Public ownership evidence

Magnite, Inc. Common Stock (MGNI) Ownership Disclosures

Read MGNI insider transactions, institutional 13F filings and Congressional disclosures with report dates, public availability and original receipts.

As of 2026-10-02T20:27:17.000Z

Recent Form 4 activity

2026-10-022026-10-01Sullivan HaasA24,641Not reported
2026-10-022026-10-01Gephart BrianA64,682Not reported
2026-09-182026-09-17Caine PaulS7,500Not reported
2026-09-182026-09-17Knopper Douglas SS37,337Not reported
2026-09-162026-09-14Buonasera DavidS1,165Not reported
2026-09-162026-09-14Spillane Robert FS10,363Not reported
2026-09-112026-09-11Evans Katie SeitzS13,997Not reported
2026-09-112026-09-10Saltz AaronS40,000Not reported
2026-09-112026-09-10Caine PaulS5,000Not reported
2026-09-102026-09-09Evans Katie SeitzS11,100Not reported
2026-09-102026-09-08Evans Katie SeitzS32,285Not reported
2026-09-042026-09-02Buonasera DavidS1,043Not reported
2026-09-042026-09-01Buonasera DavidS5,371Not reported
2026-08-292026-08-28Harden Sarah PatriciaS18,436Not reported
2026-08-292026-08-26Harden Sarah PatriciaS30,550Not reported
2026-08-192026-08-18Buckley Sean PatrickS2,759Not reported
2026-08-192026-08-17Buckley Sean PatrickS8,271Not reported
2026-08-192026-08-14Caine PaulS7,500Not reported
2026-08-132026-08-10Gephart BrianS12,479Not reported
2026-08-132026-08-10Lam RachelS10,000Not reported
2026-08-132026-08-10Caine PaulS5,000Not reported
2026-08-082026-08-06Buonasera DavidS871Not reported
2026-08-082026-08-06Buonasera DavidS2,602Not reported
2026-08-082026-08-06Buonasera DavidS4,176Not reported
2026-08-082026-08-06Buckley Sean PatrickS19,237Not reported
2026-08-082026-08-06Buckley Sean PatrickS47,942Not reported
2026-08-082026-08-06Evans Katie SeitzS20,000Not reported
2026-08-082026-08-06Knopper Douglas SS37,337Not reported
2026-08-082026-08-06BARRETT MICHAEL G.S293,968Not reported
2026-07-182026-07-15BARRETT MICHAEL G.S38,596Not reported
2026-07-152026-07-10Caine PaulS5,000Not reported

90-day public availability window, up to 50 records.

Recent institutional filing receipts

These are raw ticker-matched positions in recent 13F receipts, including amendments. They are not deduplicated current ownership totals. Open the manager profile to inspect its effective filing book.

