Magnite Ownership & Insider Activity

Magnite (MGNI) institutional and insider ownership, recent insider transactions and ownership breakdown.

Insiders own 5.4% of shares outstanding. Institutional investors hold 59.7%. Over the past 90 days, insiders made 15 sales worth $6.6M.

Shares Outstanding

143.215M

Shares Float

126.762M

Insider Shares Owned

7.738M

Insider % Owned

5.4%

Institutional Shares Held

85.611M

Institutional % Held

59.7%

Ownership Breakdown

Net Insider Activity by Month

Purchases (90d)

Sales (90d)

$6.6M total

Net Activity

Net Selling

Net Value (90d)

-$6.6M

Magnite Insider Transactions (Last 6 Months)

See all insider trades →

Date	Insider	Title	Type	Shares	Price	Value
Oct 12, 2026	Paul Caine	DIRECTOR	SELL	12.500K	$25.29	$316K
Sep 17, 2026	Paul Caine	DIRECTOR	SELL	7.500K	$26.50	$199K
Sep 17, 2026	Douglas Knopper	DIRECTOR	SELL	37.337K	$26.28	$981K
Sep 14, 2026	David Buonasera	CHIEF TECHNOLOGY OFFICER	SELL	1.165K	$24.00	$28K
Sep 14, 2026	Robert Spillane	DIRECTOR	SELL-OPTIONS	—	$14.46	$193K
Sep 11, 2026	Seitz Katie Evans	SEE REMARKS	SELL	13.997K	$24.00	$336K
Sep 10, 2026	Aaron Saltz	CHIEF LEGAL OFFICER	SELL	40.000K	$23.41	$936K
Sep 10, 2026	Paul Caine	DIRECTOR	SELL	5.000K	$23.53	$118K
Sep 8, 2026	Seitz Katie Evans	SEE REMARKS	SELL	29.839K	$14.37	$953K
Sep 1, 2026	David Buonasera	CHIEF TECHNOLOGY OFFICER	SELL	6.414K	$23.68	$152K
Aug 26, 2026	Patricia Sarah Harden	DIRECTOR	SELL	48.986K	$23.57	$1.2M
Aug 15, 2026	Patrick Sean Buckley	SEE REMARKS	SELL	22.745K	$24.61	$560K
Aug 14, 2026	Paul Caine	DIRECTOR	SELL	7.500K	$25.00	$188K
Aug 10, 2026	Brian Gephart	CHIEF ACCOUNTING OFFICER	SELL	12.479K	$24.68	$308K
Aug 10, 2026	Rachel Lam	DIRECTOR	SELL	10.000K	$24.16	$242K
Aug 10, 2026	Paul Caine	DIRECTOR	SELL	5.000K	$24.35	$122K
Aug 6, 2026	Patrick Sean Buckley	SEE REMARKS	SELL	38.476K	$19.20	$1.2M
Aug 6, 2026	Douglas Knopper	DIRECTOR	SELL	37.337K	$22.72	$848K
Aug 6, 2026	David Buonasera	CHIEF TECHNOLOGY OFFICER	SELL	7.649K	$23.46	$179K
Aug 6, 2026	Seitz Katie Evans	SEE REMARKS	SELL-OPTIONS	—	$14.58	$377K
Aug 6, 2026	MICHAEL BARRETT	CEO	SELL-OPTIONS	—	$14.26	$5.0M
Jul 15, 2026	MICHAEL BARRETT	CEO	SELL-OPTIONS	—	$13.08	$562K
Jul 10, 2026	Paul Caine	—	SELL	5.000K	$20.64	$103K
Jul 7, 2026	David Buonasera	CHIEF TECHNOLOGY OFFICER	SELL	1.224K	$21.00	$26K
Jul 7, 2026	Patrick Sean Buckley	SEE REMARKS	SELL	19.233K	$21.03	$404K
Jul 1, 2026	David Buonasera	CHIEF TECHNOLOGY OFFICER	SELL	9.376K	$20.00	$188K
Jun 29, 2026	MICHAEL BARRETT	CEO	SELL-OPTIONS	—	$12.65	$1.0M
Jun 17, 2026	Patrick Sean Buckley	SEE REMARKS	SELL	19.233K	$19.00	$365K
Jun 16, 2026	Douglas Knopper	—	SELL	37.337K	$18.10	$676K
Jun 15, 2026	David Buonasera	CHIEF TECHNOLOGY OFFICER	SELL	13.699K	$18.03	$247K
Jun 15, 2026	MICHAEL BARRETT	CEO	SELL-OPTIONS	—	$11.36	$3.1M
Jun 8, 2026	Douglas Knopper	—	GRANT	3.032K	$15.73	$169K
Jun 8, 2026	DAVID PEARSON	—	GRANT	3.032K	$15.65	$168K
Jun 1, 2026	David Buonasera	CHIEF TECHNOLOGY OFFICER	SELL	1.409K	$15.00	$21K
May 19, 2026	Robert Spillane	—	SELL	10.000K	$13.33	$133K

Magnite Inc

Magnite Ownership & Insider Activity

Magnite Insider Transactions (Last 6 Months)

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