Stock Ownership/MGNI

MAGNITE INC (MGNI): Ownership & Insider Activity

Hedge funds and institutional managers reporting a position in MGNI · Communication Services. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.

Reported Holders
20
13F filers
Aggregate Value
$125.4M
Across holders
Last Price
$23.56
2026-08-24
Sector
Communication Services
GICS
Quarterly fund activity10 increased9 reduced4 exited
Full exits: TUDOR INVESTMENT CORP ET AL, Holocene Advisors, LP, Gotham Asset Management, LLC, Brevan Howard Capital Management LP
Institutional Holders of MGNI
↗
20 holders
Manager⇅Type⇅Shares⇅Market Value▼% of Total⇅% of Portfolio⇅Action⇅QoQ Change⇅Quarter⇅
Qube Research & Technologies Ltd
CIK 0001729829
Hedge Fund1.96M$37.1M29.6%0.0%Added+$24.6MQ2 2026
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
Hedge Fund765K$14.5M11.6%0.0%Reduced$-8.9MQ2 2026
First Eagle Investment Management, LLC
CIK 0001325447
Institutional Manager671K$12.7M10.2%0.0%Added+$4.2MQ2 2026
BALYASNY ASSET MANAGEMENT LLC
CIK 0001218710
Hedge Fund667K$12.7M10.1%0.0%Reduced$-15.8MQ2 2026
Schonfeld Strategic Advisors LLC
CIK 0001665241
Hedge Fund562K$10.7M8.5%0.0%Reduced$-19.8MQ2 2026
CITADEL ADVISORS LLC
CIK 0001423053
Hedge Fund473K$9.0M7.2%0.0%Reduced$-30.5MQ2 2026
MARSHALL WACE, LLP
CIK 0001318757
Hedge Fund342K$6.5M5.2%0.0%Added+$6.0MQ2 2026
ExodusPoint Capital Management, LP
CIK 0001736225
Hedge Fund272K$5.2M4.1%0.0%Added—Q2 2026
Squarepoint Ops LLC
CIK 0001642575
Hedge Fund230K$4.4M3.5%0.0%Reduced$-16.3MQ2 2026
Senvest Management, LLC
CIK 0001328785
Hedge Fund224K$4.3M3.4%0.1%Unchanged+$0Q2 2026
Qube Research & Technologies LtdAdded
Hedge Fund
$37.1M· 29.6% of total· 0.0% port· 1.96M sh· +$24.6M QoQ· Q2 2026
MILLENNIUM MANAGEMENT LLCReduced
Hedge Fund
$14.5M· 11.6% of total· 0.0% port· 765K sh· $-8.9M QoQ· Q2 2026
First Eagle Investment Management, LLCAdded
Institutional Manager
$12.7M· 10.2% of total· 0.0% port· 671K sh· +$4.2M QoQ· Q2 2026
BALYASNY ASSET MANAGEMENT LLCReduced
Hedge Fund
$12.7M· 10.1% of total· 0.0% port· 667K sh· $-15.8M QoQ· Q2 2026
Schonfeld Strategic Advisors LLCReduced
Hedge Fund
$10.7M· 8.5% of total· 0.0% port· 562K sh· $-19.8M QoQ· Q2 2026
CITADEL ADVISORS LLCReduced
Hedge Fund
$9.0M· 7.2% of total· 0.0% port· 473K sh· $-30.5M QoQ· Q2 2026
MARSHALL WACE, LLPAdded
Hedge Fund
$6.5M· 5.2% of total· 0.0% port· 342K sh· +$6.0M QoQ· Q2 2026
ExodusPoint Capital Management, LPAdded
Hedge Fund
$5.2M· 4.1% of total· 0.0% port· 272K sh· — QoQ· Q2 2026
Squarepoint Ops LLCReduced
Hedge Fund
$4.4M· 3.5% of total· 0.0% port· 230K sh· $-16.3M QoQ· Q2 2026
Senvest Management, LLCUnchanged
Hedge Fund
$4.3M· 3.4% of total· 0.1% port· 224K sh· +$0 QoQ· Q2 2026
AQR CAPITAL MANAGEMENT LLCAdded
Hedge Fund
$3.4M· 2.7% of total· 0.0% port· 177K sh· $-10.2M QoQ· Q2 2026
GAMCO INVESTORS, INC. ET ALAdded
Institutional Manager
$1.2M· 1.0% of total· 0.0% port· 63K sh· +$46K QoQ· Q2 2026
Man Group plcReduced
Hedge Fund
$1.0M· 0.8% of total· 0.0% port· 53K sh· $-10.9M QoQ· Q2 2026
TWO SIGMA INVESTMENTS, LPReduced
Hedge Fund
$810K· 0.6% of total· 0.0% port· 43K sh· $-6.7M QoQ· Q2 2026
SHAW D E & CO INCAdded
Hedge Fund
$678K· 0.5% of total· 0.0% port· 36K sh· — QoQ· Q2 2026
JUPITER ASSET MANAGEMENT LTDReduced
Hedge Fund
$506K· 0.4% of total· 0.0% port· 27K sh· $-812K QoQ· Q2 2026
Lighthouse Investment Partners, LLCAdded
Hedge Fund
$417K· 0.3% of total· 0.0% port· 22K sh· — QoQ· Q2 2026
Parallax Volatility Advisers, L.P.Added
Hedge Fund
$318K· 0.3% of total· 0.0% port· 17K sh· +$69K QoQ· Q2 2026
Rockefeller Capital Management L.P.Added
Hedge Fund
$95K· 0.1% of total· 0.0% port· 5K sh· +$15K QoQ· Q2 2026
Walleye Capital LLCReduced
Hedge Fund
$46K· 0.0% of total· 0.0% port· 2K sh· $-694K QoQ· Q2 2026
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