Ambiq Micro, Inc. Form 4 Filings

Ambiq Micro, Inc. (AMBQ) director Ker Zhang exercised a stock option on September 4, 2026, converting rights for 1,785 shares of common stock at an exercise price of $5.88 per share. On the same date, Zhang sold 185 shares of common stock at $56.92 per share. The option covered by this transaction was fully exercised and reported as having no remaining balance, and no Rule 10b5-1 trading plan is reported.

Ambiq Micro, Inc. (AMBQ) reports that Chief Executive Officer and director Fumihide Esaka exercised stock options covering 117,771 shares of common stock at exercise prices of $8.12 and $12.60 per share between August 31 and September 2, 2026. Over the same period, he sold 108,500 shares of common stock in a series of open-market transactions at weighted-average prices reported between $55.45 and $58.74 per share. The filing states these transactions occurred under a Rule 10b5-1 trading plan adopted on May 15, 2026.

Ambiq Micro, Inc. (AMBQ) reported insider transactions by Chief Technology Officer Hanson Scott McLean involving option exercises and share sales on August 26–27, 2026. McLean exercised stock options for a total of 65,000 shares of common stock at an exercise price of $8.12 per share, then sold 55,000 shares of common stock in open-market transactions at weighted average prices ranging from about $59.58 to $60.32 per share, according to footnote price ranges. The sales were executed in multiple trades within specified price ranges, and no post-transaction share holdings are reported in this filing.

Ambiq Micro, Inc. (AMBQ) reported that Chief Technology Officer Hanson Scott McLean exercised stock options for 7,000 shares of common stock at an exercise price of $8.12 per share and then sold 7,000 shares of common stock in three open-market transactions on August 14, 2026, at weighted average prices of $63.2562, $64.4061, and $65.3013 per share. Following the option exercise, McLean held 62,279 stock options directly. All transactions occurred under a Rule 10b5-1 trading plan adopted on May 15, 2026.

Ambiq Micro, Inc. (AMBQ) reported that Chief Executive Officer Fumihide Esaka exercised stock options for 13,500 shares of common stock at an exercise price of $8.12 per share and on the same date sold 13,500 shares in multiple open-market transactions at weighted average prices between approximately $62.66 and $65.56 per share. After the option exercise, Esaka held 85,507 stock options directly. All transactions occurred on August 14, 2026 under a Rule 10b5-1 plan adopted on May 15, 2026.

Ambiq Micro, Inc. director HSIEH Wen Hsuan reported an equity award and updated holdings. The filing shows a grant of 4,957 restricted stock units, each representing one share of common stock, which will vest in three equal annual installments tied to continued board service. The director also reports indirect ownership of 633,920 common shares through Matter Venture Partners Fund I, L.P., over which he exercises sole voting and dispositive control.

Chen Timothy reported acquisition or exercise transactions in this Form 4 filing.

Ambiq Micro, Inc. director Timothy Chen reported a grant of 4,957 restricted stock units, each representing one share of common stock. These RSUs vest in three equal annual installments based on either grant anniversaries or upcoming annual stockholder meetings, subject to his continuous service, bringing his direct holdings to 52,575 shares.

Banks Bernard Bennett reported acquisition or exercise transactions in this Form 4 filing.

Ambiq Micro, Inc. director Bernard Bennett Banks received an equity grant in the form of restricted stock units. The award covers 4,957 shares of common stock at no purchase price and represents a compensation-related grant rather than an open-market transaction.

The RSUs vest in three equal annual installments after the grant date. Each installment vests on the earlier of the first, second, and third anniversaries of the grant date or the company’s corresponding first three annual stockholder meetings, subject to the director’s continuous service under Ambiq Micro’s 2025 Equity Incentive Plan.

TAUTGES JOSEPH A reported acquisition or exercise transactions in this Form 4 filing.

Ambiq Micro, Inc. director Joseph A. Tautges received an equity award in the form of 4,957 restricted stock units, each representing one share of common stock. The RSUs vest in three equal annual installments tied to future anniversaries of the grant date or annual stockholder meetings, subject to his continuous service under the company’s 2025 Equity Incentive Plan. Following this grant, he directly holds 53,703 shares of Ambiq Micro common stock.

ZHANG KER reported acquisition or exercise transactions in this Form 4 filing.

Ambiq Micro, Inc. director Ker Zhang received a grant of 4,957 restricted stock units, representing a right to receive the same number of common shares at no cost. These RSUs vest in three equal annual installments tied to future anniversaries or annual stockholder meetings, subject to his continued board service under the company’s 2025 Equity Incentive Plan. Following this equity award, Zhang holds 28,766 shares of common stock directly.

