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Disclosery

MAX MEDIAALPHA INC

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CL A (common), issuer CIK 1818383

155 managers (157 13F filers) reported a position in MAX shares at 2025-09-30, 47,839,980 shares in all. 26 filers opened a position and 21 filers sold out during the quarter.

Managers
155
13F filers
157
New
26
Added
65
Reduced
47
Sold out
21
Shares held by filers
47,839,980

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, 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
WHITE MOUNTAINS INSURANCE GROUP LTD17,856,614$203M100%013F-HRTimeline
BlackRock, Inc.in group BlackRock, Inc.3,573,190$40.7M<0.01%-430,22913F-HRTimelineGroup
VANGUARD GROUP INCin group VANGUARD GROUP INC2,600,621$29.6M<0.01%-258,57813F-HRTimelineGroup
Broad Bay Capital Management, LP1,468,695$16.7M2.08%-1,029,81213F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC1,429,556$16.3M0.01%+1,246,49313F-HRTimelineGroup
Clearline Capital LP1,290,849$14.7M1.27%-134,45913F-HRTimeline
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC1,279,960$14.6M<0.01%-727,22613F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO1,058,441$12M<0.01%+516,19513F-HR/ATimelineGroup
RENAISSANCE TECHNOLOGIES LLC945,100$10.8M0.01%+172,80013F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY872,031$9.92M<0.01%+116,10513F-HR/ATimelineGroup
JACOBS ASSET MANAGEMENT, LLC819,026$9.32M5.1%+20,36013F-HRTimeline
Shay Capital LLC790,100$8.99M1.63%+120,10013F-HRTimeline
AQR CAPITAL MANAGEMENT LLCin group AQR CAPITAL MANAGEMENT LLC770,679$8.77M0.01%+169,08613F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC769,774$8.76M<0.01%+5,07213F-HRTimelineGroup
VICTORY CAPITAL MANAGEMENT INC710,819$8.09M<0.01%+658,62513F-HRTimeline
Nuveen, LLCin group TIAA690,465$7.86M<0.01%-210,32513F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP672,126$7.65M<0.01%+19,28813F-HRTimelineGroup
JACOBS LEVY EQUITY MANAGEMENT, INC560,765$6.38M0.03%+91,20413F-HRTimeline
J. Goldman & Co LP531,027$6.04M0.23%+356,02713F-HRTimeline
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPin group ARROWSTREET CAPITAL, LIMITED …520,452$5.92M<0.01%+36,11013F-HRTimelineGroup
Qube Research & Technologies Ltd504,342$5.74M0.01%-22,00713F-HRTimeline
D. E. Shaw & Co., Inc.in group D. E. Shaw & Co., Inc.454,883$5.18M<0.01%-440,46513F-HRTimelineGroup
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC419,839$4.77M0.01%-112,59813F-HRTimelineGroup
JANUS HENDERSON GROUP PLCin group Janus Henderson386,155$4.39M<0.01%-246,73313F-HRTimelineGroup
G2 Investment Partners Management LLC375,473$4.27M0.88%new13F-HRTimeline
Lighthouse Investment Partners, LLCin group Lighthouse Investment Partner…353,930$4.03M0.15%+315,94313F-HRTimelineGroup
FRANKLIN RESOURCES INCin group Franklin Resources317,972$3.62M<0.01%+297,85513F-HRTimelineGroup
LAZARD ASSET MANAGEMENT LLCin group LAZARD ASSET MANAGEMENT LLC294,796$3.35M<0.01%-95,01013F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP287,762$3.27M<0.01%+9,83513F-HRTimelineGroup
CHARLES SCHWAB INVESTMENT MANAGEMENT INCin group Charles Schwab Trust Co279,734$3.18M<0.01%-31,85713F-HRTimelineGroup
