Magnite, Inc.
A maker of software that automates the buying and selling of digital ad space, Magnite runs one of the world's largest marketplaces for connected TV advertising, with tools like SpringServe and ClearLine serving publishers and advertisers. Born from the 2020 merger of Rubicon Project and Telaria, it took its name from the mineral magnetite, a nod to the way its platform magnetically draws together buyers and sellers. Its roots trace to 2007, when Rubicon Project's founders set out to build an automated stock exchange for ad impressions.
Granted 46.9K
Sold 849.8K
Sold 525.1K
Granted 637.3K · Sold 264.2K
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Granted 4.55M · Bought 100.0K · Sold 2.51M
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| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Mandal SumantDirector · 27 transactions | — | 7.28Mas of Feb 2019 | 46.9K | — | — |
| News Corp10% owner · 6 transactions | — | 5.60Mas of Apr 2014 | — | — | 849.8K |
| Clearstone Venture Partners III-A LP10% owner · 1 transaction | — | 5.57Mas of May 2015 | — | — | — |
| Beck James T +6 co-filersSee Explanation of Responses, 10% owner · 3 transactions | — | 4.11Mas of Apr 2014 | — | — | — |
| Clearstone Venture Partners III-A LP +2 co-filers10% owner · 12 transactions | — | 4.01Mas of Oct 2015 | — | — | — |
| Beck James T +6 co-filersSee Explanation of Responses, 10% owner · 12 transactions | — | 3.59Mas of Mar 2015 | — | — | 525.1K |
| Raifman Gregory RDirector · 26 transactions | — | 1.25Mas of May 2017 | 637.3K | — | 264.2K |
| Addante FrankDirector · 67 transactions | — | 1.14Mas of Mar 2020 | 782.0K | — | 1.50M |
| Mohn JarlDirector · 8 transactions | — | 833.0Kas of Apr 2014 | 21.3K | — | 50.0K |
| Barrett Michael G.CEO, Director · 80 transactions | — | 503.1K | 4.55M | 100.0K | 2.51M |
| Evans Katie SeitzPresident, Operations · 63 transactions | — | 496.8K | 750.7K | — | 530.6K |
| Day DavidCHIEF FINANCIAL OFFICER · 122 transactions | — | 493.3K | 1.97M | — | 1.06M |
| Kershaw ThomasChief Technology Officer · 40 transactions | — | 473.8Kas of May 2021 | 1.13M | — | 496.8K |
| Tappin Todd LCFO & COO · 27 transactions | — | 441.3Kas of May 2016 | 668.4K | — | 344.8K |
| Soroca Adam LeeCHIEF PRODUCT OFFICER · 90 transactions | — | 388.4K | 1.17M | — | 510.7K |
| Buckley Sean PatrickSee Remarks · 47 transactions | — | 373.5K | 829.7K | — | 249.1K |
| Zagorski MarkPresident & COO · 2 transactions | — | 348.9Kas of Apr 2020 | 436.9K | — | — |
| Prusz Joseph RChief Revenue Officer, DV+ · 24 transactions | — | 311.1Kas of Feb 2022 | 445.9K | — | 157.5K |
| Buonasera DavidCHIEF TECHNOLOGY OFFICER · 37 transactions | — | 279.1K | 304.1K | — | 103.7K |
| Copple Brian WGeneral Counsel and Secretary · 17 transactions | — | 277.5Kas of May 2018 | 336.8K | — | 8.9K |
| Saltz AaronCHIEF LEGAL OFFICER · 73 transactions | — | 270.0K | 754.4K | — | 302.1K |
| Lam RachelDirector · 14 transactions | — | 240.6K | 258.9K | 7.5K | 20.0K |
| Filip EveSee remarks · 14 transactions | — | 213.2Kas of Jul 2020 | 183.1K | — | 29.3K |
| Dove James AllenChief Technology Officer · 6 transactions | — | 191.1Kas of Aug 2022 | 206.1K | — | — |
| Hughes ShawnaChief Accounting Officer · 5 transactions | — | 178.1Kas of May 2021 | 83.0K | — | 7.0K |
| Caine PaulDirector · 30 transactions | — | 167.4K | 277.4K | — | 110.0K |
| Harden Sarah PatriciaDirector · 9 transactions | — | 163.7K | 163.7K | — | — |
| Tuller BlimaChief Accounting Officer · 16 transactions | — | 143.1Kas of May 2020 | 213.6K | — | 49.0K |
| Knopper Douglas SDirector · 16 transactions | — | 125.8K | 194.1K | — | 68.3K |
| Frankenberg Robert JDirector · 13 transactions | — | 119.1Kas of Jun 2023 | 119.1K | — | — |
| Gephart BrianCHIEF ACCOUNTING OFFICER · 28 transactions | — | 118.6K | 224.4K | — | 66.1K |
| Troe Lisa LDirector · 17 transactions | — | 114.2Kas of Jun 2023 | 125.1K | — | 10.9K |
| Rossman JamesDirector · 16 transactions | — | 107.5K | 419.4K | — | 311.9K |
| Patz Harry JrChief Revenue Officer · 1 transaction | — | 100.0Kas of Jan 2017 | — | — | 891 |
| Yu DianeDirector · 7 transactions | — | 81.3K | 101.3K | — | 20.0K |
| Feldman JonathanCo-General Counsel & Secretary · 10 transactions | — | 79.8Kas of Jan 2020 | 61.0K | — | 93.4K |
| Clearstone Venture Partners III-B, a Delaware Multiple Series LLC +1 co-filer10% owner · 4 transactions | — | 79.7Kas of Jul 2015 | — | — | — |
| Pearson David T.Director · 8 transactions | — | 79.0K | 101.3K | — | 22.3K |
| Spillane Robert FDirector · 22 transactions | — | 57.7K | 157.7K | — | 100.0K |
| Coleman Lewis WDirector · 6 transactions | — | 55.7Kas of May 2019 | 55.7K | — | — |
Select a row to see that insider’s individual transactions. Sum of the holdings confirmed in the 12 months before this insider's last filing. A Form 4 reports a holding per line — held directly, or through a named trust, partnership or foundation, and in each share class separately — never a person’s total. Lines not restated in that time are left out and shown apart: an active filer restates what they still hold, so a line they did not restate is more often an entity since renamed, whose shares a successor line reports too. An amber marker means some were left out.
Net open-market activity over all recorded history: -10.27M shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.