Fund Slashes Magnite Stake by $13 Million as Ad Tech Firm Posts $714 Million Revenue Year | The Motley Fool

"According to a Securities and Exchange Commission (SEC) filing dated February 17, 2026, Granahan Investment Management decreased its position in Magnite by 757,249 shares during the fourth quarter of 2025. The estimated transaction value was $12.57 million, based on the average closing price for the quarter. The quarter-end value of the Magnite stake fell by $33.79 million, which includes both trading activity and price movement effects."

"After the sale, Magnite represents 2.17% of Granahan's $2.34 billion in reportable U.S. equity AUM. Magnite provides an independent sell-side advertising platform, offering applications and services for publishers to manage and monetize digital advertising inventory across CTV, websites, and other digital media properties. The company operates a technology-driven business model, generating revenue primarily through facilitating transactions between digital media sellers and buyers on its platform."

Granahan Investment Management disclosed a reduction in its Magnite position during the fourth quarter of 2025, selling 757,249 shares valued at approximately $12.57 million based on quarterly average pricing. Following this transaction, Magnite represents 2.17% of Granahan's $2.34 billion in reportable U.S. equity assets under management. The quarter-end value of the Magnite stake declined by $33.79 million, reflecting both the trading activity and price movement effects. Magnite operates as an independent sell-side advertising platform, providing technology-driven solutions for publishers to monetize digital advertising inventory across CTV, websites, and other digital media properties. The company serves publishers, advertisers, agencies, and demand-side platforms within the digital advertising ecosystem.

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