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Disclosery

MAX MEDIAALPHA INC

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CL A (common), issuer CIK 1818383

157 managers (163 13F filers) reported a position in MAX shares at 2026-03-31, 48,491,820 shares in all. 29 filers opened a position and 43 filers sold out during the quarter.

Managers
157
13F filers
163
New
29
Added
59
Reduced
55
Sold out
43
Shares held by filers
48,491,820

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

The latest Form 4 transactions, non-derivative.
OwnerDateSharesPriceFiling
Yi Stevendirector, officer (See Remarks)2026-10-09-2,033 S$11.0068Form 4
Yi Stevendirector, officer (See Remarks)2026-10-08-24,000 S$10.0393Form 4

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
WHITE MOUNTAINS INSURANCE GROUP LTD17,856,614$166M52.99%013F-HRTimeline
BlackRock, Inc.in group BlackRock, Inc.3,476,687$32.3M<0.01%-74,77813F-HRTimelineGroup
Clearline Capital LP2,590,670$24.1M1.87%+1,289,21713F-HRTimeline
VANGUARD GROUP INCgroup of 6 filers holding2,221,712$20.7MnewTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO1,745,679$16.5M<0.01%+377,78313F-HR/ATimelineGroup
J. Goldman & Co LP1,182,673$11M0.51%+396,30413F-HRTimeline
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC1,070,084$9.95M<0.01%+292,78013F-HRTimelineGroup
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPin group ARROWSTREET CAPITAL, LIMITED …1,061,981$9.88M0.01%+206,07713F-HRTimelineGroup
JACOBS ASSET MANAGEMENT, LLC924,443$8.6M5.15%+219,14413F-HRTimeline
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC847,199$7.87M0.01%+241,02813F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP838,161$7.79M<0.01%+106,75413F-HRTimelineGroup
Shay Capital LLC775,000$7.21M1.02%+184,00013F-HRTimeline
JACOBS LEVY EQUITY MANAGEMENT, INC750,054$6.98M0.03%+49,55713F-HRTimeline
RENAISSANCE TECHNOLOGIES LLC719,300$6.69M0.01%-326,10013F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY703,018$6.54M<0.01%-257,13613F-HRTimelineGroup
Nuveen, LLCin group TIAA701,399$6.52M<0.01%+34,86013F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC623,421$5.8M<0.01%-105,94613F-HRTimelineGroup
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP620,669$5.77M<0.01%+300,87113F-HRTimelineGroup
SPEECE THORSON CAPITAL GROUP INC499,011$4.64M1.06%new13F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC481,951$4.48M<0.01%-322,14413F-HRTimelineGroup
Philadelphia Financial Management of Sa…480,000$4.46M1.43%new13F-HRTimeline
Qube Research & Technologies Ltd415,280$3.86M0.01%+131,26813F-HRTimeline
FRANKLIN RESOURCES INCin group Franklin Resources343,709$3.2M<0.01%+14,99713F-HRTimelineGroup
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.342,058$3.18M<0.01%-55,32213F-HRTimelineGroup
UBS Group AGgroup of 2 filers holding334,394$3.11M+209,620Timeline
Triad Investment Management333,864$3.1M3.67%+58,42713F-HR/ATimeline
HRT FINANCIAL LP329,332$3.06M0.01%+220,30913F-HRTimeline
ALLIANCEBERNSTEIN L.P.205,440$2.66M<0.01%+171,51013F-HRTimeline
