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MGNI insider trading — Magnite, Inc.

Over the last 90 days, insiders at Magnite, Inc. (MGNI) made 0 open-market purchases worth $0 and 3 open-market sales worth $796K, making them net sellers by $796K. The largest sale was by Gephart Brian (CHIEF ACCOUNTING OFFICER), who sold 12,479 shares for $308K on Aug 10, 2026.

Updated Oct 16, 2026.

Insider buying · 90d
$0
Insider selling · 90d
$796K
Net · 90d
−$796K
Last 30 days
0B / 1S

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Recent MGNI insider transactions

Every Form 4 filed by Magnite, Inc. officers, directors and 10% owners in the last 90 days, newest first. P = open-market purchase, S = open-market sale; other codes are awards, option exercises, tax withholding or gifts.

Trade dateInsiderRoleTypeOwnershipSharesPriceValueFiling
Oct 12, 2026Caine PaulDirectorS · Sale · 10b5-1Direct12,500$25.29$316KForm 4
Oct 1, 2026Sullivan HaasCHIEF ACCOUNTING OFFICERA · Grant/awardDirect24,641——Form 4
Oct 1, 2026Gephart BrianCHIEF FINANCIAL OFFICERA · Grant/awardDirect64,682——Form 4
Sep 17, 2026Caine PaulDirectorS · Sale · 10b5-1Direct7,500$26.50$199KForm 4
Sep 17, 2026Knopper Douglas SDirectorS · Sale · 10b5-1Direct37,337$26.28$981KForm 4
Sep 14, 2026Buonasera DavidCHIEF TECHNOLOGY OFFICERS · Sale · 10b5-1Direct1,165$24.00$28KForm 4
Sep 14, 2026Spillane Robert FDirectorM · Option exerciseDirect10,363$5.17$54KForm 4
Sep 14, 2026Spillane Robert FDirectorS · SaleDirect10,363$23.76$246KForm 4
Sep 11, 2026Evans Katie SeitzSee RemarksS · Sale · 10b5-1Direct13,997$24.00$336KForm 4
Sep 10, 2026Saltz AaronCHIEF LEGAL OFFICERS · Sale · 10b5-1Direct40,000$23.41$936KForm 4
Sep 10, 2026Caine PaulDirectorS · Sale · 10b5-1Direct5,000$23.53$118KForm 4
Sep 9, 2026Evans Katie SeitzSee RemarksS · Sale · 10b5-1Direct11,100$23.46$260KForm 4
Sep 8, 2026Evans Katie SeitzSee RemarksM · Option exercise · 10b5-1Direct13,546$5.16$70KForm 4
Sep 8, 2026Evans Katie SeitzSee RemarksS · Sale · 10b5-1Direct32,285$23.63$763KForm 4
Sep 2, 2026Buonasera DavidCHIEF TECHNOLOGY OFFICERS · Sale · 10b5-1Direct1,043$25.00$26KForm 4
Sep 1, 2026Buonasera DavidCHIEF TECHNOLOGY OFFICERS · Sale · 10b5-1Direct5,371$23.42$126KForm 4
Aug 28, 2026Harden Sarah PatriciaDirectorS · Sale · 10b5-1Direct18,436$24.00$442KForm 4
Aug 26, 2026Harden Sarah PatriciaDirectorS · Sale · 10b5-1Direct30,550$23.31$712KForm 4
Aug 15, 2026Buonasera DavidCHIEF TECHNOLOGY OFFICERF · Tax withholdingDirect8,102$24.73$200KForm 4
Aug 15, 2026Evans Katie SeitzSee RemarksF · Tax withholdingDirect11,204$24.73$277KForm 4
Aug 15, 2026Saltz AaronCHIEF LEGAL OFFICERF · Tax withholdingDirect5,627$24.73$139KForm 4
Aug 15, 2026Gephart BrianCHIEF ACCOUNTING OFFICERF · Tax withholdingDirect3,789$24.73$94KForm 4
Aug 15, 2026Barrett Michael G.CEOF · Tax withholdingDirect10,404$24.73$257KForm 4
Aug 15, 2026Day DavidCHIEF FINANCIAL OFFICERF · Tax withholdingDirect14,170$24.73$350KForm 4
Aug 14, 2026Caine PaulDirectorS · Sale · 10b5-1Direct7,500$25.00$188KForm 4
Aug 18, 2026Buckley Sean PatrickSee RemarksS · Sale · 10b5-1Direct2,759$25.00$69KForm 4
Aug 17, 2026Buckley Sean PatrickSee RemarksS · Sale · 10b5-1Direct8,271$24.31$201KForm 4
Aug 15, 2026Buckley Sean PatrickSee RemarksF · Tax withholding · 10b5-1Direct11,715$24.73$290KForm 4
Aug 13, 2026Day DavidCHIEF FINANCIAL OFFICERG · GiftDirect26,258——Form 4
Aug 10, 2026Gephart BrianCHIEF ACCOUNTING OFFICERS · SaleDirect12,479$24.68$308KForm 4
Aug 10, 2026Lam RachelDirectorS · SaleDirect10,000$24.16$242KForm 4
Aug 10, 2026Caine PaulDirectorS · Sale · 10b5-1Direct5,000$24.35$122KForm 4
Aug 6, 2026Buckley Sean PatrickSee RemarksM · Option exercise · 10b5-1Direct28,703$13.90$399KForm 4
Aug 6, 2026Buckley Sean PatrickSee RemarksS · Sale · 10b5-1Direct67,179$24.49$1.65MForm 4
Aug 6, 2026Knopper Douglas SDirectorS · Sale · 10b5-1Direct37,337$22.72$848KForm 4
Aug 6, 2026Buonasera DavidCHIEF TECHNOLOGY OFFICERS · Sale · 10b5-1Direct7,649$23.46$179KForm 4
Aug 6, 2026Evans Katie SeitzSee RemarksM · Option exercise · 10b5-1Direct20,000$5.16$103KForm 4
Aug 6, 2026Evans Katie SeitzSee RemarksS · Sale · 10b5-1Direct20,000$24.00$480KForm 4
Aug 6, 2026Barrett Michael G.CEOM · Option exercise · 10b5-1Direct293,968$5.80$1.71MForm 4
Aug 6, 2026Barrett Michael G.CEOS · Sale · 10b5-1Direct293,968$22.72$6.68MForm 4

MGNI insider trading FAQ

Are insiders buying MGNI stock?

Not on the open market. In the last 90 days, Magnite, Inc. insiders made no open-market purchases, and 3 open-market sales totaling $796K. Purchases with the insider's own money are generally seen as a stronger signal than sales, which happen for many reasons (taxes, diversification, planned 10b5-1 sales).

Who are the insiders trading MGNI?

Recent sellers: Gephart Brian, Lam Rachel, Spillane Robert F.

Where does MGNI insider trading data come from?

Every transaction comes from SEC Form 4 filings on EDGAR. Company officers, directors and 10% owners must file a Form 4 within two business days of buying or selling. InsiderBolt reads these filings directly from the SEC.

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Insider trading data is for informational purposes only and is not investment advice. Filings can be amended; always confirm details on SEC EDGAR.