ALGERT GLOBAL LLC275,387$3.13M0.05%+46,60913F-HR/ATimeline
EARNEST PARTNERS LLC269,607$3.07M0.01%013F-HRTimeline
Pacer Advisors, Inc.246,427$2.8M0.01%-87,53113F-HRTimeline
UBS Group AGgroup of 2 filers holding209,644$2.39M-442,806Timeline
Y-Intercept (Hong Kong) Ltd207,616$2.36M0.06%+44,86913F-HRTimeline
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS193,587$2.2M<0.01%+106,53913F-HRTimelineGroup
MARSHALL WACE, LLPin group MARSHALL WACE, LLP182,743$2.08M<0.01%+17,11613F-HRTimelineGroup
JANE STREET GROUP, LLCin group JANE STREET GROUP, LLC176,305$2.01M<0.01%new13F-HRTimelineGroup
PDT Partners, LLC165,540$1.88M0.12%013F-HRTimeline
CANADA PENSION PLAN INVESTMENT BOARD130,600$1.49M<0.01%+5,20013F-HRTimeline
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP118,692$1.35M<0.01%+54,58413F-HRTimelineGroup
LOS ANGELES CAPITAL MANAGEMENT LLC104,580$1.19M<0.01%-14,94813F-HRTimeline
Bank of New York Mellon Corpin group Bank of New York Mellon Corp99,144$1.13M<0.01%+4,07213F-HRTimelineGroup
Divisadero Street Capital Management, LPin group Divisadero Street Capital Man…86,907$989K0.05%013F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC85,840$977K<0.01%-27,80813F-HR/ATimelineGroup
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/82,079$934K<0.01%-143,71013F-HR/ATimelineGroup
TEACHER RETIREMENT SYSTEM OF TEXAS80,530$916K<0.01%-69,40313F-HRTimeline
IEQ CAPITAL, LLC79,557$905K<0.01%+34,97913F-HRTimeline
BOOTHBAY FUND MANAGEMENT, LLC70,666$804K0.02%new13F-HRTimeline
Janney Montgomery Scott LLC70,355$801K<0.01%-11,36813F-HRTimeline
Allianz Asset Management GmbHin group Allianz SE70,176$799K<0.01%-10013F-HRTimelineGroup
BLAIR WILLIAM & CO/IL66,197$753K<0.01%+2,19013F-HRTimeline
SUSQUEHANNA INTERNATIONAL GROUP, LLPin group SUSQUEHANNA INTERNATIONAL GRO…64,180$730K<0.01%-27,88713F-HRTimelineGroup
SEI INVESTMENTS COin group SEI INVESTMENTS CO62,721$714K<0.01%-53,30613F-HRTimelineGroup
Mariner, LLCin group Mariner, LLC61,909$705K<0.01%+14,42813F-HRTimelineGroup
Swiss National Bank58,700$668K<0.01%013F-HRTimeline
RHUMBLINE ADVISERS53,590$610K<0.01%-2,03213F-HRTimeline
NOMURA HOLDINGS INCin group NOMURA ASSET MANAGEMENT CO LTD52,965$603K<0.01%+13,95013F-HRTimelineGroup
Russell Investments Group, Ltd.in group Russell Investments Group, Lt…51,634$588K<0.01%-2,54213F-HRTimelineGroup
State of Wyoming46,225$526K0.06%+40,58013F-HRTimeline
Semanteon Capital Management, LP44,583$507K0.64%+34,55813F-HRTimeline
TWO SIGMA INVESTMENTS, LPgroup of 2 filers holding42,924$488K-65,070Timeline
Gotham Asset Management, LLC42,444$483K<0.01%+3,94013F-HRTimeline
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC41,408$471K<0.01%+35,72913F-HRTimelineGroup
Verition Fund Management LLC41,253$469K<0.01%-1,93513F-HRTimeline
ALLIANCEBERNSTEIN L.P.38,630$440K<0.01%013F-HRTimeline
Quantbot Technologies LP38,615$439K0.01%+18,02113F-HRTimeline
Allspring Global Investments Holdings, …in group Allspring Global Investments …39,195$438K<0.01%-38713F-HRTimelineGroup
CWM, LLCin group CWM, LLC38,383$437K<0.01%+15,70213F-HRTimelineGroup
Legal & General Group Plcin group Legal & General Group Plc33,934$386K<0.01%-2,38113F-HRTimelineGroup
