Welcome to our dedicated page for Amprius Tech 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. held its 2026 annual meeting of stockholders on June 11, 2026. Stockholders elected Kathleen Bayless and Thomas M. Stepien as directors to serve until the 2029 annual meeting of stockholders or until their successors are elected and qualified.
Bayless received 50,367,535 votes for and 20,194,821 votes withheld, while Stepien received 53,880,993 votes for and 16,681,363 votes withheld, with 26,519,800 broker non-votes for each. Stockholders also ratified Deloitte & Touche LLP as independent registered public accounting firm for the fiscal year ending December 31, 2026, with 96,014,911 votes for, 85,854 against and 981,391 abstentions.
BAYLESS KATHLEEN A reported acquisition or exercise transactions in this Form 4 filing.
Amprius Technologies, Inc. director Kathleen A. Bayless received a grant of 10,423 restricted stock units, each representing one share of common stock. These units vest 100% on the earlier of the one-year anniversary of the grant date or the day before the next annual stockholders’ meeting, subject to her continued service. Following this award, she directly holds 216,120 shares of common stock, including the 10,423 restricted stock units.
SATTERTHWAITE LIVINGSTON reported acquisition or exercise transactions in this Form 4 filing.
Amprius Technologies director Livingston Satterthwaite received an equity award in the form of restricted stock units. The Form 4 reports a grant of 10,423 restricted stock units, each representing one share of common stock at no cash cost per unit. All of these units vest 100% on the earlier of the one-year anniversary of the grant date or the day before the next annual meeting of stockholders, if he continues to serve through that date. Following this grant, he is reported as beneficially owning 346,506 shares in total, including 199,102 restricted stock units that remain subject to their respective vesting conditions.
Amprius Technologies director Donald R. Dixon reported both an insider sale and an equity award in common stock. An entity associated with him, Donald & Elizabeth Dixon 2004 Family Partners, completed an open-market sale of 85,000 shares of Amprius Technologies common stock at an average price of $17.1672 per share, leaving 359,380 shares held indirectly after the transaction. Separately, Dixon received a grant of 10,423 restricted stock units, each representing one share of common stock, bringing his directly held common stock (including these units) to 280,079 shares.
Chu Steven reported acquisition or exercise transactions in this Form 4 filing.
Amprius Technologies, Inc. director Steven Chu received a grant of 10,423 restricted stock units, each representing the right to receive one share of common stock at no purchase price. The units vest 100% on the earlier of the one-year anniversary of grant or the day before the next annual stockholder meeting, subject to his continued service. Following this award, Chu holds 137,762 shares of the company’s common stock directly, including the 10,423 restricted stock units subject to vesting conditions.
Amprius Technologies director Donald R. Dixon reported an indirect open-market sale of 40,000 shares of common stock at $19.13 per share. The transaction was coded as an open-market sale and involved indirectly held shares tied to family trust and partnership structures described in the footnotes.
After these transactions, Dixon reports 269,656 shares held directly and two separate indirect positions of 163,142 shares and 444,380 shares, respectively. The filing indicates these indirect holdings are through The Dixon Revocable Trust and the Donald & Elizabeth Dixon 2004 Family Partners, where he has roles described in the footnotes.
The Charles Schwab Corporation submitted a Rule 144 notice regarding the proposed sale of 125,000 shares of Common Stock tied to a Restricted Stock Unit award dated 06/07/2025. The filing also records 17,895 shares sold during the past three months with an aggregate reported value of $320,252.36. Shares outstanding are listed as 141,627,170 as of 06/08/2026.
Amprius Technologies Chief Executive Officer Thomas M. Stepien reported a mix of open-market selling and gifts of company stock. On June 4, 2026, he sold 2,000 shares of common stock at $20.97 per share in an open-market transaction.
On the same date, he made bona fide gifts totaling 104,212 shares of common stock, including transfers to the Rogers Stepien Family Revocable Trust. After these transactions, he holds 625,625 shares directly and 36,914 shares indirectly through the trust, and footnotes state his holdings include 615,625 restricted stock units that may convert into shares over time.
Amprius Holdings, Inc. (AMPX) reported Form 144 notices for proposed sales of Common Stock. The filing lists a restricted stock vesting distribution of 2,000 shares on 05/20/2026 and multiple share sale notifications by Thomas Stepien totaling 64,977 shares across dates in May 2026.
The transactions are described as sales or dispositions under Rule 144 tied to services-rendered vesting and open-market sales; cash-flow treatment and buyer counterparties are not specified in the provided excerpt.
Amprius Technologies director Sun Kang reported a small tax-related share sale. On this Form 4, Kang disclosed an open-market sale of 356 shares of common stock on May 27, 2026 at an average price of $17.1935 per share.
According to the footnotes, this transaction was a non-discretionary sell-to-cover mandated by the company to fund tax withholding on vesting restricted stock units. After the sale, Kang held 1,280,498 shares directly, including 1,038,662 restricted stock units, and 56,406 shares indirectly through the Kang & Cecillia Sun Family Revocable Trust.