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC283,008$2.63M<0.01%-77,12113F-HRTimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/279,704$2.6M<0.01%+221,54013F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co274,339$2.55M<0.01%-5,47813F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP271,824$2.53M<0.01%+4,54613F-HRTimelineGroup
Pacer Advisors, Inc.258,250$2.4M0.01%-4,77413F-HR/ATimeline
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC229,323$2.13M<0.01%+59,67613F-HRTimelineGroup
Stoic Point Capital Management LLC221,041$2.06M2.02%+13,74313F-HRTimeline
Squarepoint Ops LLCin group Squarepoint Ops LLC215,541$2M<0.01%+91,25313F-HRTimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…189,736$1.76M<0.01%+108,74613F-HRTimelineGroup
TEACHER RETIREMENT SYSTEM OF TEXAS185,325$1.72M0.01%+174,34713F-HRTimeline
TWO SIGMA INVESTMENTS, LPin group TWO SIGMA INVESTMENTS, LP175,289$1.63M<0.01%+115,42913F-HRTimelineGroup
Y-Intercept (Hong Kong) Ltd158,170$1.47M0.03%-52,18213F-HRTimeline
Caption Management, LLC149,048$1.39M0.07%new13F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd146,838$1.37M0.02%+56,13613F-HRTimelineGroup
PRINCIPAL FINANCIAL GROUP INCin group PRINCIPAL FINANCIAL GROUP INC137,613$1.28M<0.01%+102,21013F-HRTimelineGroup
Man Group plcin group Man Group plc136,707$1.27M<0.01%+25,83113F-HRTimelineGroup
GSA CAPITAL PARTNERS LLP109,268$1.02M0.06%+62,48413F-HRTimeline
Balyasny Asset Management L.P.in group Balyasny Asset Management108,808$1.01M<0.01%-75,35113F-HRTimelineGroup
Quantinno Capital Management LP107,274$998K<0.01%+64,52613F-HRTimeline
STATE OF WISCONSIN INVESTMENT BOARD106,160$987K<0.01%+59,31813F-HRTimeline
PDT Partners, LLC90,022$837K0.05%-75,51813F-HRTimeline
VICTORY CAPITAL MANAGEMENT INC87,269$812K<0.01%-642,18813F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp86,955$809K<0.01%-35713F-HRTimelineGroup
Divisadero Street Capital Management, LPin group Divisadero Street Capital Man…86,907$808K0.04%-762,10413F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…84,894$794K<0.01%-5,94913F-HRTimelineGroup
ALGERT GLOBAL LLC84,510$786K0.01%new13F-HR/ATimeline
GLOBEFLEX CAPITAL L P80,233$746K0.11%013F-HRTimeline
Amundiin group Amundi78,104$726K<0.01%+19,48813F-HRTimelineGroup
Allianz Asset Management GmbHin group Allianz SE70,176$653K<0.01%013F-HRTimelineGroup
Swiss National Bank58,700$546K<0.01%013F-HRTimeline
Mariner, LLCin group Mariner, LLC58,489$544K<0.01%-11,40213F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS56,206$523K<0.01%-216,94513F-HRTimelineGroup
BLAIR WILLIAM & CO/IL55,975$521K<0.01%-4,17113F-HRTimeline
RHUMBLINE ADVISERS47,884$445K<0.01%-63813F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC47,041$437K<0.01%-704,70413F-HRTimelineGroup
Allspring Global Investments Holdings, …in group Allspring Global Investments …47,885$435K<0.01%+4,93513F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC45,364$422K<0.01%-46,06013F-HRTimelineGroup
Dynamic Technology Lab Private Ltd43,595$405K0.07%new13F-HRTimeline
State of Wyoming43,001$400K0.05%+4,16913F-HRTimeline
Brooklyn Investment Group39,724$369K0.01%+27,68313F-HRTimeline
FOX RUN MANAGEMENT, L.L.C.36,955$349K0.06%+10,92013F-HRTimeline
PRICE T ROWE ASSOCIATES INC /MD/37,076$345K<0.01%+6,06213F-HRTimeline
SEI INVESTMENTS COin group SEI INVESTMENTS CO35,738$332K<0.01%-46,10613F-HRTimelineGroup