Voleon Capital Management LP32,090$365K0.01%+14,04213F-HRTimeline
STATE OF WISCONSIN INVESTMENT BOARD31,191$355K<0.01%-53,54813F-HRTimeline
Jain Global LLC31,143$354K<0.01%new13F-HRTimeline
Squarepoint Ops LLCin group Squarepoint Ops LLC30,658$349K<0.01%-28,00813F-HRTimelineGroup
DEUTSCHE BANK AG\in group DEUTSCHE BANK AG\30,409$346K<0.01%+3,39513F-HRTimelineGroup
CALIFORNIA STATE TEACHERS RETIREMENT SY…30,347$345K<0.01%+113F-HRTimeline
Engineers Gate Manager LP30,058$342K<0.01%-39,12613F-HRTimeline
Universal- Beteiligungs- und Serviceges…in group Universal- Beteiligungs- und …29,864$340K<0.01%-4,75313F-HRTimelineGroup
Dynamic Technology Lab Private Ltd29,237$333K0.06%+18,42913F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd29,074$331K0.02%+15,08913F-HRTimelineGroup
PRICE T ROWE ASSOCIATES INC /MD/28,776$328K<0.01%+4,30113F-HRTimeline
Cerity Partners LLCin group Cerity Partners LLC27,644$315K<0.01%+7,57313F-HRTimelineGroup
PRELUDE CAPITAL MANAGEMENT, LLC26,892$306K0.02%new13F-HRTimeline
Cannell & Spears LLC25,700$292K0.01%-13,40013F-HRTimeline
PRINCIPAL FINANCIAL GROUP INCin group PRINCIPAL FINANCIAL GROUP INC24,716$281K<0.01%new13F-HRTimelineGroup
FourThought Financial Partners, LLC24,691$281K0.02%new13F-HRTimeline
VIRGINIA RETIREMENT SYSTEMS ET Al24,500$279K<0.01%+4,50013F-HRTimeline
PharVision Advisers, LLC24,480$279K0.16%new13F-HRTimeline
SG Americas Securities, LLC24,038$274K<0.01%+13,63313F-HRTimeline
AXQ CAPITAL, LP23,144$263K0.1%new13F-HRTimeline
MetLife Investment Management, LLCin group MetLife Investment Management…21,402$244K<0.01%013F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN20,462$233K<0.01%+3,19513F-HRTimelineGroup
WEALTH ENHANCEMENT ADVISORY SERVICES, L…20,212$227K<0.01%+5,45513F-HRTimeline
Invesco Ltd.in group Invesco Ltd.19,705$224K<0.01%+9,00413F-HRTimelineGroup
Arax Advisory Partners19,656$224K<0.01%+18,62013F-HRTimeline
Creative Planningin group Creative Planning19,529$222K<0.01%+4,19813F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA19,223$218K<0.01%+11,70213F-HRTimelineGroup
VIRTUS ADVISERS, LLCin group Virtus Investment Advisers, L…18,711$213K0.12%013F-HR/ATimelineGroup
Zurcher Kantonalbank (Zurich Cantonalba…18,642$212K<0.01%+6,71413F-HRTimeline
Quantinno Capital Management LP17,253$196K<0.01%new13F-HRTimeline
Corton Capital Inc.16,760$191K0.47%-2,10513F-HRTimeline
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.in group Mirae Asset Global Investment…15,657$178K<0.01%-2,58413F-HRTimelineGroup
Olympiad Research LP15,492$176K0.25%new13F-HRTimeline
MACKENZIE FINANCIAL CORP15,117$172K<0.01%+4,55013F-HRTimeline
Aigen Investment Management, LP13,179$150K0.02%new13F-HRTimeline
MERCER GLOBAL ADVISORS INC /ADV12,840$146K<0.01%new13F-HRTimeline
Virtu Financial LLCin group Virtu Financial LLC12,749$145K0.01%new13F-HRTimelineGroup
Cresset Asset Management, LLC12,448$142K<0.01%new13F-HR/ATimeline
Polymer Capital Management (US) LLC12,409$141K0.02%+9913F-HRTimeline
INTECH INVESTMENT MANAGEMENT LLC12,407$141K<0.01%-6,09513F-HRTimeline
Brevan Howard Capital Management LPin group Brevan Howard Capital Managem…12,289$140K<0.01%-6,17913F-HRTimelineGroup