Ambiq Micro, Inc. Chief Financial Officer Jeffrey G. Winzeler exercised stock options to acquire 5,952 shares of common stock at $16.80 per share on June 2, 2026. After the transaction, he directly owned 106,299 common shares and retained a substantial remaining stock option position.

The exercised options were part of a larger grant where 47,619 shares vested on October 1, 2025, with an additional portion vesting on June 2, 2026 and the rest vesting in equal monthly installments, subject to his continued service. The exercised option grant is scheduled to expire on June 9, 2035.

Ambiq Micro, Inc. director Timothy Chen reported a series of open-market sales of the company’s common stock on May 27, 2026. In total, an entity named Triumph Way Investment Inc., over which Chen exercises sole voting and dispositive control, sold 70,592 shares at weighted-average prices ranging from about $78 to $82 per share.

Following these transactions, Chen continues to hold 47,618 Ambiq Micro shares directly, according to the filing. The sales were executed in multiple trades at different prices within specified ranges, with full price details available on request from the company or the SEC staff.

Ambiq Micro director-associated entity converts preferred stock into common shares. An entity linked to director Timothy Chen, Triumph Way Investment Inc., converted shares of Series F-1 Convertible Preferred Stock into 70,592 shares of Common Stock on July 31, 2025, immediately before Ambiq Micro’s initial public offering. Following the automatic conversion, Chen holds these shares indirectly and exercises sole voting and dispositive control over them, while the Series F-1 Convertible Preferred Stock position is reduced to zero.

Ambiq Micro, Inc. Chief Financial Officer Jeffrey G. Winzeler exercised stock options to acquire 31,952 shares of common stock at $16.80 per share on May 14 and 15, 2026. On May 14, 2026, he sold 26,000 shares in open-market transactions at prices around $69.8981–$70.65 per share, based on a weighted average. After these moves, he directly holds 100,347 shares of common stock and 110,905 stock options, with certain options vesting over time and expiring on June 9, 2035.

Ambiq Micro Chief Technology Officer Hanson Scott McLean reported a mix of option exercises and share sales. On May 14, he exercised stock options at $8.12 per share for 10,200 shares of common stock, then sold a total of 10,200 common shares in several open-market trades at weighted average prices between $68.6234 and $70.50 per share. On May 15, he exercised additional options for 8,100 shares at the same $8.12 exercise price. Following these transactions, he directly holds 211,226 shares of common stock and 69,279 stock options, with the reported option grant vesting monthly after an initial vesting on August 16, 2019 and expiring on October 1, 2028.

Ambiq Micro President and COO Sean Chihhsiang Chen reported an exercise-and-sell transaction in company stock. On May 15, 2026, he exercised stock options for 55,685 shares of Common Stock at $5.88 per share and sold an equal number of shares in open-market trades.

The sales were split into 23,334 shares at a weighted average price of $71.3746 and 32,351 shares at a weighted average price of $70.5334, executed across multiple transactions within disclosed price ranges. After these transactions, Chen directly held 120,275 shares of Ambiq Micro common stock, indicating he retains a substantial equity position following the option exercise and related sales.

Ambiq Micro Chief Executive Officer Esaka Fumihide reported option exercises and a stock sale. On May 14, 2026, he exercised options to acquire 60,000 shares of common stock at $8.12 per share and sold 60,000 shares in an open‑market transaction at a weighted average price of $70.0187 per share.

On May 15, 2026, he reported additional option exercises that increased his direct holdings without same‑day sales, including exercises at $12.60 per share. Following these transactions, he directly held 451,189 shares of Ambiq Micro common stock, while continuing to hold multiple stock option positions with stated vesting schedules and expirations.

Ambiq Micro, Inc. General Counsel Michele Kim Connors reported routine share dispositions tied to tax withholding. On April 2, 2026, she disposed of a total of 811 shares of Common Stock in transactions used to satisfy her tax withholding obligations upon vesting and settlement of previously reported restricted stock units.

The reported weighted average prices were $26.0385 for 660 shares and $26.6509 for 151 shares, executed across multiple trades within disclosed price ranges. After these transactions, she continued to hold 60,554 shares of Ambiq Micro common stock directly, indicating that the dispositions represented a small portion of her overall holdings and were mechanically driven by tax requirements rather than discretionary open‑market selling.

Ambiq Micro, Inc. Chief Financial Officer Jeffrey G. Winzeler received a grant of 41,728 shares of Common Stock in the form of restricted stock units at no cash cost. Each RSU converts into one share of common stock when it vests.

According to the award terms, 25% of the RSUs will vest on October 1, 2027, and the remaining units will vest in equal quarterly installments thereafter, contingent on his continued service under the company’s 2025 Equity Incentive Plan. Following this grant, Winzeler directly holds 94,395 shares of Ambiq Micro common stock.

Chen Sean Chihhsiang reported acquisition or exercise transactions in this Form 4 filing.