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\35,088$326K<0.01%+3,44813F-HRTimelineGroup
IEQ CAPITAL, LLC32,921$306K<0.01%-55,21513F-HRTimeline
Quantbot Technologies LP29,119$271K0.01%new13F-HRTimeline
Legal & General Group Plcin group Legal & General Group Plc27,533$256K<0.01%-6,28413F-HRTimelineGroup
FMR LLCin group FMR LLC27,174$253K<0.01%+22,34713F-HRTimelineGroup
Bridgefront Capital, LLC26,170$243K0.06%new13F-HRTimeline
Abel Hall, LLC25,424$236K0.05%new13F-HRTimeline
Cannell & Spears LLC25,400$236K<0.01%-15013F-HR/ATimeline
CALIFORNIA STATE TEACHERS RETIREMENT SY…25,252$235K<0.01%-25213F-HRTimeline
LOS ANGELES CAPITAL MANAGEMENT LLC23,740$221K<0.01%-48,54513F-HRTimeline
Invesco Ltd.in group Invesco Ltd.23,627$220K<0.01%-2,39713F-HRTimelineGroup
ELKHORN PARTNERS LIMITED PARTNERSHIPin group ELKHORN PARTNERS LIMITED PART…23,000$214K0.14%new13F-HRTimelineGroup
CWM, LLCin group CWM, LLC22,425$209K<0.01%-19,85313F-HRTimelineGroup
MetLife Investment Management, LLCin group MetLife Investment Management…21,402$199K<0.01%013F-HRTimelineGroup
JUPITER ASSET MANAGEMENT LTDin group JUPITER ASSET MANAGEMENT LTD21,172$197K<0.01%new13F-HRTimelineGroup
WEALTH ENHANCEMENT ADVISORY SERVICES, L…20,916$196K<0.01%-5,52113F-HRTimeline
State of Tennessee, Department of Treas…20,728$193K<0.01%+7,82513F-HRTimeline
Creative Planningin group Creative Planning19,946$185K<0.01%-5,32613F-HRTimelineGroup
SG Americas Securities, LLC19,473$181K<0.01%+3,66813F-HRTimeline
Cornerstone Investment Partners, LLC19,008$177K0.01%+4,35813F-HRTimeline
Zurcher Kantonalbank (Zurich Cantonalba…18,642$173K<0.01%013F-HRTimeline
AMERIPRISE FINANCIAL INCin group AMERIPRISE FINANCIAL INC17,807$166K<0.01%new13F-HR/ATimelineGroup
EVENTIDE ASSET MANAGEMENT, LLC17,509$165K<0.01%new13F-HRTimeline
MERCER GLOBAL ADVISORS INC /ADV16,155$150K<0.01%-80513F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…16,132$150K<0.01%+37413F-HRTimelineGroup
Campbell & CO Investment Adviser LLC16,085$150K0.01%new13F-HRTimeline
nVerses Capital, LLC15,790$147K0.13%new13F-HRTimeline
Corient Private Wealth LPin group Corient Private Wealth LP15,559$145K<0.01%new13F-HRTimelineGroup
Cerity Partners LLCin group Cerity Partners LLC15,033$140K<0.01%-5,74413F-HRTimelineGroup
Graham Capital Management, L.P.14,543$135K<0.01%-8,88413F-HRTimeline
MACKENZIE FINANCIAL CORP14,293$133K<0.01%-28,68213F-HRTimeline
Schonfeld Strategic Advisors LLC13,917$129K<0.01%new13F-HRTimeline
JANUS HENDERSON GROUP PLCin group Janus Henderson13,862$129K<0.01%-252,04413F-HR/ATimelineGroup
GLENMEDE TRUST CO NAin group GLENMEDE TRUST CO NA13,150$122K<0.01%new13F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN12,325$115K<0.01%-24,74713F-HR/ATimelineGroup
Mach-1 Financial Group, LLC11,957$111K0.04%new13F-HRTimeline
Cresset Asset Management, LLC11,395$106K<0.01%-86713F-HRTimeline
VIRGINIA RETIREMENT SYSTEMS ET Al11,200$104K<0.01%-6,50013F-HRTimeline
BANK OF MONTREAL /CAN/in group BANK OF MONTREAL /CAN/10,494$97.6K<0.01%new13F-HRTimelineGroup
Aaron Wealth Advisors LLC10,242$95.3K0.01%new13F-HRTimeline
Jefferies Financial Group Inc.in group Jefferies Financial Group Inc.10,000$93K<0.01%new13F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC9,978$92.8K<0.01%+1,68513F-HRTimelineGroup