SUMMIT WEALTH GROUP LLC / CO16,471$136K0.01%new13F-HRTimeline
MANUFACTURERS LIFE INSURANCE COMPANY, T…in group MANUFACTURERS LIFE INSURANCE …11,785$134K<0.01%-97213F-HRTimelineGroup
LPL Financial LLC10,482$119K<0.01%new13F-HRTimeline
Pallas Capital Advisors LLC10,352$118K<0.01%+17713F-HRTimeline
Police & Firemen's Retirement System of…10,040$114K<0.01%+3,21813F-HRTimeline
AlphaQuest LLC9,859$112K0.01%-13,29113F-HRTimeline
NEW YORK STATE COMMON RETIREMENT FUND6,264$71.3K<0.01%013F-HRTimeline
KLP KAPITALFORVALTNING AS5,933$67.5K<0.01%013F-HRTimeline
Essential Partners LLC5,707$64.9K0.02%+35713F-HRTimeline
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…4,398$50K<0.01%-1,15313F-HRTimelineGroup
FMR LLCin group FMR LLC4,107$46.7K<0.01%+1,55913F-HRTimelineGroup
Quarry LP4,087$46.5K0.01%+1,23413F-HRTimeline
CITIGROUP INCin group CITIGROUP INC3,349$38.1K<0.01%-10,51813F-HRTimelineGroup
Ameritas Investment Partners, Inc.in group Ameritas Investment Partners,…3,026$34.4K<0.01%013F-HRTimelineGroup
SIMPLEX TRADING, LLC2,767$31K<0.01%+1,90313F-HRTimeline
Covestor Ltd2,689$31K0.02%-1113F-HRTimeline
GROUP ONE TRADING LLC2,657$30.2K<0.01%new13F-HRTimeline
EverSource Wealth Advisors, LLCin group EverSource Wealth Advisors, L…1,894$21.6K<0.01%+54213F-HRTimelineGroup
State of Alaska, Department of Revenue1,862$21K<0.01%new13F-HRTimeline
AMALGAMATED BANK1,031$12K<0.01%013F-HRTimeline
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.1,062$11.7K<0.01%013F-HRTimelineGroup
Allworth Financial LP973$11.1K<0.01%+47413F-HRTimeline
Murphy & Mullick Capital Management Corp500$6.12K<0.01%013F-HRTimeline
US BANCORP \DE\in group US BANCORP \DE\502$5.71K<0.01%-10,33113F-HRTimelineGroup
Optiver Holding B.V.in group Optiver Holding B.V.372$4.23K<0.01%new13F-HRTimelineGroup
IFP Advisors, Inc326$3.71K<0.01%+19813F-HR/ATimeline
Clearstead Advisors, LLC293$3.33K<0.01%+12513F-HRTimeline
True Wealth Design, LLC240$2.73K<0.01%-6413F-HRTimeline
Farther Finance Advisors, LLC233$2.65K<0.01%new13F-HRTimeline
NISA INVESTMENT ADVISORS, LLC193$2.2K<0.01%013F-HRTimeline
ROTHSCHILD INVESTMENT LLC180$2.05K<0.01%+13013F-HRTimeline
PNC Financial Services Group, Inc.in group PNC Financial Services Group,…166$1.89K<0.01%+3513F-HRTimelineGroup
GAMMA Investing LLC134$1.52K<0.01%+1413F-HRTimeline
Aster Capital Management (DIFC) Ltd128$1.46K<0.01%new13F-HRTimeline
Marquette Asset Management, LLC119$1.35K<0.01%new13F-HRTimeline
Sterling Capital Management LLC81$922<0.01%+1013F-HRTimeline
Parallel Advisors, LLC71$808<0.01%013F-HRTimeline
SIGNATUREFD, LLC39$444<0.01%013F-HRTimeline
Caitong International Asset Management …36$410<0.01%-64213F-HRTimeline
Versant Capital Management, Inc32$364<0.01%013F-HRTimeline
FEDERATED HERMES, INC.in group FEDERATED HERMES, INC.29$330<0.01%new13F-HRTimelineGroup
Sunbelt Securities, Inc.29$330<0.01%new13F-HRTimeline
Rockefeller Capital Management L.P.in group Rockefeller Capital Managemen…28$319<0.01%new13F-HRTimelineGroup
Capital Advisors, Ltd. LLC12$00%013F-HRTimelineValue filed as zero, left out of ratios.

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