Ambiq Micro, Inc. filings document the public-company record for a fabless semiconductor issuer focused on ultra-low-power edge AI chips and software. Its SEC disclosures include S-1 registration materials for common stock offerings, 8-K reports on quarterly and annual financial results, and exchange-listing details for AMBQ common stock on the New York Stock Exchange.
Proxy and current-report filings cover shareholder voting matters, director elections, audit-firm ratification, board composition, executive compensation, equity awards, and other governance subjects. Capital-structure disclosures identify common stock terms and offering-related updates.
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. director Timothy Chen filed an amended initial ownership report detailing an indirect position in Series F-1 Convertible Preferred Stock held through Triumph Way Investment Inc. This preferred stock is convertible into 70,592 shares of common stock at any time at his election.
According to the disclosure, Chen beneficially owns 1,707,853 shares of Series F-1 Convertible Preferred Stock, which will automatically convert into 70,592 common shares immediately before the closing of Ambiq Micro’s initial public offering. The filing reflects holdings and does not report new purchases or sales.
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.
AMBQ filing a Form 144 notice for proposed sales related to option exercises dated 05/15/2026. The broker listed is Morgan Stanley Smith Barney LLC. The excerpt lists 55,685 common shares and two exercise-related line items of 23,093 and 32,592 shares, with a dollar figure of $3,947,281.34.
AMBIQ MICRO INC ownership disclosure: T. Rowe Price Investment Management, Inc. reports beneficial ownership of 1,267,551 shares of Common Stock, representing 6.0% of the class as of 03/31/2026.
The filing shows sole voting power and sole dispositive power over 1,267,551 shares. The form is signed by Ellen York as Vice President on 05/15/2026. The filing includes a stated denial that the filer is the beneficial owner.