Brian Gephart was named Chief Financial Officer of Magnite, Inc., effective October 1, 2026. As of November 6, 2026, Magnite, Inc. has reported 3 leadership change filings to the SEC under Item 5.02 of Form 8-K, from April 10, 2026 to September 21, 2026, naming 2 appointments (Form 8-K, September 21, 2026).
MAGNITE, INC. named a new Chief Financial Officer on Sep 21. 30 companies changed executives this week.
Companies that just changed executives, and the new executive. Before you unlock: the company, the change and what is inside. After: the executive named with their role, how to reach the company, and a person's email only when we found one.
| John Hancock Comvest Private Income Fund | named a new Chief Financial Officer | |
| Bain Capital Specialty Finance, Inc. | named a new Director | |
| Azora Therapeutics, Inc. (DE) | named a new Director | |
| LASE Corp. | named a new Director | |
| Century Communities, Inc. | named a new Executive Chairman |
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Key facts
- · In / out: In · Person: Brian Gephart · Role: Chief Financial Officer · Effective: 2026-10-01 · 8-K, 2026-09-21
- · In / out: Reported · Person: not named in the filing · 8-K, 2026-04-20
- · In / out: Reported · Person: not named in the filing · 8-K, 2026-04-10
Magnite, Inc. reported changes in 3 filings among its directors and officers to the SEC on Form 8-K, Item 5.02, from 2026-04-10 to 2026-09-21. They name 2 people. Every row below is cited to the filing it comes from, and this page adds each new change as Magnite, Inc. files it.
Also on the record for Magnite, Inc.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| November 5, 2026 | Stake report, Schedule 13G/A, by FMR LLC | 7.6% of the class | 5%+ stakes | Source |
| August 13, 2026 | Stake report, Schedule 13G/A, by Wellington Management Group LLP | 4.2% of the class | 5%+ stakes | Source |
| August 6, 2026 | Stake report, Schedule 13G, by FMR LLC | 5.4% of the class | 5%+ stakes | Source |
| May 14, 2026 | Stake report, Schedule 13G/A, by Capital Research Global Investors | 3.5% of the class | 5%+ stakes | Source |
| May 6, 2026 | Stake report, Schedule 13G/A, by FMR LLC | 3.1% of the class | 5%+ stakes | Source |
| April 30, 2026 | Stake report, Schedule 13G, by Vanguard Capital Management | 5.04% of the class | 5%+ stakes | Source |
| April 29, 2026 | Stake report, Schedule 13G, by Vanguard Portfolio Management | 5.43% of the class | 5%+ stakes | Source |
| March 27, 2026 | Stake report, Schedule 13G/A, by The Vanguard Group | — | 5%+ stakes | Source |
| February 12, 2026 | Stake report, Schedule 13G, by Capital Research Global Investors | 9% of the class | 5%+ stakes | Source |
| February 10, 2026 | Stake report, Schedule 13G, by Wellington Management Group LLP | 6% of the class | 5%+ stakes | Source |
| December 5, 2025 | Stake report, Schedule 13G/A, by FMR LLC | 5.7% of the class | 5%+ stakes | Source |
| November 13, 2025 | Stake report, Schedule 13G/A, by Capital Research Global Investors | 4.9% of the class | 5%+ stakes | Source |
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More on Magnite, Inc. and the records around it.
Magnite, Inc. elsewhere on the record
- 5%+ stake filings Nov 2026
- Who owns it
Companies that share a holder
- Capital Research Global Investors also filed stake reports on 99 other companies: Royal Caribbean Cruises Ltd. (Oct 2026), Patria Investments Ltd. (Sep 2026), Arxis, Inc. (Aug 2026)
- Wellington Management Group LLP also filed stake reports on 240 other companies: Hub Group, Inc. (Oct 2026), Latham Group, Inc. (Oct 2026), Redwood Trust, Inc. (Oct 2026)
- FMR LLC also filed stake reports on 761 other companies: ASPEN NEUROSCIENCE INC (Nov 2026), AVALO THERAPEUTICS INC (Nov 2026), BRAZE INC (Nov 2026)
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The newest 12 of 14 records.
