Skip to main content

Magnite, Inc.

MGNI
Exchange
Nasdaq
Industry
Services-Computer Programming, Data Processing, Etc.
SEC CIK
0001595974

In the last 90 days, Magnite, Inc. insiders filed 0 open-market purchases and 26 sales; 311 institutions reported holding it in 13F filings for Q2 2026, worth $2.69B in total; no superinvestor holds it.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by Magnite, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
0 filings
Open-market sells
26 filings
11 insiders, $19.1M in total
Insiders trading
11
Net value
−$19.1M
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Magnite, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for Magnite, Inc.
NameTitleLast reported holdingLast filingFilings, past year
Caine PaulDirector137,401Sep 18, 20267
Knopper Douglas SDirector51,136Sep 18, 20264
Buonasera DavidCHIEF TECHNOLOGY OFFICER245,155Sep 16, 202613
Spillane Robert FDirector57,715Sep 16, 20264
Evans Katie SeitzSee Remarks441,800Sep 11, 20269
Saltz AaronCHIEF LEGAL OFFICER224,389Sep 11, 20267
Harden Sarah PatriciaDirector114,751Aug 28, 20262
Gephart BrianCHIEF ACCOUNTING OFFICER102,328Aug 18, 20266
Barrett Michael G.CEO392,670Aug 18, 202610
Day DavidCHIEF FINANCIAL OFFICER452,861Aug 18, 20267
Buckley Sean PatrickSee Remarks293,060Aug 18, 202610
Lam RachelDirector230,620Aug 12, 20262
Rossman JamesDirector107,477Jun 10, 20261
Pearson David T.Director79,001Jun 10, 20261
Yu DianeDirector81,279Jun 10, 20261
Soroca Adam LeeCHIEF PRODUCT OFFICER388,425Feb 18, 20265
Frankenberg Robert JDirector119,090Jun 16, 20230
Troe Lisa LDirector114,218Jun 12, 20230
Dove James AllenChief Technology Officer191,071Aug 17, 20220
Prusz Joseph RChief Revenue Officer, DV+311,083Feb 16, 20220

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Sep 18, 2026 (view filing)4:06 PM ETSep 171 dayCaine PaulDirectorSSale−7.50K$26.50−$198.8K−5.2%137.4K after10b5-1
Sep 18, 2026 (view filing)4:05 PM ETSep 171 dayKnopper Douglas SDirectorSSale−37.3K$26.28−$981.2K−42.2%51.1K after10b5-1
Sep 16, 2026 (view filing)4:23 PM ETSep 142 daysBuonasera DavidCHIEF TECHNOLOGY OFFICERSSale−1.17K$24.00−$28.0K−0.5%245.2K after10b5-1
Sep 16, 2026 (view filing)4:20 PM ETSep 142 daysSpillane Robert FDirectorSSale−10.4K$23.76−$246.2K−15.2%57.7K after
Sep 11, 2026 (view filing)4:19 PM ETSep 11Same dayEvans Katie SeitzSee RemarksSSale−14.0K$24.00−$335.9K−3.1%441.8K after10b5-1
Sep 11, 2026 (view filing)4:15 PM ETSep 101 daySaltz AaronCHIEF LEGAL OFFICERSSale−40.0K$23.41−$936.4K−15.1%224.4K after10b5-1
Sep 11, 2026 (view filing)4:11 PM ETSep 101 dayCaine PaulDirectorSSale−5.00K$23.53−$117.7K−3.3%144.9K after10b5-1
