Magnite, Inc. Common Stock (MGNI)

About Magnite, Inc. Common Stock

Magnite is a supply-side advertising platform that provides technology and yield management solutions to content publishers, enabling them to monetize their digital advertising inventory. Magnite receives a percentage of all advertising inventory that it sells. 43% of Magnite's revenue is derived from connected television, or CTV, streaming platforms, 40% from mobile applications, and the remainder from general websites. Beyond the typical monetization responsibilities inherent to an SSP, Magnite also provides upstream advertising servers to CTV publishers, allowing them to have granular control over direct-sold, programmatic guaranteed, and open-auction logic. Magnite competes with other independent SSPs, supply path optimization solutions, and closed ecosystems like Meta.

Institutional ownership

In 13F filings for the quarter ended June 30, 2026, 297 institutions reported holding MGNI, with 141.1 million shares worth $2.7 billion in aggregate. The largest reported holder was Vanguard, with 15.6 million shares worth $296.9 million. Of the 5 largest holders listed below, 4 added shares and 1 reduced its position during the quarter.

Form 13F is a quarterly report that institutional investment managers with at least $100 million in qualifying securities file with the SEC. It lists long positions as of the last day of the quarter and is due within 45 days of quarter end, so these holdings describe that date rather than today.

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