Timeline
| Filed | In / out | Person | Role | Effective | Source |
|---|---|---|---|---|---|
| 2026-09-21 | In | Chief Financial Officer | 2026-10-01 | 8-K, 2026-09-21 | |
| 2026-09-21 | In | Chief Accounting Officer | 2026-10-01 | 8-K, 2026-09-21 | |
| 2026-04-20 | Reported | not named in the filing | 8-K, 2026-04-20 | ||
| 2026-04-10 | Reported | not named in the filing | 8-K, 2026-04-10 |
Who leads Magnite, Inc., as last reported?
For each role that changed in the filings below, the most recent change reported. A role that did not change in these filings is not listed.
- Chief Accounting Officer: Haas Sullivan, appointed, effective 2026-10-01 (filed 2026-09-21).
- Chief Financial Officer: Brian Gephart, appointed, effective 2026-10-01 (filed 2026-09-21).
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Find candidates like Chief Financial Officer at Magnite, Inc.Every change, in the filing's words
Appointed: Brian Gephart, Chief Financial Officer, effective 2026-10-01
On September 18, 2026, Magnite, Inc. (the "Company") appointed Brian Gephart as the Company's Chief Financial Officer ("CFO"), effective October 1, 2026, in which capacity he will serve as principal financial officer.
Appointed: Haas Sullivan, Chief Accounting Officer, effective 2026-10-01
On September 18, 2026, the Company appointed Haas Sullivan as the Company's Chief Accounting Officer ("CAO"), effective October 1, 2026, in which capacity he will serve as principal accounting officer.
- Mr. Gephart, age 47, has served as the Company's Chief Accounting Officer since June 2021.
- Prior to joining the Company, Mr. Gephart served as the Chief Financial Officer and principal financial officer of Leaf Group, a diversified consumer internet company that builds enduring, creator-driven brands that reach passionate audiences in large and growing lifestyle categories, since May 2020, and as Chief Accounting Officer and principal accounting officer from June 2019 to May 2020.
- Prior to joining Leaf Group, Mr. Gephart served as Chief Accounting Officer of JH Capital Group, a diversified specialty finance company providing a wide array of solutions for consumers and businesses across a broad range of assets, from August 2017 to April 2019.
- Prior to joining JH Capital Group, Mr. Gephart was a Director at PricewaterhouseCoopers LLP specializing in Capital Markets & Accounting Advisory Services, from July 2011 to August 2017, where he advised a variety of private and public companies on capital market transactions, mergers and acquisitions and financial reporting and accounting matters.
- Mr. Gephart received a bachelor's degree in Accounting from Hillsdale College and an M.B.A. from DePaul University.
Reported
On April 20, 2026, Magnite, Inc. (the "Company") announced that David Day plans to retire as the Company's Chief Financial Officer.
- Mr. Day entered into a transition agreement pursuant to which he will continue to serve as CFO until September 30, 2026.
- After such date, it is expected that he will remain employed as a non-executive advisor through May 31, 2027 to assist with an orderly transition.
Reported
On April 7, 2026, Magnite, Inc. (the "Company") announced that Adam Soroca would cease serving as the Company's Chief Product Officer, effective April 8, 2026.
- Mr. Soroca will remain employed with the Company as an advisor through May 15, 2026.
- In connection with his termination of employment, Mr. Soroca will be entitled to severance benefits in accordance with the terms of the Executive Severance and Vesting Acceleration Agreement, between the Company and Mr. Soroca, as further described in the Company's Proxy Statement for the 2025 Annual Meeting of Stockholders, filed with the SEC on April 16, 2025.
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Where this comes from
A public company must file a current report on Form 8-K with the SEC within four business days when a director leaves or is elected, or when its chief executive, chief financial, chief accounting or chief operating officer, or another named executive, departs or is appointed. That disclosure goes under Item 5.02 of the report.
Every change on this page is taken from one of those filings and quoted in the company's own words, with a link to the filing, so it can be checked at the source. Where a filing names the person, the role and the date a change takes effect, they are shown beside the quote. Where it does not, the quote stands on its own. A filing states what changed; it rarely states why, and neither does this page.