Dropbox Co-Founder's Trust Files to Sell $13.3M in Stock
DBX sits 62% above its 52-week low of $21.695.
Summary
Andrew Houston's revocable trust filed to sell 383,800 Dropbox shares (~$13.3M) under a pre-existing 10b5-1 plan—the largest insider sale notice in the past 90 days.
Key Events · Ownership and Investor Activity · DBX
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Houston Trust Files $13.3M Sale Notice
Andrew Houston Revocable Trust filed Form 144 to sell 383,800 shares (~$13.28M) under a 10b5-1 plan adopted 06/11/2026.
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Largest Insider Sale in 90 Days
This is the largest Form 144 in the 90-day window, exceeding prior officer sales of $384K–$540K, and the first from Houston's trust.
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Founder Shares Being Sold
The shares were acquired as founders shares on 06/25/2007, making this a monetization of original equity.
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Near 52-Week High
The sale notice comes with the stock at $35.05, near its 52-week high of $36.37, and days after a disclosed security breach affecting ~5,000 accounts.
Analysis · DBX · Technology
A notable distribution signal emerges as Andrew Houston's revocable trust—which holds his founder shares—filed to sell 383,800 shares worth about $13.3 million under a 10b5-1 plan adopted June 11, 2026. This is the largest insider sale notice in the 90-day window and the first from Houston's trust, which is also a 10% stockholder. The sale comes as the stock trades near its 52-week high and just days after Dropbox disclosed a security breach affecting roughly 5,000 accounts. While the 10b5-1 plan was adopted before the breach disclosure, the size and the identity of the seller make this a notable distribution signal.
How filings like this one have moved
In the 30 days to Sep 10, 2026, 30% of the 1963 measured filings Wiseek scored 7 moved their stock by 5% or more by the next session's close. The median move was -0.14%. 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, DBX was trading at $35.05 on NASDAQ in the Technology sector, with a market capitalization of approximately $7.6B. The 52-week trading range was $21.70 to $36.37. This filing was assessed with negative market sentiment and an importance score of 7 out of 10.