Ambiq Micro, Inc. reported that President and COO Sean Chihhsiang Chen received an equity grant of 64,246 shares of common stock in the form of restricted stock units. These RSUs were granted at no cash purchase price and increase his direct holdings to 120,275 shares after the award.

Each RSU represents a contingent right to receive one share of Ambiq Micro common stock upon settlement. According to the vesting schedule, 25% of the RSUs will vest on October 1, 2027, and the remaining shares will vest in equal quarterly installments over the following three years, as long as Chen maintains continuous service under the company’s 2025 Equity Incentive Plan.

Hanson Scott McLean reported acquisition or exercise transactions in this Form 4 filing.

Ambiq Micro Chief Technology Officer Hanson Scott McLean received a grant of 80,308 shares of common stock in the form of restricted stock units (RSUs). The award was recorded at a price of $0.00 per share as equity compensation, not a market purchase. Following this grant, he directly holds 203,126 shares of Ambiq Micro common stock. According to the award terms, 25% of the RSUs will vest on October 1, 2027, and the remaining shares will vest in equal quarterly installments over three years, contingent on his continued service under the company’s 2025 Equity Incentive Plan.

Ambiq Micro, Inc.’s Chief Executive Officer, Esaka Fumihide, received a grant of 160,616 shares of common stock in the form of restricted stock units. The award carries no cash exercise price and is part of equity compensation, not an open-market purchase.

According to the terms, 25% of the RSUs will vest on October 1, 2027, and the remaining 75% will vest in equal quarterly installments of 1/12 thereafter, so long as he maintains Continuous Service under Ambiq’s 2025 Equity Incentive Plan. Following this grant, he directly holds 391,189 shares of common stock.

Connors Michele Kim reported acquisition or exercise transactions in this Form 4 filing.

Ambiq Micro, Inc. reported that its General Counsel, Michele Kim Connors, received a grant of 32,123 shares of Common Stock in the form of restricted stock units (RSUs) at no cash cost. Following this equity award, she holds 61,365 shares directly.

Each RSU represents a right to receive one share of Common Stock upon settlement. According to the vesting schedule, 25% of the RSUs will vest on October 1, 2027, with the remaining RSUs vesting in equal quarterly installments over three years, contingent on her continued service under the company’s 2025 Equity Incentive Plan.

Connors Michele Kim reported acquisition or exercise transactions in this Form 4 filing.

Ambiq Micro, Inc. General Counsel Michele Kim Connors received a grant of 32,123 shares of common stock in the form of restricted stock units. Following this award, she holds 61,365 common shares directly. Each RSU represents the right to receive one share upon settlement.

According to the grant terms, 25% of the RSUs will vest on September 1, 2027, and the remaining units will vest in quarterly installments of 1/12 thereafter, conditioned on her continued service under the company’s 2025 Equity Incentive Plan.

Winzeler Jeffrey G reported acquisition or exercise transactions in this Form 4 filing.

Ambiq Micro, Inc. reported that Chief Financial Officer Jeffrey G. Winzeler received an equity grant in the form of 41,728 restricted stock units (RSUs) of common stock. The award has no cash purchase price and is part of his compensation rather than an open-market transaction.

Each RSU represents a right to receive one share of common stock upon settlement. According to the vesting schedule, 25% of the units will vest on September 1, 2027, and the remaining units will vest in equal quarterly installments over the following three years, subject to his continuous service under the 2025 Equity Incentive Plan. After this grant, Winzeler directly holds 94,395 shares of Ambiq common stock.

Chen Sean Chihhsiang reported acquisition or exercise transactions in this Form 4 filing.

Ambiq Micro, Inc. President and COO Sean Chihhsiang Chen received an equity grant of 64,246 shares of common stock in the form of restricted stock units. The award was granted at no cash cost and increased his directly held common stock position to 120,275 shares.

Each RSU represents one share of common stock upon settlement. According to the vesting schedule, 25% of the RSUs will vest on September 1, 2027, with the remaining units vesting in equal quarterly installments over the following three years, subject to his continuous service under the company’s 2025 Equity Incentive Plan.

Hanson Scott McLean reported acquisition or exercise transactions in this Form 4 filing.

Ambiq Micro, Inc. director and Chief Technology Officer Scott McLean received a grant of 80,308 restricted stock units of Common Stock as equity compensation. These RSUs vest over time, with 25% vesting on September 1, 2027 and the remainder vesting quarterly thereafter, contingent on continued service. Following this award, McLean directly holds 203,126 shares of Common Stock.

Esaka Fumihide reported acquisition or exercise transactions in this Form 4 filing.

