Founder Eric Lefkofsky Files to Sell 200,000 Shares (~$14M) as Insider Sales Accelerate
TEM sits 96% above its 52-week low of $40.77 on elevated volume (2.6× avg).
Summary
Founder Eric Lefkofsky filed to sell 200,000 shares (~$14M), adding to $33.8M in sales by his affiliated entities over the past three months.
Key Events · Ownership and Investor Activity · TEM
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Founder Files to Sell 200,000 Shares
Eric Lefkofsky filed a Form 144 to sell 200,000 shares worth approximately $13.99 million on NASDAQ, with a proposed sale date of September 17, 2026.
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Affiliated Entities Sold $33.8M in 3 Months
Blue Media, Gray Media, Lefkofsky Family Foundation, and Vas.org Foundation sold 616,250 shares for $33.76 million between June 29 and August 25, 2026.
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10b5-1 Plan Adopted March 8, 2026
The sale is executed under a pre-arranged 10b5-1 trading plan adopted March 8, 2026, indicating the disposition was scheduled in advance.
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Follows Prior 144 Filing on August 25
This filing comes three weeks after Lefkofsky filed a Form 144 on August 25, 2026 to sell 250,000 shares worth approximately $16.5 million.
Analysis · TEM · Technology
Tempus AI founder and 10% owner Eric Lefkofsky has filed to sell another 200,000 shares worth approximately $14 million, just three weeks after a prior Form 144 for 250,000 shares. The filing also reveals that Lefkofsky's affiliated entities — Blue Media, Gray Media, Lefkofsky Family Foundation, and Vas.org Foundation — have already sold 616,250 shares for $33.8 million in the past three months. This is a sustained, large-scale insider liquidation by the company's founder and largest shareholder, executed under a 10b5-1 plan adopted March 8, 2026. While pre-planned sales are less alarming than discretionary selling, the sheer volume and frequency — over $47 million in combined proposed and recent sales — creates meaningful overhang and signals reduced founder skin-in-the-game during a period when Tempus is integrating its $1.5 billion Personalis acquisition.
How filings like this one have moved
In the 30 days to Sep 30, 2026, 34.9% of the 1020 measured filings Wiseek scored 8 moved their stock by 5% or more by the next session's close. The median move was -0.54%. These are measured outcomes after filings of this importance, not a forecast for this one.
Measured one observation per ticker per day, after exclusions. Current figures: Filing Impact Tracker · open dataset
At the time of this filing, TEM was trading at $79.83 on NASDAQ in the Technology sector, with a market capitalization of approximately $14.5B. The 52-week trading range was $40.77 to $104.32. This filing was assessed with negative market sentiment and an importance score of 8 out of 10.