Ambiq Micro President & COO Sells $3.9M in Stock After Option Exercise
AMBQ has more than doubled off its 52-week low of $22.12 on elevated volume (2.1× avg).
Summary
Ambiq Micro's President and COO, Sean Chihhsiang Chen, sold $3.9 million worth of common stock on the open market after exercising options, following a recent pattern of insider sales.
Key Events · Ownership and Investor Activity · AMBQ
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Executive Stock Sale
President and COO Sean Chihhsiang Chen sold 55,685 shares of common stock for a total value of $3,947,280.94 on May 15, 2026.
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Option Exercise Preceded Sale
The sale followed the exercise of options for 55,685 shares at a strike price of $5.88, valued at $327,427.80.
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Insider Distribution Trend
This transaction adds to a broader trend of insider selling at Ambiq Micro, with net insider sales exceeding $4.9 million in the last 90 days.
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Timing Near 52-Week Highs
The sale occurred while the company's stock is trading near its 52-week high of $73.72, potentially indicating profit-taking by the executive.
Analysis · AMBQ · Manufacturing
This Form 4 filing reports a significant open market sale by Ambiq Micro's President and COO, Sean Chihhsiang Chen, totaling nearly $4 million. The sale occurred after exercising options and contributes to a pattern of insider distribution, with over $4.9 million in net insider sales over the last 90 days. While the company recently reported strong financial results and the stock is trading near its 52-week high, a substantial sale by a key executive can be interpreted as a lack of conviction in further upside or a move to lock in gains.
How filings like this one have moved
In the 30 days to Oct 22, 2026, 36.9% of the 1029 measured filings Wiseek scored 8 moved their stock by 5% or more by the next session's close. The median move was -0.77%. 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, AMBQ was trading at $71.34 on NYSE in the Manufacturing sector, with a market capitalization of approximately $1.5B. The 52-week trading range was $22.12 to $73.72. This filing was assessed with negative market sentiment and an importance score of 8 out of 10.