Sep 10, 2026 (view filing)4:39 PM ETSep 8-92 daysEvans Katie SeitzSee RemarksSSale−43.4K$23.59−$1.02M−8.7%455.8K after2 lots10b5-1
Sep 3, 2026 (view filing)4:56 PM ETSep 1-22 daysBuonasera DavidCHIEF TECHNOLOGY OFFICERSSale−6.41K$23.68−$151.9K−2.5%246.3K after2 lots10b5-1
Aug 28, 2026 (view filing)6:36 PM ETAug 26-282 daysHarden Sarah PatriciaDirectorSSale−49.0K$23.57−$1.15M−29.9%114.8K after2 lots10b5-1
Aug 18, 2026 (view filing)4:16 PM ETAug 144 daysCaine PaulDirectorSSale−7.50K$25.00−$187.5K−4.8%149.9K after10b5-1
Aug 18, 2026 (view filing)4:14 PM ETAug 17-181 dayBuckley Sean PatrickSee RemarksSSale−11.0K$24.48−$270.0K−3.6%293.1K after2 lots10b5-1
Aug 12, 2026 (view filing)4:54 PM ETAug 102 daysGephart BrianCHIEF ACCOUNTING OFFICERSSale−12.5K$24.68−$308.0K−10.5%106.1K after
Aug 12, 2026 (view filing)4:51 PM ETAug 102 daysLam RachelDirectorSSale−10.0K$24.16−$241.6K−4.2%230.6K after
Aug 12, 2026 (view filing)4:49 PM ETAug 102 daysCaine PaulDirectorSSale−5.00K$24.35−$121.8K−3.1%157.4K after10b5-1
Aug 7, 2026 (view filing)5:14 PM ETAug 61 dayBuckley Sean PatrickSee RemarksSSale−67.2K$24.49−$1.65M−17.5%315.8K after2 lots10b5-1
Aug 7, 2026 (view filing)5:10 PM ETAug 61 dayKnopper Douglas SDirectorSSale−37.3K$22.72−$848.3K−29.7%88.5K after10b5-1
Aug 7, 2026 (view filing)5:09 PM ETAug 61 dayBuonasera DavidCHIEF TECHNOLOGY OFFICERSSale−7.65K$23.46−$179.5K−2.8%260.8K after3 lots10b5-1
Aug 7, 2026 (view filing)5:06 PM ETAug 61 dayEvans Katie SeitzSee RemarksSSale−20.0K$24.00−$480.0K−3.9%496.8K after10b5-1
Aug 7, 2026 (view filing)5:00 PM ETAug 61 dayBarrett Michael G.CEOSSale−294.0K$22.72−$6.68M−42.2%403.1K after10b5-1
Jul 17, 2026 (view filing)5:00 PM ETJul 152 daysBarrett Michael G.CEOSSale−38.6K$20.35−$785.4K−8.7%403.1K after10b5-1
Jul 14, 2026 (view filing)5:50 PM ETJul 104 daysCaine PaulDirectorSSale−5.00K$20.64−$103.2K−3.0%162.4K after10b5-1
Jul 9, 2026 (view filing)4:32 PM ETJul 72 daysBuonasera DavidCHIEF TECHNOLOGY OFFICERSSale−1.22K$21.00−$25.7K−0.5%268.5K after10b5-1
Jul 9, 2026 (view filing)4:27 PM ETJul 72 daysBuckley Sean PatrickSee RemarksSSale−19.2K$21.03−$404.5K−5.1%354.3K after10b5-1
Jul 2, 2026 (view filing)7:07 PM ETJul 11 dayBuonasera DavidCHIEF TECHNOLOGY OFFICERSSale−9.38K$20.00−$187.5K−3.4%269.7K after10b5-1
Jul 1, 2026 (view filing)4:49 PM ETJun 292 daysBarrett Michael G.CEOSSale−75.0K$19.50−$1.46M−15.7%403.1K after10b5-1
Jun 18, 2026 (view filing)Jun 171 dayBuckley Sean PatrickSee RemarksSSale−19.2K$19.00−$365.4K−4.9%373.5K after10b5-1
Jun 17, 2026 (view filing)Jun 161 dayKnopper Douglas SDirectorSSale−37.3K$18.10−$675.8K−22.9%125.8K after10b5-1
