%+28,43913F-HRTimelineGroup
Alta Park Capital, LP255,698$5.57M0.56%-157,90413F-HRTimeline
Kopion Asset Management, LLCin group Kopion Asset Management, LLC246,601$5.37M3.48%-176,57713F-HRTimelineGroup
Dilation Capital Management LP245,900$5.36M2.65%-88,82513F-HRTimeline
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/241,332$5.26M<0.01%-1,01413F-HRTimelineGroup
Informed Momentum Co LLC241,943$5.18M0.59%+24,46513F-HRTimeline
RHUMBLINE ADVISERS217,307$4.73M<0.01%-6,11913F-HRTimeline
Polar Asset Management Partners Inc.213,866$4.66M0.09%new13F-HR/ATimeline
COMMONWEALTH EQUITY SERVICES, LLC212,318$4.62M0.01%+17,33813F-HRTimeline
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.211,433$4.61M<0.01%+179,48613F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC210,655$4.59M<0.01%-63,53813F-HR/ATimelineGroup
Qube Research & Technologies Ltd208,938$4.55M0.01%new13F-HRTimeline
STATE OF WISCONSIN INVESTMENT BOARD206,905$4.51M0.01%+20,91113F-HRTimeline
AYAL Capital Advisors Ltd199,000$4.33M2.5%+33,06313F-HRTimeline
MOODY NATIONAL BANK TRUST DIVISIONin group MOODY NATIONAL BANK TRUST DIV…197,792$4.31M0.36%+36,46013F-HRTimelineGroup
CASTLEARK MANAGEMENT LLC193,185$4.21M0.12%+50,03513F-HRTimeline
Lisanti Capital Growth, LLC189,168$4.12M1.01%-178,84713F-HRTimeline
VOYA INVESTMENT MANAGEMENT LLCgroup of 2 filers holding188,092$4.1M-52,222Timeline
HARBOR CAPITAL ADVISORS, INC.172,171$3.75M0.29%-461,97613F-HRTimeline
ENVESTNET ASSET MANAGEMENT INCin group ENVESTNET ASSET MANAGEMENT INC170,152$3.71M<0.01%-71,78613F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC169,561$3.69M<0.01%-665,54113F-HRTimelineGroup
Squarepoint Ops LLCin group Squarepoint Ops LLC166,469$3.63M0.01%new13F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC163,343$3.56M<0.01%-75,14913F-HRTimelineGroup
PRINCIPAL FINANCIAL GROUP INCgroup of 2 filers holding162,440$3.54M+55,363Timeline
Advantage Alpha Capital Partners LP160,447$3.49M1.05%-182,12813F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc160,437$3.49M<0.01%+5,21213F-HRTimelineGroup
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC150,495$3.28M<0.01%+44,23113F-HRTimelineGroup
EFG Asset Management (North America) Co…150,511$3.28M0.42%-50,49113F-HRTimeline
Bridgewater Associates, LP145,671$3.17M0.01%new13F-HRTimeline
ALLIANCEBERNSTEIN L.P.144,645$3.15M<0.01%+7,70013F-HRTimeline
Hilton Capital Management, LLC141,058$3.07M0.25%+7,49213F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN137,721$3M<0.01%+26,32413F-HRTimelineGroup
RICE HALL JAMES & ASSOCIATES, LLC133,218$2.9M0.16%-21,67913F-HRTimeline
Campbell & CO Investment Adviser LLC132,785$2.89M0.22%new13F-HRTimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…132,581$2.89M<0.01%+613F-HRTimeline
PERKINS CAPITAL MANAGEMENT INC131,275$2.86M2.52%-3,85013F-HRTimeline
WEDGE CAPITAL MANAGEMENT L L P/NC130,779$2.85M0.05%+23,14513F-HRTimeline
Parallax Volatility Advisers, L.P.130,683$2.85M0.08%-45,13013F-HRTimeline
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\129,651$2.82M<0.01%-12,15013F-HRTimelineGroup
Panoramic Capital, LLC126,080$2.75M1.74%+56,08013F-HRTimeline
Nippon Life Global Investors Americas, …120,350$2.62M0.11%new13F-HRTimeline
FRANKLIN RESOURCES INCin group Franklin Resources117,484$2.56M<0.01%+9,03313F-HRTimelineGroup
SIMPLEX TRADING, LLC117,045$2.55M0.06%+64,21113F-HRTimeline
PRELUDE CAPITAL MANAGEMENT, LLC113,649$2.48M0.19%-39,90213F-HRTimeline
