Douglas S. Knopper

Insider · Director · MGNI

Douglas S. Knopper files insider transactions with the SEC as a director of Magnite (MGNI). We hold 3 disclosed purchases and sales filed since 26 January 2006, 2 of them in the last 90 days.

Files forMGNI
Disclosed buys and sells3 in all, 2 in the last 90 days
Last disclosure7 August 2026

Positions held

4 posts we hold — a term names its own dates; a run of filings only says when they filed

Filed 8 July 2020 — 6 August 2026Director · Magnite (MGNI)16 Form 4 lines · source: SEC Form 4
Filed 1 April 2020 — 1 April 2020Director · Rubicon Project (RUBI)1 Form 4 line · source: SEC Form 4
Filed 17 October 2018 — 1 April 2020Director · Telaria (TLRA)9 Form 4 lines · source: SEC Form 4
Filed 25 January 2006 — 2 January 2009Director · Medialink Worldwide (MDLK)4 Form 4 lines · source: SEC Form 4

Everything they disclosed

30 entries, newest first — one per disclosure report, one per Form 4 line

▼ sold on the open market 37,337 shares of MagniteSEC Form 47 August 2026Common Stock · traded 6 August 2026 · filed 7 August 2026
▼ sold on the open market 37,337 shares of MagniteSEC Form 417 June 2026Common Stock · traded 16 June 2026 · filed 17 June 2026
was granted 13,798 shares of MagniteSEC Form 410 June 2026Common Stock · traded 8 June 2026 · filed 10 June 2026
▼ sold on the open market 10,766 shares of MagniteSEC Form 410 June 2026Common Stock · traded 10 June 2026 · filed 10 June 2026
was granted 10,766 shares of MagniteSEC Form 46 June 2025Common Stock · traded 5 June 2025 · filed 6 June 2025
was granted 14,061 shares of MagniteSEC Form 413 June 2024Common Stock · traded 12 June 2024 · filed 13 June 2024
was granted 13,743 shares of MagniteSEC Form 416 June 2023Common Stock · traded 14 June 2023 · filed 16 June 2023
was granted 16,489 shares of MagniteSEC Form 49 June 2022Common Stock · traded 7 June 2022 · filed 9 June 2022
▼ sold on the open market 9,010 shares of MagniteSEC Form 413 July 2021Common Stock · traded 9 July 2021 · filed 13 July 2021
▼ sold on the open market 1,190 shares of MagniteSEC Form 413 July 2021Common Stock · traded 9 July 2021 · filed 13 July 2021
was granted 3,936 shares of MagniteSEC Form 430 June 2021Common Stock · traded 28 June 2021 · filed 30 June 2021
▼ sold on the open market 4,923 shares of MagniteSEC Form 47 April 2021Common Stock · traded 5 April 2021 · filed 7 April 2021
▼ sold on the open market 4,377 shares of MagniteSEC Form 47 April 2021Common Stock · traded 5 April 2021 · filed 7 April 2021
▼ sold on the open market 200 shares of MagniteSEC Form 47 April 2021Common Stock · traded 5 April 2021 · filed 7 April 2021
▼ sold on the open market 500 shares of MagniteSEC Form 47 April 2021Common Stock · traded 5 April 2021 · filed 7 April 2021
was granted 18,436 shares of MagniteSEC Form 416 July 2020Common Stock · traded 8 July 2020 · filed 16 July 2020
returned to the issuer 10,330 shares of Telaria (a derivative holding)SEC Form 43 April 2020Restricted Stock Unit · traded 1 April 2020 · filed 3 April 2020
returned to the issuer 84,757 shares of TelariaSEC Form 43 April 2020Common Stock · traded 1 April 2020 · filed 3 April 2020
was granted 102,884 shares of Rubicon ProjectSEC Form 43 April 2020Common Stock · traded 1 April 2020 · filed 3 April 2020
exercised options over 68,729 shares of Telaria (a derivative holding)SEC Form 417 October 2019Restricted Stock Unit · traded 17 October 2019 · filed 17 October 2019
exercised options over 68,729 shares of TelariaSEC Form 417 October 2019Common Stock · traded 17 October 2019 · filed 17 October 2019
exercised options over 16,028 shares of Telaria (a derivative holding)SEC Form 412 June 2019Restricted Stock Unit · traded 10 June 2019 · filed 12 June 2019
was granted 10,330 shares of Telaria (a derivative holding)SEC Form 412 June 2019Restricted Stock Unit · traded 10 June 2019 · filed 12 June 2019
exercised options over 16,028 shares of TelariaSEC Form 412 June 2019Common Stock · traded 10 June 2019 · filed 12 June 2019
was granted 16,028 shares of Telaria (a derivative holding)SEC Form 419 October 2018Restricted Stock Unit · traded 17 October 2018 · filed 19 October 2018
was granted 68,729 shares of Telaria (a derivative holding)SEC Form 419 October 2018Restricted Stock Unit · traded 17 October 2018 · filed 19 October 2018
was granted 3,000 shares of Medialink Worldwide (a derivative holding)SEC Form 46 January 2009Director Stock Option (Right to Buy) · traded 2 January 2009 · filed 6 January 2009
was granted 3,000 shares of Medialink Worldwide (a derivative holding)SEC Form 43 January 2008Director Stock Option (Right to Buy) · traded 2 January 2008 · filed 3 January 2008
was granted 3,000 shares of Medialink Worldwide (a derivative holding)SEC Form 44 January 2007Director Stock Option (Right to Buy) · traded 2 January 2007 · filed 4 January 2007
was granted 10,000 shares of Medialink Worldwide (a derivative holding)SEC Form 426 January 2006Director Stock Option (Right to Buy) · traded 25 January 2006 · filed 26 January 2006

Positions come from the unitedstates/congress-legislators roster, the Office of Government Ethics and the SEC’s Form 4 index. Every disclosed line names its own source and links the document the government published; we print what the filing says and never a price we did not read from it. Headlines and links come from the GDELT Global Knowledge Graph — the story stays with the publisher. The portrait, where we have one, is the public-domain Congressional Bioguide photograph.