Ambiq Micro Officer/Director Fumihide Esaka Files to Sell $3.17M in Stock
AMBQ has more than doubled off its 52-week low of $22.12.
Summary
Officer and director Fumihide Esaka filed a Form 144 to sell 50,000 shares of Ambiq Micro stock worth about $3.17 million, continuing a pattern of insider selling.
Key Events · Ownership and Investor Activity · AMBQ
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Officer/Director Files to Sell $3.17M
Fumihide Esaka filed a Form 144 to sell 50,000 shares with an approximate market value of $3,167,995.
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Shares Acquired via Option Exercise
The 50,000 shares were acquired on September 11, 2026, through the exercise of options under a registered plan, indicating a cash-out of newly vested equity.
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Insider Selling Pattern Continues
This filing follows $11.6 million in open-market insider sales over the past 90 days, including a $2.01 million Form 144 by the same insider on August 31, 2026.
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Recent Sales History
Esaka sold 122,000 shares for approximately $7.04 million in the past three months, according to the filing's Table II.
Analysis · AMBQ · Manufacturing
Fumihide Esaka, an officer and director, has filed a Form 144 to sell 50,000 shares worth approximately $3.17 million. This follows a pattern of insider selling at Ambiq Micro, with $11.6 million in open-market sales by insiders over the past 90 days. The proposed sale is larger than the $2.01 million Form 144 filed by the same insider on August 31, 2026, and the shares were acquired today via option exercise, indicating a cash-out of newly vested equity. While the company's fundamentals have improved recently, the sustained insider distribution is a notable overhang.
How filings like this one have moved
In the 30 days to Sep 12, 2026, 29.9% of the 1939 measured filings Wiseek scored 7 moved their stock by 5% or more by the next session's close. The median move was -0.15%. 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 $63.52 on NYSE in the Manufacturing sector, with a market capitalization of approximately $1.5B. The 52-week trading range was $22.12 to $91.61. This filing was assessed with negative market sentiment and an importance score of 7 out of 10.