Welcome to our dedicated page for Amprius Technologies SEC filings (Ticker: AMPX), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
Amprius Technologies, Inc. filings document operating results, material events, governance matters and capital-structure disclosures for a public battery technology company. Its 8-K reports include quarterly and annual financial-result releases, material agreement updates, auditor changes, lease-related matters, and equity offering activity.
Amprius disclosure records also cover proxy and shareholder voting matters, emerging growth company status, common stock, redeemable warrants, and board and executive compensation topics. These filings provide the formal record for the company's silicon-anode battery business, security structure, financing activity, risk disclosures and corporate governance practices.
Amprius Technologies, Inc. Chief Technology Officer Stefan Constantin Ionel reported an open-market sale of 28,812 shares of common stock on May 21, 2026 at an average price of $14.7884 per share. According to the disclosure, this sale was a non-discretionary, sell-to-cover transaction mandated by the company to fund tax withholding obligations related to vesting restricted stock units. After the sale, Ionel directly held 804,518 shares of common stock, including 591,183 restricted stock units that may convert into shares as vesting conditions are met.
Amprius Technologies CEO Thomas M. Stepien reported an open-market sale of 60,702 shares of common stock at an average price of $14.7884 per share. According to the disclosure, this non-discretionary sale was mandated by the company to cover tax withholding obligations tied to the vesting of restricted stock units.
After the sale, Stepien holds 699,298 shares directly, which the filing states includes 625,000 restricted stock units that may convert into common shares as they vest under their applicable schedules and conditions.
Amprius Technologies filed an amendment to update details on its recently completed warrant-for-share exchange. On May 18 and May 19, 2026, the company issued an aggregate of 2,726,631 shares of common stock to institutional holders in exchange for 7,128,458 public warrants, which were surrendered and cancelled.
The shares were issued as unregistered securities in private transactions relying on Section 4(a)(2) of the Securities Act, meaning they cannot be freely resold in the United States without an effective registration statement or a valid exemption.
Amprius Technologies, Inc. entered into Warrant Exchange Agreements with certain institutional holders of its public warrants. These holders agreed to exchange an aggregate of 7,128,458 public warrants, each with a strike price of $11.50 per share, for shares of common stock.
The number of shares each holder receives will be based on a formula using the four-day average volume-weighted average price of the common stock, adjusted by adding $0.35 and subtracting the exercise price, then dividing by the same average price. Closing of the exchanges is expected on May 18, 2026, subject to customary conditions, and the unregistered issuance of these shares relies on the Section 4(a)(2) exemption under the Securities Act.
Stepien Thomas M reported acquisition or exercise transactions in this Form 4 filing.
Amprius Technologies, Inc. reported that Chief Executive Officer Thomas M. Stepien received a grant of 200,000 shares of common stock at a price of $0.00 per share as a compensation-related award. Following this grant, he directly holds 760,000 shares of Amprius common stock.
The amended filing clarifies the vesting schedule for the underlying restricted stock units. 2/16 of the shares will vest on May 20, 2026, and 1/16 will vest quarterly on each August 20, November 20, February 20, and May 20, subject to his continued service, until the award is fully vested on November 20, 2029.
Amprius Technologies reported strong Q1 2026 revenue growth but continued losses and heavy cash use. Revenue rose to $28.5 million from $11.3 million, driven by higher SiCore battery sales and new customers, lifting gross margin to 20% from a negative margin a year earlier. Operating expenses increased as the company expanded R&D and administrative functions, and Amprius posted a net loss of $5.0 million, improved from a $9.4 million loss.
Cash and cash equivalents were $62.4 million as of March 31, 2026, but operating cash outflow was $37.3 million, largely due to a $20.0 million payment to terminate the Brighton, Colorado plant lease. The company now relies on a global contract manufacturing network and is expanding its Fremont pilot line, supported by an $18.1 million U.S. Defense Innovation Unit contract and related government grant income. Revenue remains concentrated, including sizable shipments into EMEA and Ukraine, and the business continues to face global macro, defense and trade risks.
Amprius Technologies, Inc. director Sun Kang received an equity compensation grant of 6,250 shares of common stock in the form of restricted stock units at a price of $0.00 per share. This is a grant/award acquisition rather than an open-market purchase.
Each restricted stock unit represents the right to receive one share of common stock, subject to vesting. One-eighth of the award will vest on May 20, 2026, with additional vesting each quarter on August 20, November 20, February 20 and May 20 until the grant is fully vested on February 20, 2028, assuming continued service. After this grant, Kang directly holds 1,348,650 shares, including 1,165,635 restricted stock units.