Ambiq Micro, Inc. reported that Chief Executive Officer Fumihide Esaka received a grant of 160,616 restricted stock units (RSUs) of common stock at no cost as equity compensation. Each RSU represents one share upon settlement. Following this award, he directly holds 391,189 shares. The RSUs vest over time: 25% of the shares are scheduled to vest on September 1, 2027, and the remaining shares vest in equal quarterly installments thereafter, contingent on his continued service under the company’s 2025 Equity Incentive Plan.

Ambiq Micro director-related entity exercises warrants for common shares. Matter Venture Partners Fund I, L.P., for which HSIEH Wen Hsuan exercises sole voting and dispositive control, exercised a warrant for 238,931 shares of Ambiq Micro common stock through a derivative conversion at an exercise price of $12.60 per share. After the transaction, the fund held 633,920 shares of Ambiq Micro common stock indirectly attributable to HSIEH Wen Hsuan.

Ambiq Micro, Inc. Chief Executive Officer and director Esaka Fumihide reported exercising stock options and acquiring additional common shares. On October 7, 2025, a stock option for 53,660 shares with a $5.88 exercise price was exercised, converting into 53,660 shares of common stock at $5.88 per share.

Following this transaction, Esaka Fumihide directly owned 230,573 shares of Ambiq Micro common stock, and the reported option position was reduced to zero. The option had vested over time, with vesting beginning in 2016 and subject to continued service and the issuer’s repurchase rights.

Ambiq Micro, Inc. director Joseph A. Tautges reported a sale of company stock. On January 26, 2026, he sold 7,800 shares of Ambiq Micro common stock at $31 per share in a single open-market transaction. After this sale, he beneficially owns 48,746 common shares, held in direct ownership form.

Ambiq Micro, Inc. director and Chief Technology Officer Hanson Scott McLean reported selling 10,000 shares of common stock on 01/26/2026 at $31 per share. After this transaction, he beneficially owns 122,818 shares of Ambiq Micro common stock, held directly.

Ambiq Micro, Inc. reported that its General Counsel, Michele Kim Connors, received equity awards in the form of restricted stock units tied to the company’s common stock. On January 5, 2026, she was granted 23,759 units and a separate grant of 5,483 units, both reported as acquisitions at a price of $0 per share. After these grants, she beneficially owned 29,242 shares of common stock.

The first grant vests over time, with 25% of the shares vesting on January 1, 2027 and the remaining shares vesting in equal quarterly installments, assuming continued service under the company’s 2025 Equity Incentive Plan. The second grant vests with 25% of the shares on April 1, 2026, and the remaining shares vesting in equal quarterly installments on the same service condition.

Ambiq Micro, Inc. reported a Form 4 showing that Jeffrey G. Winzeler, the company's Chief Financial Officer and a director, was granted 52,667 restricted stock units (RSUs) on 10/02/2025. The RSUs have a grant price of $0, meaning they are equity awards that convert to common stock upon settlement rather than a cash purchase.

Per the award terms, 25% of the RSUs vest on 10/01/2026, with the remainder vesting in equal quarterly installments at a rate of 1/12 of the total grant thereafter, subject to continued service under the 2025 Equity Incentive Plan. Following the grant, the reporting person beneficially owns 52,667 shares subject to the award, held directly.

Hanson Scott McLean, who serves as Chief Financial Officer and a director of Ambiq Micro, Inc. (AMBQ), received a grant of $0-priced restricted stock units totaling 83,819 RSUs on 10/02/2025. Each RSU converts into one share of common stock upon settlement. After the grant, the reporting person beneficially owns 132,818 shares in total. The RSUs vest 25% on 10/01/2026 with the remainder vesting in equal quarterly installments of 1/12 thereafter, subject to continued service under the 2025 Equity Incentive Plan. The grant was reported on the Form 4 filed and signed by an attorney-in-fact on 10/06/2025.

Ambiq Micro, Inc. (AMBQ) reported an insider equity award: Sean Chihhsiang Chen, the company's President and COO, received 56,029 restricted stock units (RSUs) on 10/02/2025. Each RSU converts to one share of common stock upon settlement and was granted at a $0 per-share price, indicating a compensatory award rather than a purchase. The RSUs vest 25% on 10/01/2026, with the remaining shares vesting in equal quarterly installments of 1/12 thereafter, subject to continuous service under the 2025 Equity Incentive Plan. The Form 4 discloses 56,029 shares beneficially owned following the grant.

Ambiq Micro director and CEO Fumihide Esaka received a grant of 159,907 restricted stock units (RSUs) on 10/02/2025. Each RSU converts to one share of common stock upon settlement, and following the grant the Reporting Person beneficially owned 176,913 shares. Under the disclosed vesting schedule, 25% of the RSUs vest on 10/01/2026, with the remainder vesting in equal 1/12 portions quarterly thereafter, contingent on continuous service under the company’s 2025 Equity Incentive Plan. The Form 4 was signed by an attorney-in-fact on 10/06/2025.