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AI brief of an SEC Form 8-K · MAGNITE, INC. (MGNI)

Magnite names Brian Gephart CFO effective Oct. 1, succeeding retiring David Day

Neutral Impact 4 of 5 leadership Written later

Magnite appointed Brian Gephart as Chief Financial Officer effective October 1, 2026, succeeding David Day, who announced his retirement. Gephart has been the company's Chief Accounting Officer since June 2021, and the company also named Haas Sullivan as Chief Accounting Officer effective the same date. The filing describes leadership succession and compensation terms, not financial results.

Key points

  • Brian Gephart, age 47, becomes CFO effective October 1, 2026, succeeding retiring CFO David Day
  • Gephart's equity award totals $2.25 million: $1,575,000 in RSUs granted October 1, 2026 and $675,000 in PSUs expected in 2027
  • Haas Sullivan, age 43, becomes Chief Accounting Officer effective October 1, 2026, with an RSU grant of approximately $600,000

The filing

CompanyMAGNITE, INC. (MGNI)
Form8-K, current report
Filed with the SECSep 21, 2026, 5:05 PM ET
Accession number0001595974-26-000032

Items reported: 5.02 Director / Officer Change

Read the filing on SEC.gov ↗

Written by AI on Nov 9, 2026, 8:38 AM ET, from this filing only. Written later: this filing was briefed after the fact, when past filings were added to the site, so the brief may be read with hindsight; the filing itself is the record of what was known on September 21, 2026.

Briefs are written by AI from the filing text and can contain mistakes — open the filing before acting on anything. Impact (1-5) and tone are the AI's reading of the filing for shareholders, not a price forecast. Not investment advice.