Police & Firemen's Retirement System of…9,690$90.1K<0.01%013F-HRTimeline
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF O…9,100$84.6K<0.01%new13F-HRTimeline
SIMPLEX TRADING, LLC6,846$63.7K<0.01%+2,97113F-HRTimeline
Essential Partners LLC6,457$60K0.02%+51813F-HRTimeline
NEW YORK STATE COMMON RETIREMENT FUND6,264$58.3K<0.01%013F-HRTimeline
KLP KAPITALFORVALTNING AS5,933$55.2K<0.01%013F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA5,737$53K<0.01%-78213F-HRTimelineGroup
Covestor Ltd3,453$32K0.02%+6013F-HRTimeline
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…3,127$29.1K<0.01%+32213F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…3,087$28.7K<0.01%+91013F-HRTimelineGroup
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…3,026$28.1K<0.01%013F-HRTimelineGroup
State of Alaska, Department of Revenue1,862$17K<0.01%013F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…1,261$11.7K<0.01%-78413F-HR/ATimelineGroup
Arax Advisory Partners1,172$10.9K<0.01%+7313F-HRTimeline
Allworth Financial LP1,105$10.3K<0.01%-15613F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.1,037$9.64K<0.01%-9213F-HRTimelineGroup
Private Wealth Asset Management, LLC1,000$9.3K<0.01%new13F-HRTimeline
Versant Capital Management, Inc999$9.29K<0.01%+92113F-HRTimeline
SUMMIT SECURITIES GROUP LLC557$5.18K<0.01%new13F-HRTimeline
Murphy & Mullick Capital Management Corp500$4.65K<0.01%013F-HRTimeline
FEDERATED HERMES, INC.in group FEDERATED HERMES, INC.472$4.39K<0.01%-85113F-HRTimelineGroup
GAMMA Investing LLC446$4.15K<0.01%+25913F-HRTimeline
HUNTINGTON NATIONAL BANKin group HUNTINGTON NATIONAL BANK397$3.69K<0.01%new13F-HRTimelineGroup
Parallel Advisors, LLC376$3.5K<0.01%+29213F-HR/ATimeline
Farther Finance Advisors, LLC248$2.25K<0.01%+6113F-HRTimeline
ROTHSCHILD INVESTMENT LLC237$2.2K<0.01%-10313F-HRTimeline
Optiver Holding B.V.in group Optiver Holding B.V.230$2.14K<0.01%-4013F-HR/ATimelineGroup
Sterling Capital Management LLC217$2.02K<0.01%013F-HRTimeline
Marquette Asset Management, LLC198$1.84K<0.01%-4513F-HRTimeline
GROUP ONE TRADING LLC185$1.72K<0.01%-2,14413F-HRTimeline
US BANCORP \DE\in group US BANCORP \DE\182$1.69K<0.01%-32113F-HRTimelineGroup
Root Financial Partners, LLC139$1.29K<0.01%new13F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…135$1.26K<0.01%+6013F-HRTimelineGroup
NISA INVESTMENT ADVISORS, LLC135$1.26K<0.01%-6613F-HRTimeline
IFP Advisors, Inc134$1.25K<0.01%-57413F-HRTimeline
NEW YORK STATE TEACHERS RETIREMENT SYST…100$1K<0.01%new13F-HRTimeline
Caitong International Asset Management …105$976<0.01%+5813F-HRTimeline
Wealth Preservation Advisors, LLC66$614<0.01%new13F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP57$517<0.01%-2,25613F-HRTimelineGroup
Investors Portfolio Services LLC61$515<0.01%new13F-HRTimeline
True Wealth Design, LLC51$475<0.01%-28513F-HRTimeline
Smartleaf Asset Management LLC44$415<0.01%013F-HRTimeline
MAI Capital Management25$233<0.01%+1113F-HRTimeline
SJS Investment Consulting Inc.9$84<0.01%-1513F-HRTimeline

Events

  • Yi Steven sold 26,033 MAX shares between 2026-10-08 and 2026-10-09, Form 4 filed 2026-10-09. 0001818383-26-000249

    Accepted , ingested