Cornerstone Financial Management LLC2026-06-302026-08-2934$645None
Corient Private Wealth LP2026-06-302026-08-2825,326$480,690None
First Eagle Investment Management, LLC2026-06-302026-08-25670,788$12,731,556None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-25172,047$3,265,452None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-253,265,452$172,047,000None
GILL CAPITAL PARTNERS, LLC2026-06-302026-08-2175$1,424None
MERCER GLOBAL ADVISORS INC /ADV2026-06-302026-08-2028,374$538,539None
Ensign Peak Advisors, Inc2026-03-312026-08-1913,658$162,257None
Ensign Peak Advisors, Inc2025-12-312026-08-1913,658$221,669None
Ensign Peak Advisors, Inc2025-09-302026-08-1933,908$738,516None
Corient Private Wealth LP2026-06-302026-08-1817,309$328,527None
EFG International AG2026-06-302026-08-151,500$28,470None
DARK FOREST CAPITAL MANAGEMENT LP2026-06-302026-08-15110,985$2,106,495None
SEI INVESTMENTS CO2026-06-302026-08-15164,895$3,129,707None
SEI INVESTMENTS CO2026-06-302026-08-15658$12,480None
Murphy & Mullick Capital Management Corp2026-06-302026-08-158,800$167,024None
Glen Eagle Advisors, LLC2026-06-302026-08-1549$930None
Federation des caisses Desjardins du Quebec2026-06-302026-08-1593$1,765None
CLOUGH CAPITAL PARTNERS L P2026-06-302026-08-15159,586$3,028,942None
Quarry LP2026-06-302026-08-1589$1,689None
Meros Investment Management, LP2026-06-302026-08-15991,335$18,815,538None
Concentric Capital Strategies, LP2026-06-302026-08-15146,698$2,784,328None
Ophir Asset Management Pty Ltd2026-06-302026-08-151,450,061$27,522,158None
Militia Capital Partners, LP2024-12-312026-08-1525,000$398,000None
XTX Topco Ltd2026-06-302026-08-1549,488$939,282None
CHARLES SCHWAB INVESTMENT MANAGEMENT INC2026-06-302026-08-151,203,189$22,836,527None
Sixth Street Partners Management Company, L.P.2026-06-302026-08-151,203,189$22,836,527None
ExodusPoint Capital Management, LP2026-06-302026-08-15271,869$5,160,074None
Qube Research & Technologies Ltd2026-06-302026-08-151,955,989$37,124,671None
Neo Ivy Capital Management2026-06-302026-08-1529,172$553,684None
Diametric Capital, LP2026-06-302026-08-1596,795$1,837,169None
Caption Management, LLC2026-06-302026-08-151,500,000$28,470,000Put
Caption Management, LLC2026-06-302026-08-15354,000$6,718,920Call
Caption Management, LLC2026-06-302026-08-15145,590$2,763,298None
OSAIC HOLDINGS, INC.2026-06-302026-08-15101$1,917None
OSAIC HOLDINGS, INC.2026-06-302026-08-1510,569$200,596None
Schonfeld Strategic Advisors LLC2026-06-302026-08-15562,195$10,670,460None
Squarepoint Ops LLC2026-06-302026-08-15590,200$11,201,996Put
Squarepoint Ops LLC2026-06-302026-08-15230,234$4,369,841None
Man Group plc2026-06-302026-08-1553,054$1,006,965None
Trexquant Investment LP2026-06-302026-08-15333,429$6,328,482None
MetLife Investment Management, LLC2026-06-302026-08-1584,157$1,597,300None
JANE STREET GROUP, LLC2026-06-302026-08-151,679,493$31,876,777None
JANE STREET GROUP, LLC2026-06-302026-08-15519,698$9,863,868None
JANE STREET GROUP, LLC2026-06-302026-08-15131,100$2,488,278Put
JANE STREET GROUP, LLC2026-06-302026-08-1558,300$1,106,534Call
BOOTHBAY FUND MANAGEMENT, LLC2026-06-302026-08-1542,705$810,541None
Legal & General Group Plc2026-06-302026-08-1575,869$1,439,993None
Legal & General Group Plc2026-06-302026-08-1527,114$514,624None
Legal & General Group Plc2026-06-302026-08-1514,023$266,157None

90-day public filing window, up to 50 source positions.

Recent Congressional disclosures

No records are available for this view.

Bounded public source preview, up to 25 disclosed events.

How to read the disclosure dates

The tables report different things: insider transactions, institutional positions and Congressional transaction ranges. Read each table with its source dates and units. They cannot be added into a combined ownership percentage.

  1. Company insiders

    SEC Form 4 purchases, sales and awards report transactions and their public filing availability.

  2. Institutional managers

    13F reports disclose delayed quarter-end positions. They are not a record of trades between quarters.

  3. Congressional filers

    Periodic transaction reports disclose transaction dates and amount brackets. Public filing dates determine what researchers could know.

Read the transaction codes

Awards use transaction code A, purchases P and sales S. An acquisition from an award is not the same as an open-market purchase. Joint filers may share a transaction. Use original receipts and availability dates to interpret the events.