As of November 7, 2026, Magnite, Inc. is a publicly traded company (Nasdaq: MGNI); its largest reported holder is Fidelity (FMR), with 7.6% on Schedule 13G/A of November 5, 2026, then Vanguard (5.43%). The largest insider holding is David Day, the chief financial officer, with 452,861 shares (0.32% of shares outstanding), per Form 4 of August 18, 2026 (Schedule 13G/A, November 5, 2026).
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Is Magnite, Inc. a real, registered company?
- Magnite Inc files with the SEC under CIK 1595974 (its SEC filings).
- Its shares are listed under the ticker MGNI on Nasdaq (SEC company record).
- Incorporated in Delaware; business address in New York, New York, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under MAGNITE INC in our court records and SEC 8-K records (as of 2026-11-07).
- Leadership changes: the latest reported is Brian Gephart, Chief Financial Officer (Form 8-K filed 2026-09-21). Check you are dealing with the people now in charge.
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names Fidelity (FMR) (filed 2026-11-05).
Who are Magnite, Inc.'s owners and officers?
Magnite, Inc.: incorporated in Delaware; business address in New York, New York; industry Services-Computer Programming, Data Processing, Etc. (Schedule 13G/A, 2026-11-05).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-11-05 | Fmr LLC | 7.6% |
| Schedule 13G/A, 2026-08-13 | Wellington Management Group LLP | 4.2% |
| Schedule 13G, 2026-08-06 | Fmr LLC | 5.4% |
| Schedule 13G/A, 2026-05-14 | Capital Research Global Investors | 3.5% |
| Schedule 13G/A, 2026-05-06 | Fmr LLC | 3.1% |
| Schedule 13G, 2026-04-30 | Vanguard Capital Management | 5.04% |
| Schedule 13G, 2026-04-29 | Vanguard Portfolio Management | 5.43% |
| Schedule 13G/A, 2026-03-27 | The Vanguard Group | 0% |
| Schedule 13G, 2026-02-12 | Capital Research Global Investors | 9% |
| Schedule 13G, 2026-02-10 | Wellington Management Group LLP | 6% |
| Schedule 13G/A, 2025-12-05 | Fmr LLC | 5.7% |
| Schedule 13G/A, 2025-11-13 | Capital Research Global Investors | 4.9% |
Questions about who owns Magnite, Inc.
Who owns Magnite, Inc.?
On this page, 3 holders' latest ownership filings report 5% or more of Magnite, Inc.: Fmr LLC (7.6%, Schedule 13G/A, filed 2026-11-05), Vanguard Portfolio Management (5.43%, Schedule 13G, filed 2026-04-29) and Vanguard Capital Management (5.04%, Schedule 13G, filed 2026-04-30).
Who are the largest shareholders of Magnite, Inc.?
By the share each holder's latest filing reports, the largest holders of Magnite, Inc. on this page are Fmr LLC (7.6%), Vanguard Portfolio Management (5.43%) and Vanguard Capital Management (5.04%).
When did Fmr LLC buy into Magnite, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Fmr LLC on this page is the Schedule 13G/A, filed 2025-12-05, reporting 5.7%; its latest, Schedule 13G/A filed 2026-11-05, reports 7.6%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 12 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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What the Full Report on Magnite, Inc. covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
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| Filed | Person | Role | Change | Effective |
|---|---|---|---|---|
| Form 8-K, 2026-09-21 | Brian Gephart | Chief Financial Officer | appointed | 2026-10-01 |
| Form 8-K, 2026-09-21 | Haas Sullivan | Chief Accounting Officer | appointed | 2026-10-01 |
Which insiders own Magnite, Inc. shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- , the chief financial officer: 452,861 shares (0.32% of shares outstanding) (Form 4, 2026-08-18).
- Evans Katie Seitz: 441,800 shares (0.31% of shares outstanding) (Form 4, 2026-09-11).
- , the chief executive and a director: 392,670 shares (0.27% of shares outstanding) (Form 4, 2026-08-18).
- , the chief product officer: 388,425 shares (0.27% of shares outstanding) (Form 4, 2026-02-18).
- Buckley Sean Patrick: 282,069 shares (0.20% of shares outstanding) (Form 4, 2026-11-06).
Shares outstanding: 143,559,468 as of 2026-10-28, from the company's latest SEC cover page.
How much has Magnite, Inc. raised?
No fundraising or offering filing from Magnite, Inc. is on file with us.
Keep reading
More on Magnite, Inc. and the records around it.
Magnite, Inc. elsewhere on the record
- 5%+ stake filings Nov 2026
- Leadership changes Sep 2026
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)
Related pages
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