May 22, 2026

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Viant Technology Inc. (NASDAQ: DSP) disclosed that Timothy Vanderhook, its Director, CEO and Chairman, and 10% owner, sold approximately $134,400 worth of company shares, according to a Form 4 filing with the U.S. Securities and Exchange Commission (SEC).
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Viant Technology is an advertising technology company that provides a cloud-based platform for programmatic digital advertising, helping marketers plan, buy, measure, and optimize ad campaigns.
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The reported sales included 5,000 shares sold on May 19 at $10.89 per share, 5,000 shares sold on May 20 at $10.60 per share, and 2,500 shares sold on May 21 at $10.79 per share. After the final reported sale, Vanderhook held 0 shares through the listed indirect ownership vehicle.

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Insider Sale Appears Below Major Signal Thresholds

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This sale is worth noting because it involves Viant’s CEO and Chairman, but the total value of approximately $134K is well below the usual threshold for a stronger insider-selling signal.
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For CEO or CFO selling, transactions above $2.5 million tend to draw greater investor attention. Larger insider sales can prompt investors to review timing, recent stock performance, and the size of the sale relative to remaining holdings.
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In this case, the sale appears smaller and was marked as being made under a Rule 10b5-1 trading plan, which can indicate the transaction was pre-scheduled rather than discretionary.

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Large Insider Sales Require Context

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Unlike insider buying, insider selling can occur for several reasons, including diversification, tax planning, liquidity needs, or pre-arranged trading plans.
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Because this filing shows a 10b5-1 plan indicator and the sale size is below high-signal thresholds, investors should be careful not to overread the transaction as a major negative signal.

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What Investors Watch

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Investors will likely monitor whether additional DSP insiders file sales, whether future transactions continue under the same trading plan, and whether the selling follows a major stock rally or comes near earnings or guidance updates.

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The Bigger Picture: Separating Routine Selling from Signal

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Insider selling is most useful when viewed across size, timing, executive role, and transaction pattern. A single small sale under a trading plan is usually less meaningful than clustered selling across several executives or a large CEO/CFO sale above key thresholds.
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Platforms like LevelFields aggregate insider transactions and flag when activity exceeds key thresholds, helping investors identify when insider buying has historically aligned with meaningful stock movements alongside regulatory events, earnings trends, and buybacks, helping investors identify when leadership transitions have historically led to meaningful stock movements.