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Amprius Technologies director Wen Hsuan Hsieh reported an exercise-and-sell transaction in company stock. Hsieh exercised stock options for 270,251 shares of common stock at $2.61 per share, converting a derivative award into directly held shares.
On the same date, Hsieh then sold 282,500 shares of common stock at an average price of $18.546 per share and a further 130,646 shares at an average price of $18.2232 per share in open-market transactions. After these trades, Hsieh reported ownership of 44,444 shares, all in the form of restricted stock units that represent the right to receive common shares if vesting conditions are met.
Amprius Technologies director Steven Chu reported a combination of option exercises and share sales. On March 10 and 12, 2026, he exercised stock options covering 259,697 shares of common stock at exercise prices of $0.62 and $2.61 per share.
Over the same two days, he sold 322,197 shares of common stock in open-market transactions at average prices reported between $17.90 and $18.78 per share. Following these transactions, Chu directly holds 127,339 shares of Amprius common stock, including 44,444 restricted stock units that will settle in shares if vesting conditions are met.
AMPX filed a Form 144 notice reporting proposed sales of Common Stock tied to option exercises on 03/12/2026.
The notice lists proposed sales of 86,143 and 69,422 shares on 03/12/2026 associated with exercises under a registered plan. It also records a prior sale of 166,632 shares on 03/10/2026 by Steven Chu for $2,985,428.90.
AMPX insider reported a proposed sale of 270,251 shares of Common stock on 03/12/2026. The filing lists the sale as resulting from an exercise of options under a registered plan for cash.
The filing also lists restricted stock vesting events of 17,895 shares (vested 06/09/2024) and 125,000 shares (vested 06/07/2025) as context for the position change.
AMPX reported proposed sales of Common Stock under registered plans. The filing lists 62,500 shares associated with restricted stock vesting on 06/07/2025 and 104,132 shares from an exercise of options on 03/10/2026, each described as "under a registered plan" and shown as sales by the issuer.
Amprius Technologies, Inc. reported that Chief Financial Officer Ricardo C. Rodriguez acquired 150,000 restricted stock units, each representing one share of common stock, at a price of $0.00 per unit. These units vest 1/16 starting on May 20, 2026 and quarterly thereafter until fully vested on February 20, 2030, subject to continued service. Following this award, he holds 350,000 restricted stock units in total.
Amprius Technologies, Inc. reported that Chief Executive Officer Thomas M. Stepien acquired 150,000 shares of common stock in the form of restricted stock units on March 4, 2026, at a price of $0.00 per share.
Each restricted stock unit represents the right to receive one share of common stock. According to the vesting schedule, 1/16 of the shares subject to the award will vest on May 20, 2026 and then quarterly on each August 20, November 20, February 20 and May 20, subject to his continued service, until the award is fully vested on February 20, 2030.
Following this grant, Stepien directly holds a total of 760,000 shares of common stock, which includes 750,000 restricted stock units that each represent a contingent right to receive one share, subject to their applicable vesting schedules and conditions.
Stefan Constantin Ionel reported acquisition or exercise transactions in this Form 4 filing.
Amprius Technologies, Inc. Chief Technology Officer Stefan Constantin Ionel reported an award of 110,000 shares of common stock in the form of restricted stock units at a price of $0.0000 per share. These RSUs vest 1/16 on May 20, 2026 and then quarterly on August 20, November 20, February 20 and May 20 until fully vested on February 20, 2030. Following this award, he directly holds 833,330 shares/units in total, including 643,440 restricted stock units subject to their respective vesting conditions.
Amprius Technologies, Inc. provides an overview of its silicon-anode lithium-ion battery business, focusing on high‑energy, fast‑charging cells for aviation, drones, HAPS, eVTOL and light electric vehicles. The company highlights over 500 customer engagements and more than 4.2 million battery cells shipped through December 31, 2025.
Amprius now relies heavily on its SiCore platform, produced via global contract manufacturers with access to over 2.0 GWh of annual capacity, while its Fremont facility is being expanded to a 10 MWh SiCore pilot line under a $14.8 million DIU contract. It recorded $19.1 million in impairment charges tied to terminating a large Brighton, Colorado factory lease and agreed to end that lease for a one‑time $20.0 million payment. The report also stresses concentration risk, noting one customer generated $27.1 million of 2025 revenue, and details extensive technology IP, regulatory exposure, and comprehensive risk factors.
Amprius Technologies reported very strong growth for 2025, with revenue rising 202% to $73.0 million and fourth-quarter revenue up 137% year over year to $25.2 million. Q4 gross margin improved to 24%, supporting the company’s first positive quarterly non-GAAP adjusted EBITDA of $1.8 million.
Full-year net loss was $44.0 million, including a $22.5 million impairment tied to a terminated Colorado facility; excluding this, adjusted net loss was $21.5 million and adjusted EBITDA was $(5.3) million. Management expects at least $125.0 million of revenue in 2026, net loss under $8.0 million, and at least $4.0 million of positive adjusted EBITDA, reflecting confidence in its contract manufacturing model and growing defense and aerospace demand.