Jun 17, 2026 (view filing)Jun 15-172 daysBuonasera DavidCHIEF TECHNOLOGY OFFICERSSale−13.7K$18.03−$246.9K−4.7%279.1K after3 lots10b5-1
Jun 17, 2026 (view filing)Jun 15-162 daysBarrett Michael G.CEOSSale−278.6K$16.92−$4.71M−40.9%403.1K after2 lots10b5-1
Jun 10, 2026 (view filing)Jun 10Same dayKnopper Douglas SDirectorSSale−10.8K$15.73−$169.3K−6.2%163.1K after10b5-1
Jun 10, 2026 (view filing)Jun 10Same dayPearson David T.DirectorSSale−10.8K$15.65−$168.5K−12.0%79.0K after10b5-1
Jun 3, 2026 (view filing)Jun 12 daysBuonasera DavidCHIEF TECHNOLOGY OFFICERSSale−1.41K$15.00−$21.1K−0.5%292.8K after10b5-1
May 21, 2026 (view filing)May 192 daysSpillane Robert FDirectorSSale−10.0K$13.33−$133.3K−18.5%43.9K after
Feb 18, 2026 (view filing)Feb 18Same daySoroca Adam LeeCHIEF PRODUCT OFFICERSSale−21.5K$12.00−$258.3K−5.3%388.4K after10b5-1
Dec 19, 2025 (view filing)Dec 172 daysSoroca Adam LeeCHIEF PRODUCT OFFICERSSale−16.7K$17.00−$283.2K−4.9%326.1K after10b5-1
Nov 26, 2025 (view filing)Nov 242 daysBuckley Sean PatrickPresident, RevenueSSale−2.21K$14.50−$32.1K−0.8%268.9K after10b5-1
Nov 21, 2025 (view filing)Nov 21Same daySpillane Robert FDirectorSSale−12.5K$14.22−$177.8K−18.8%53.9K after
Nov 18, 2025 (view filing)Nov 18Same dayBuckley Sean PatrickPresident, RevenueSSale−4.43K$13.36−$59.1K−1.6%271.1K after10b5-1
Nov 18, 2025 (view filing)Nov 18Same daySoroca Adam LeeCHIEF PRODUCT OFFICERSSale−10.9K$13.23−$143.6K−3.2%326.1K after10b5-1
Oct 28, 2025 (view filing)Oct 244 daysCaine PaulDirectorSSale−5.00K$20.00−$100.0K−3.2%153.6K after10b5-1
Sep 19, 2025 (view filing)Sep 19Same daySaltz AaronCHIEF LEGAL OFFICERSSale−8.52K$24.50−$208.8K−3.8%215.1K after10b5-1
Sep 19, 2025 (view filing)Sep 19Same dayCaine PaulDirectorSSale−7.50K$25.00−$187.5K−4.5%158.6K after10b5-1
Sep 17, 2025 (view filing)Sep 152 daysSaltz AaronCHIEF LEGAL OFFICERSSale−6.18K$23.94−$147.9K−2.7%223.6K after10b5-1
Sep 12, 2025 (view filing)Sep 102 daysCaine PaulDirectorSSale−5.00K$23.60−$118.0K−2.9%166.1K after2 lots10b5-1
Sep 10, 2025 (view filing)Sep 8-92 daysBuckley Sean PatrickPresident, RevenueSSale−40.0K$25.09−$1.00M−12.2%287.2K after2 lots
Sep 5, 2025 (view filing)Sep 41 dayGephart BrianCHIEF ACCOUNTING OFFICERSSale−27.7K$24.71−$683.8K−23.0%92.9K after10b5-1
Sep 4, 2025 (view filing)Sep 31 dayBuonasera DavidCHIEF TECHNOLOGY OFFICERSSale−2.95K$25.37−$74.8K−1.2%238.6K after10b5-1
Sep 4, 2025 (view filing)Sep 22 daysSoroca Adam LeeCHIEF PRODUCT OFFICERSSale−25.0K$24.69−$616.9K−6.7%346.4K after2 lots10b5-1
Aug 29, 2025 (view filing)Aug 29Same daySaltz AaronCHIEF LEGAL OFFICERSSale−12.4K$26.07−$323.3K−5.1%229.8K after