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.
This page provides access to U.S. SEC filings for Amprius Technologies, Inc. (NYSE: AMPX), a manufacturer of high-energy and high-power lithium-ion batteries based on a Silicon Anode Platform. These regulatory documents offer detailed insight into the company’s operations, capital structure, executive changes, and financing activities.
Amprius uses current reports on Form 8-K to disclose material events. Recent 8-K filings describe the completion of an at-the-market equity offering program established under an At Market Issuance Sales Agreement, including the aggregate offering size and the resulting net proceeds. Other 8-Ks outline leadership transitions, such as the planned change in Chief Executive Officer, the appointment of a new Chief Financial Officer, and related employment and consulting arrangements, including salary, bonus eligibility, equity awards, and severance terms.
Investors and analysts can also use Amprius’ SEC filings to follow its periodic financial reporting. The company has filed 8-Ks to announce quarterly business and financial results and to furnish letters to shareholders discussing results for specific quarters. These filings complement the company’s earnings press releases and conference calls by providing formal disclosure under SEC rules.
On Stock Titan, AI-powered tools summarize lengthy filings so readers can quickly understand the key points in Amprius’ 10-K annual reports, 10-Q quarterly reports, and 8-K current reports, without needing to parse every technical detail. The platform also surfaces information related to equity compensation, executive employment agreements, and capital-raising activities. Real-time updates from EDGAR ensure that new filings, including any future Forms 4 reporting insider transactions, become available promptly with plain-language explanations to help users interpret their significance.
Amprius Technologies director Sun Kang exercised stock options and sold shares in a pre-planned trade. On April 1, 2026, he exercised options for a total of 1,500,000 shares of common stock at strike prices of $1.78 and $3.68 per share, then sold 1,500,000 shares in open-market transactions at average prices of $15.7328 and $16.7829, with actual sale prices ranging from $15.37 to $17.31.
Following these transactions, he holds 1,342,400 shares directly and 56,406 shares indirectly through the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST. His holdings also include 1,159,385 restricted stock units, each representing a contingent right to one share. All reported trades were executed under a Rule 10b5-1 trading plan adopted on August 18, 2025, indicating they were pre-scheduled rather than discretionary.
Morgan Stanley Smith Barney LLC Executive Financial Services filed a Form 144 notifying the proposed sale of 1,500,000 shares of Common stock to be sold on 04/01/2026 pursuant to an exercise of stock options for cash. The filing also lists recent 10b5-1 dispositions by KANG SUN during Jan–Mar 2026, including sales of 950,548 and 506,267 shares on 01/16/2026 and 01/12/2026 respectively.
The Vanguard Group amended a Schedule 13G filing to report zero beneficial ownership of Amprius Technologies, Inc. common stock. The amendment follows an internal realignment effective January 12, 2026 under SEC Release No. 34-39538 and states certain Vanguard subsidiaries will report separately.
The filing lists Amount beneficially owned: 0 and Percent of class: 0%, and confirms no sole or shared voting or dispositive power over Amprius shares. The filing is signed by Ashley Grim on 03/26/2026.
Amprius Technologies director Sun Kang, through the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST, reported open-market sales of a total of 217,869 shares of common stock on March 23, 2026. The shares were sold in two tranches at average prices of $18.6863 and $19.0589, with individual trade prices ranging from $17.89 to $19.36. These transactions were executed under a pre-arranged Rule 10b5-1 trading plan adopted on August 18, 2025. Following the sales, the trust held 56,406 shares indirectly, while Kang also held 1,342,400 shares directly, including 1,159,385 restricted stock units subject to vesting conditions.
AMPX notice of proposed sale: 192,727 shares of Common stock (listed as Restricted Stock Units) are presented for resale. The filing lists multiple 10b5-1 sales by KANG SUN, including sales of 950,548, 506,267, 61,251, and 43,185 shares on various dates in January–February 2026.
Transactions are reported as 10b5-1 plan sales; cash‑flow treatment and further qualifiers are those shown in the excerpt.
RODRIGUEZ RICARDO C. reported acquisition or exercise transactions in this Form 4 filing.
Amprius Technologies, Inc. reported that its Chief Financial Officer, Ricardo C. Rodriguez, received a grant of 150,000 shares of common stock on March 4, 2026 at a price of $0.00 per share. Following this equity award, he directly owns 350,000 shares.
This amended filing corrects the vesting schedule for the previously reported restricted stock units. According to the updated terms, 3/16 of the shares will vest on November 20, 2026, with additional portions vesting quarterly on February 20, May 20, August 20 and November 20 until the award is fully vested on February 20, 2030, subject to his continued service.
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.