MGNI · Insider Trading

Magnite, Inc. Common Stock

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Every open-market purchase and sale reported by MGNI officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.

Form 4 Filings

most recent

Open-Market Buys

code P

Sales

code S

Reporting Insiders

current holders

MGNI — Recent Form 4 Transactions (latest 2026-10-14)

Filed	Insider	Role	Type	Shares	Value
2026-10-14	Paul Caine	Director	Sell	−12,500	−$316.12K
2026-10-02	Haas Sullivan	CHIEF ACCOUNTING OFFICER	A	+24,641	—
2026-10-02	Brian Gephart	CHIEF FINANCIAL OFFICER	A	+64,682	—
2026-09-18	Douglas S Knopper	Director	Sell	−37,337	−$981.22K
2026-09-18	Paul Caine	Director	Sell	−7,500	−$198.75K
2026-09-16	David Buonasera	CHIEF TECHNOLOGY OFFICER	Sell	−1,165	−$27.96K
2026-09-16	Robert F Spillane	Director	MIXED	—	−$192.65K
2026-09-11	Katie Seitz Evans	See Remarks	Sell	−13,997	−$335.93K
2026-09-11	Aaron Saltz	CHIEF LEGAL OFFICER	Sell	−40,000	−$936.40K
2026-09-11	Paul Caine	Director	Sell	−5,000	−$117.65K
2026-09-10	Katie Seitz Evans	See Remarks	MIXED	−29,839	−$953.40K
2026-09-03	David Buonasera	CHIEF TECHNOLOGY OFFICER	Sell	−6,414	−$151.86K
2026-08-28	Sarah Patricia Harden	Director	Sell	−48,986	−$1.15M
2026-08-18	Katie Seitz Evans	See Remarks	F	−11,204	−$277.07K
2026-08-18	David Day	CHIEF FINANCIAL OFFICER	F	−14,170	−$350.42K
2026-08-18	Aaron Saltz	CHIEF LEGAL OFFICER	F	−5,627	−$139.16K
2026-08-18	Sean Patrick Buckley	See Remarks	MIXED	−22,745	−$559.75K
2026-08-18	David Buonasera	CHIEF TECHNOLOGY OFFICER	F	−8,102	−$200.36K
2026-08-18	Paul Caine	Director	Sell	−7,500	−$187.50K
2026-08-18	Brian Gephart	CHIEF ACCOUNTING OFFICER	F	−3,789	−$93.70K
2026-08-18	Michael G. Barrett	CEO	F	−10,404	−$257.29K
2026-08-14	David Day	CHIEF FINANCIAL OFFICER	G	−26,258	—
2026-08-12	Paul Caine	Director	Sell	−5,000	−$121.75K
2026-08-12	Brian Gephart	CHIEF ACCOUNTING OFFICER	Sell	−12,479	−$307.98K
2026-08-12	Rachel Lam	Director	Sell	−10,000	−$241.60K
2026-08-07	David Buonasera	CHIEF TECHNOLOGY OFFICER	Sell	−7,649	−$179.48K
2026-08-07	Sean Patrick Buckley	See Remarks	MIXED	−38,476	−$1.25M
2026-08-07	Katie Seitz Evans	See Remarks	MIXED	—	−$376.80K
2026-08-07	Douglas S Knopper	Director	Sell	−37,337	−$848.30K
2026-08-07	Michael G. Barrett	CEO	MIXED	—	−$4.97M
2026-08-07	Douglas S Knopper	Director	Sell	−37,337	−$848.30K
2026-08-07	David Buonasera	CHIEF TECHNOLOGY OFFICER	Sell	−7,649	−$179.48K
2026-08-07	Katie Seitz Evans	See Remarks	MIXED	—	−$376.80K
2026-08-07	Sean Patrick Buckley	See Remarks	MIXED	−38,476	−$1.25M
2026-08-07	Michael G. Barrett	CEO	MIXED	—	−$4.97M
2026-07-17	Michael G. Barrett	CEO	MIXED	—	−$561.57K
2026-07-14	Paul Caine	Director	Sell	−5,000	−$103.20K
2026-07-09	Sean Patrick Buckley	See Remarks	Sell	−19,233	−$404.47K
2026-07-09	David Buonasera	CHIEF TECHNOLOGY OFFICER	Sell	−1,224	−$25.70K
2026-07-02	David Buonasera	CHIEF TECHNOLOGY OFFICER	Sell	−9,376	−$187.52K
2026-07-01	Michael G. Barrett	CEO	MIXED	—	−$1.03M
2026-06-18	Sean Patrick Buckley	See Remarks	Sell	−19,233	−$365.43K
2026-06-17	Douglas S Knopper	Director	Sell	−37,337	−$675.80K
2026-06-17	David Buonasera	CHIEF TECHNOLOGY OFFICER	Sell	−13,699	−$246.93K
2026-06-17	Michael G. Barrett	CEO	MIXED	—	−$3.10M
2026-06-10	Rachel Lam	Director	A	+13,798	—
2026-06-10	Robert F Spillane	Director	A	+13,798	—
2026-06-10	David T. Pearson	Director	MIXED	+3,032	−$168.49K
2026-06-10	Diane Yu	Director	A	+13,798	—
2026-06-10	Paul Caine	Director	A	+13,798	—

MGNI — Current Insider Holders

Insider	Role	Shares Held	Value
David Day	CHIEF FINANCIAL OFFICER	452,861	$9.79M
Katie Seitz Evans	See Remarks	441,800	$9.55M
Michael G. Barrett	CEO	392,670	$8.49M
Adam Lee Soroca	CHIEF PRODUCT OFFICER	388,425	$8.40M
Sean Patrick Buckley	See Remarks	295,819	$6.40M
David Buonasera	CHIEF TECHNOLOGY OFFICER	245,155	$5.30M
Rachel Lam	Director	230,620	$4.99M
Aaron Saltz	CHIEF LEGAL OFFICER	224,389	$4.85M
Brian Gephart	CHIEF FINANCIAL OFFICER	167,010	$3.61M
Paul Caine	Director	124,901	$2.70M
Sarah Patricia Harden	Director	114,751	$2.48M
James Rossman	Director	107,477	$2.32M
Haas Sullivan	CHIEF ACCOUNTING OFFICER	97,554	$2.11M
David T. Pearson	Director	89,767	$1.94M
Diane Yu	Director	81,279	$1.76M
Robert F Spillane	Director	57,715	$1.25M
Douglas S Knopper	Director	51,136	$1.11M

MGNI Insider Trading FAQ

Who are the insiders at MGNI?

17 officers, directors and 10%+ beneficial owners currently report holdings in MGNI via SEC Form 4.

Are MGNI insiders buying or selling?

Across the 50 most recent Form 4 filings for MGNI, 0 were open-market purchases (code P) and 24 were sales (code S). Sales frequently reflect scheduled 10b5-1 plans or tax withholding rather than a view on the stock.

How current is MGNI insider data?

Form 4 must be filed within two business days of the transaction, so this is close to real time. The most recent MGNI filing is dated 2026-10-14.

How to read Form 4 activity

Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.

Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.

Full filing history and per-insider positions are on the MGNI quote page; the site-wide leaderboard is on the insider transactions hub.