FMR LLC and Abigail P. Johnson filed an amended beneficial ownership statement with the SEC on November 4, 2026, disclosing aggregate holdings of 10,873,164.14 shares of Magnite, Inc. common stock, representing 7.6% of the class as of September 30, 2026.

Key Highlights

  • Aggregate beneficial ownership: FMR LLC and Abigail P. Johnson each reported beneficial ownership of 10,873,164.14 shares of Magnite, Inc. common stock.
  • Percentage of class: The aggregate position represents 7.6% of Magnite's outstanding common stock, per the filing.
  • Sole voting power (FMR LLC): FMR LLC reported sole voting power over 10,868,925.00 shares, with zero shared voting power.
  • Sole dispositive power: Both FMR LLC and Abigail P. Johnson each reported sole dispositive power over 10,873,164.14 shares, with no shared dispositive power.
  • Event date: The date of the event requiring this filing was September 30, 2026.
  • Third-party interest noted: The filing states that one or more other persons hold the right to receive dividends or sale proceeds from the common stock, though no single other person's interest exceeds 5% of total outstanding shares.

FMR LLC's Disclosed Position in Magnite's Programmatic Advertising Common Stock

According to the filing, FMR LLC, a Delaware-organized holding company headquartered at 245 Summer Street, Boston, Massachusetts, submitted this amendment on behalf of itself and its direct and indirect subsidiaries. Magnite, Inc., the issuer, is a programmatic advertising technology company whose common stock is listed on NASDAQ:MGNI and is headquartered at 1250 Broadway, 9th Floor, New York, NY 10001, per the filing's issuer address field.

The filing identifies FMR LLC as a parent holding company or control person under Rule 13d-1(b)(1)(ii)(G), and Abigail P. Johnson as an individual reporting person. The two reporting persons are listed separately on the cover pages, each showing identical aggregate beneficial ownership of 10,873,164.14 shares and an identical 7.6% ownership percentage. FMR LLC's sole voting power, however, is reported at the slightly lower figure of 10,868,925.00 shares, while its sole dispositive power matches the full aggregate amount. Both reporting persons report zero shared voting power and zero shared dispositive power.

The filing was signed by Stephanie J. Brown, acting under separate powers of attorney granted by FMR LLC effective January 3, 2023, and by Abigail P. Johnson effective January 26, 2023. The statement certifies, in the filing's own words, that the securities "were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer." An Exhibit 99 identifying relevant subsidiaries is referenced but not reproduced in the filing text provided.

What Was Disclosed

FMR LLC and Abigail P. Johnson disclosed aggregate beneficial ownership of 10,873,164.14 shares of Magnite, Inc. common stock, equal to 7.6% of the class, as of September 30, 2026, through an amended ownership statement filed November 4, 2026.