GROUP ONE TRADING LLC110,315$2.4M0.07%+3,22613F-HRTimeline
LPL Financial LLC109,867$2.39M<0.01%+3,32013F-HRTimeline
Cerity Partners LLCin group Cerity Partners LLC100,553$2.19M<0.01%-1,18813F-HRTimelineGroup
P.A.W. CAPITAL CORP100,000$2.18M3.95%-30,00013F-HRTimeline
Zweig-DiMenna Associates LLC99,900$2.18M0.17%-11,60013F-HRTimeline
Tidal Investments LLCin group Tidal Investments LLC99,086$2.16M0.01%+5,91813F-HRTimelineGroup
COMERICA BANK98,157$2.14M0.01%-43,46013F-HRTimeline
CLOUGH CAPITAL PARTNERS L Pin group CLOUGH CAPITAL PARTNERS L P94,652$2.06M0.18%-90,62513F-HRTimelineGroup
State of New Jersey Common Pension Fund…in group State of New Jersey Common Pe…94,452$2.06M0.01%new13F-HRTimelineGroup
Verition Fund Management LLC88,296$1.92M0.01%-507,19913F-HRTimeline
MetLife Investment Management, LLCin group MetLife Investment Management…81,500$1.78M0.01%-2,04113F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd81,445$1.77M0.09%new13F-HRTimelineGroup
SEI INVESTMENTS COin group SEI INVESTMENTS CO74,983$1.63M<0.01%-7,13313F-HRTimelineGroup
CenterBook Partners LP72,786$1.59M0.08%-19,48013F-HRTimeline
Cubist Systematic Strategies, LLC71,251$1.55M0.02%new13F-HRTimeline
DARK FOREST CAPITAL MANAGEMENT LP69,509$1.51M0.06%+20,20513F-HR/ATimeline
STEINBERGANNA WEALTH MANAGEMENT69,024$1.5M0.71%13F-HRTimeline
GAMCO Investors (Gabelli)group of 2 filers holding67,289$1.47M-3,114Timeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …67,126$1.46M<0.01%-53513F-HRTimelineGroup
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…65,063$1.42M<0.01%-11,69713F-HRTimelineGroup
BROWN ADVISORY INCin group BROWN ADVISORY INC64,681$1.41M<0.01%new13F-HRTimelineGroup
FOX RUN MANAGEMENT, L.L.C.63,761$1.39M0.22%new13F-HRTimeline
Advisory Services Network, LLC63,613$1.39M0.02%-1,79413F-HRTimeline
ARDSLEY ADVISORY PARTNERS LP60,000$1.31M0.2%-310,00013F-HRTimeline
INTECH INVESTMENT MANAGEMENT LLC59,204$1.29M0.01%-14,16713F-HRTimeline
STIFEL FINANCIAL CORPin group STIFEL FINANCIAL CORP59,131$1.29M<0.01%-19,66813F-HRTimelineGroup
BOOTHBAY FUND MANAGEMENT, LLC58,877$1.28M0.03%+14,52813F-HRTimeline
JANUS HENDERSON GROUP PLCin group Janus Henderson58,423$1.27M<0.01%013F-HRTimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.47,207$1.2M<0.01%-4,06413F-HRTimelineGroup
Calamos Advisors LLCin group Calamos Advisors LLC51,785$1.13M<0.01%-92513F-HRTimelineGroup
Zurcher Kantonalbank (Zurich Cantonalba…48,871$1.06M<0.01%013F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC48,071$1.05M<0.01%+27,11113F-HRTimelineGroup
ALGERT GLOBAL LLC47,270$1.03M0.02%new13F-HR/ATimeline
VICTORY CAPITAL MANAGEMENT INC46,301$1.01M<0.01%+2,90213F-HRTimeline
PINNACLE ASSOCIATES LTD45,825$998K0.01%-21,19513F-HRTimeline
CANADA LIFE ASSURANCE Coin group CANADA LIFE ASSURANCE Co44,552$992K<0.01%+1,04713F-HRTimelineGroup
STRS OHIO43,900$956K<0.01%+1,70013F-HRTimeline
Homestead Advisers Corp43,900$956K0.02%new13F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA43,690$951K<0.01%-3,58813F-HRTimelineGroup
HSBC HOLDINGS PLCin group HSBC HOLDINGS PLC42,329$917K<0.01%+24,28913F-HRTimelineGroup
ARIZONA STATE RETIREMENT SYSTEM41,740$909K<0.01%+7013F-HRTimeline
SG Americas Securities, LLC41,593$906K<0.01%+21513F-HRTimeline
JENNISON ASSOCIATES LLC40,431$881K<0.01%new13F-HRTimeline
Radcliffe Capital Management, L.P.40,000$871K0.05%-10,00013F-HRTimeline
Thrivent Financial for Lutheransin group Thrivent Financial for Luther…39,646$863K<0.01%-63,25813F-HRTimelineGroup
