SCHEDULE: FMR LLC and Abigail P. Johnson Disclose 12.2% Stake in Magnite Inc.

FMR LLC and its Chairman and CEO, Abigail P. Johnson, have disclosed a combined beneficial ownership of 12.2% of Magnite Inc.'s common stock as of June 30, 2025.

Summary

• FMR LLC, a Delaware-organized entity, and Abigail P. Johnson, a U.S. citizen, jointly reported beneficial ownership of 17,224,291.22 shares of Magnite Inc. common stock.
• This aggregate amount represents 12.2% of Magnite Inc.'s outstanding common stock.
• FMR LLC holds sole voting power over 17,218,530.30 shares and sole dispositive power over 17,224,291.22 shares.
• Abigail P. Johnson holds sole dispositive power over 17,224,291.22 shares, with no sole or shared voting power directly.
• The filing is an Amendment No. 1 to a Schedule 13G, indicating a change in previously reported beneficial ownership.
• FMR LLC is classified as a parent holding company or control person, and Abigail P. Johnson is identified as an individual.
• Several FMR LLC subsidiaries and affiliates are identified as entities that beneficially own shares, including FIAM LLC, Fidelity Institutional Asset Management Trust Company, Fidelity Management & Research Company LLC (which beneficially owns 5% or greater), Fidelity Management Trust Company, and Strategic Advisers LLC.
• Abigail P. Johnson is a Director, Chairman, and Chief Executive Officer of FMR LLC, and members of the Johnson family are the predominant owners of FMR LLC's Series B voting common shares, representing 49% of the voting power.

Sentiment

Score: 7

Explanation: The filing is primarily informational, disclosing a significant institutional ownership stake. The presence of a large, reputable institutional investor like FMR LLC holding a substantial stake is generally viewed as a positive signal of confidence in the company.

Positives

• The disclosure of a significant 12.2% stake by a major institutional investor like FMR LLC can be interpreted as a vote of confidence in Magnite Inc.'s long-term prospects and business strategy.
• The continued holding of a substantial stake by FMR LLC suggests a stable and committed institutional shareholder base for Magnite Inc.

Future Outlook

The document does not provide any forward-looking statements or guidance regarding Magnite Inc.'s future performance or strategic direction.

Management Comments

• "By signing below I certify that, to the best of my knowledge and belief, the securities referred to above 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 of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under §§ 240.14a-11."

Industry Context

FMR LLC is a prominent global asset management firm. Magnite Inc. operates in the digital advertising technology (ad tech) sector, providing a sell-side advertising platform. FMR LLC's significant stake indicates its investment interest in the ad tech industry and Magnite's position within it.

Stakeholder Impact

• Shareholders: The disclosure of a significant institutional stake can influence investor perception and potentially impact share price, signaling confidence from a major asset manager.

Key Dates

Keywords

Magnite Inc., FMR LLC, Abigail P. Johnson, Beneficial Ownership, Schedule 13G, Common Stock, Institutional Investor, Ad Tech, Equity Stake