What to Know When a Magnite Director Sells Into a 36% Growth Quarter
Key Points
The disposition of 37,337 shares generated a total transaction value of $848,000 on August 6.
This sale represents 30% of the director's previous direct common stock holdings in the company, based on holdings disclosed in the Form 4.
The transaction was executed under a Rule 10b5-1 trading plan adopted on December 12, 2025.
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Douglas S. Knopper, a director at Magnite, Inc. (NASDAQ:MGNI), sold 37,337 shares of common stock on August 6 at $22.72 per share, according to an SEC Form 4 filing.
Transaction summary
| Metric | Value |
|---|---|
| Transaction value | $848,000 |
| Shares sold | 37,337 |
| Post-transaction shares (directly held) | 88,473 |
| Post-transaction value | $2.15 million |
Transaction value based on SEC Form 4 weighted average sale price ($22.72); post-transaction value based on the August 6 market close ($24.32).
Key questions
- What was the catalyst for this transaction?
The sale was pre-arranged under a Rule 10b5-1 trading plan established in December 2025, a mechanism frequently used by corporate insiders to execute trades according to predetermined parameters to avoid potential conflicts. - What is the extent of the insider's remaining exposure?
Following this transaction, Knopper retains direct ownership of 88,473 shares, representing a 0.06% insider interest in the company. - What financial context surrounds the company?
Magnite operates in the communication services sector as an advertising agency platform provider, with a market capitalization of $3.5 billion and trailing-twelve-month revenue of $742.0 million as of the August 6 market close. - How has the stock performed leading up to this filing?
As of the transaction date, the company has delivered an 8% one-year total return, while reporting trailing-12-month net income of $166.9 million.
Company Overview
| Metric | Value |
|---|---|
| Share Price (as of market close 2026-08-06) | $24.32 |
| Market Capitalization | $3.5 billion |
| Revenue (TTM) | $742.0 million |
| Net Income (TTM) | $166.9 million |
Company Snapshot
- Magnite operates a global digital advertising marketplace platform that provides publishers—including connected TV channels, mobile applications, and websites—with comprehensive tools and applications to manage and monetize their advertising inventory.
- The company generates revenue through a two-sided marketplace model, offering services and technology solutions to both supply-side participants (publishers) and demand-side participants (advertisers, agencies, agency trading desks, and demand-side platforms), facilitating programmatic advertising transactions.
- Magnite's primary customers include digital publishers seeking to optimize ad revenue, advertising agencies and brands requiring efficient media buying solutions, and demand-side platforms that leverage the company's infrastructure to execute targeted advertising campaigns at scale.
Magnite is a leading independent platform in the digital advertising technology sector, with a market capitalization of $3.5 billion and TTM revenues of $742.0 million. The company maintains a competitive advantage through its sophisticated, independent marketplace infrastructure that connects a diverse ecosystem of publishers and advertisers globally. With a demonstrated ability to generate substantial net income of $166.9 million TTM, Magnite is positioned as a critical infrastructure provider in the programmatic advertising landscape.
What this transaction means for investors
Unlike executives who cashed in options on the same day, Knopper simply sold shares he already held, under a plan set back in December. Still, a director trimming a stake on a preset schedule is about the quietest signal in the insider-filing world, and he kept 88,473 shares.
What all five sales have in common is the strong quarter they followed. Connected TV, the piece of Magnite that matters most, grew contribution ex-TAC 36% to $97 million and now makes up more than half the total, while adjusted EBITDA rose 30%. Management raised full-year guidance across its main measures on the strength of that momentum.
Five insiders selling in one day sounds like a stampede until you notice every sale ran on a plan set months earlier. There are a number of other things long-term investors should focus on instead: The firm is positioning its new agentic products as a "great future tailwind," and it's now projecting higher adjusted EBITDA, stronger margins, and greater free cash flow. The upcoming quarters will show just how those projections hold up, but so far, shares are rallying post-earnings.
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Jonathan Ponciano has no position in any of the stocks mentioned. The Motley Fool recommends Magnite. The Motley Fool has a disclosure policy.
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