Police & Firemen's Retirement System of…39,298$856K0.01%+7,68013F-HRTimeline
STATE BOARD OF ADMINISTRATION OF FLORID…38,231$833K<0.01%013F-HRTimeline
Virtu Financial LLCin group Virtu Financial LLC37,311$813K0.05%new13F-HRTimelineGroup
Cardinal Point Capital Management ULC37,100$808K0.06%-12,00013F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS36,241$789K<0.01%+17,68713F-HRTimelineGroup
Legato Capital Management LLC35,220$767K0.08%-35,26013F-HRTimeline
SIERRA SUMMIT ADVISORS LLC34,632$754K0.11%new13F-HRTimeline
Allspring Global Investments Holdings, …in group Allspring Global Investments …34,186$745K<0.01%-33813F-HRTimelineGroup
Ensign Peak Advisors, Inc33,908$739K<0.01%-24,60013F-HR/ATimeline
Cetera Investment Advisers33,670$733K<0.01%-5,49313F-HRTimeline
Jain Global LLC32,447$707K0.01%new13F-HRTimeline
Fulton Bank, N.A.31,637$689K0.02%-29813F-HRTimeline
TD Asset Management Inc30,740$670K<0.01%new13F-HRTimeline
Handelsbanken Fonder AB30,100$656K<0.01%013F-HRTimeline
Clear Creek Financial Management, LLC30,032$654K0.06%+5,56913F-HRTimeline
KLP KAPITALFORVALTNING AS29,100$634K<0.01%013F-HRTimeline
BAILARD, INC.29,079$633K0.01%new13F-HRTimeline
Penbrook Management LLC28,420$619K0.43%013F-HRTimeline
GREENWOOD CAPITAL ASSOCIATES LLC26,343$574K0.07%-13,83213F-HRTimeline
Verdence Capital Advisors LLC27,647$555K0.03%+1,45113F-HRTimeline
TEACHERS RETIREMENT SYSTEM OF THE STATE…25,201$549K<0.01%new13F-HRTimeline
Moran Wealth Management, LLC25,121$547K0.02%new13F-HRTimeline
ProShare Advisors LLC23,946$522K<0.01%-4,77213F-HRTimeline
Quantinno Capital Management LP23,576$513K<0.01%+4,06513F-HRTimeline
TRUIST FINANCIAL CORPin group TRUIST FINANCIAL CORP23,122$504K<0.01%-5,19113F-HRTimelineGroup
FEDERATED HERMES, INC.in group FEDERATED HERMES, INC.23,100$503K<0.01%new13F-HRTimelineGroup
PITCAIRN COin group PITCAIRN CO22,802$497K0.04%-3,51313F-HRTimelineGroup
Pictet Asset Management Holding SAin group Pictet Asset Management Holdi…22,641$493K<0.01%013F-HRTimelineGroup
Counterpoint Mutual Funds LLC22,156$483K0.04%new13F-HRTimeline
Creative Planningin group Creative Planning21,893$477K<0.01%+10,76213F-HRTimelineGroup
Diametric Capital, LP21,622$471K0.17%-11,53713F-HRTimeline
Outlook Wealth Advisors, LLC20,266$441K0.11%-20813F-HRTimeline
Northwest & Ethical Investments L.P.19,560$436K0.01%+10,86013F-HRTimeline
GRIFFIN ASSET MANAGEMENT, INC.19,935$434K0.05%013F-HRTimeline
TEACHER RETIREMENT SYSTEM OF TEXAS18,391$401K<0.01%-3,21213F-HRTimeline
PRUDENTIAL FINANCIAL INCin group PRUDENTIAL FINANCIAL INC18,114$395K<0.01%+15513F-HRTimelineGroup
Walleye Capital LLCgroup of 2 filers holding17,280$376K-8,688Timeline
Vident Advisory, LLCin group Vident Advisory, LLC16,621$362K<0.01%-1,22513F-HRTimelineGroup
Numerai GP LLC16,327$356K0.05%new13F-HRTimeline
Magnetar Financial LLCin group Magnetar Financial LLC15,189$331K<0.01%new13F-HRTimelineGroup
CIBC Bancorp USA Inc.group of 2 filers holding14,980$326K+14,929Timeline
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION…14,986$326K<0.01%013F-HRTimeline
HighTower Advisors, LLC14,780$322K<0.01%+95313F-HRTimeline
WOODMONT INVESTMENT COUNSEL LLC14,250$310K0.02%-5013F-HRTimeline
Ledgewood Wealth Advisors, LLC14,097$307K0.18%-5,69813F-HRTimeline
Winthrop Advisory Group LLC14,080$307K0.03%+8013F-HRTimeline
AlphaQuest LLC13,491$294K0.02%+1,04413F-HRTimeline
CAPTRUST FINANCIAL ADVISORS13,248$289K<0.01%-3,33713F-HRTimeline