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 (AMPX) reported strong top-line growth. Revenue reached $21.4M for the quarter ended September 30, 2025, up from $7.9M a year ago, driven by SiCore battery sales and broader customer adoption. Gross profit was $3.3M with a 15% margin, compared with a gross loss last year. Net loss narrowed to $3.9M from $10.9M.
Year‑to‑date, revenue was $47.8M versus $13.5M last year; net loss improved to $19.6M. Cash and cash equivalents were $73.2M at quarter‑end. Operating cash outflow was $27.6M year‑to‑date, offset by $48.0M from financing, including $44.1M net from the at‑the‑market program, with $20.1M remaining capacity as of quarter‑end.
Accounts receivable increased to $21.9M with one customer representing 35% of quarterly revenue. Remaining performance obligations totaled about $53.3M, expected within one year. Shares outstanding were 130,483,838 as of October 30, 2025.
Amprius Technologies (AMPX) reported that it announced its business and financial results for the third fiscal quarter ended September 30, 2025. The company furnished a Letter to Shareholders as Exhibit 99.1 to a Form 8-K under Item 2.02.
The information in Item 2.02 and Exhibit 99.1 is furnished, not filed, is not subject to Section 18 of the Exchange Act, and is not incorporated by reference unless expressly stated.
The Vanguard Group reported a passive stake in Amprius Technologies (AMPX) on a Schedule 13G. Vanguard beneficially owns 6,512,620 shares of common stock, representing 5.20% of the class as of 09/30/2025.
Vanguard has shared voting power over 823,477 shares and no sole voting power. It reports sole dispositive power over 5,579,631 shares and shared dispositive power over 932,989 shares. Vanguard certifies the securities were acquired and are held in the ordinary course and not to change or influence control. The stake is held on behalf of clients, and no single other person’s interest exceeds 5%.
BlackRock, Inc. filed a Schedule 13G reporting beneficial ownership of 7,297,002 shares of Amprius Technologies (AMPX) common stock, representing 5.8% of the class as of September 30, 2025.
BlackRock reports sole voting power over 7,133,356 shares and sole dispositive power over 7,297,002 shares, with no shared voting or dispositive power. The filing states the securities are held in the ordinary course and not for the purpose of changing or influencing control.
Ricardo C. Rodriguez, Chief Financial Officer of Amprius Technologies, Inc. (AMPX), was granted 200,000 restricted stock units on 10/06/2025. Each restricted stock unit converts to one share of common stock. The award vests 25% on 11/20/2026 with the remainder vesting quarterly on 02/20, 05/20, 08/20 and 11/20 through 11/20/2029, subject to continued service. Following the grant, Mr. Rodriguez beneficially owns 200,000 shares directly. The filing was signed on 10/08/2025.
Amprius Technologies, Inc. (AMPX) filed an initial Form 3 for Ricardo C. Rodriguez, who is reported as the company's Chief Financial Officer. The filing, dated 10/06/2025 for the event and signed 10/08/2025, states that no securities are beneficially owned by the reporting person. The submission includes a Power of Attorney exhibit and a manual signature. This is a routine Section 16 disclosure showing an officer has no reportable equity or derivative positions at the time of filing.
Amprius Technologies, Inc. (AMPX) appointed Matthew Rodriguez as Chief Financial Officer and engaged outgoing CFO Ms. Wallach as a consultant to support transition. Mr. Rodriguez will receive an annual base salary of $451,000, a one-time sign-on bonus of $80,000 (repayable if he voluntarily leaves within 12 months), and relocation/temporary housing support up to $50,000 (also subject to repayment). He becomes eligible for an annual cash bonus beginning in 2026 with a target equal to 65% of base salary, based on Board-determined performance goals.
Equity compensation includes 200,000 restricted stock units granted with an October 6, 2025 grant date: 25% vests after one year and the remainder vests quarterly over three years, subject to continued employment. If terminated without Cause (or for Good Reason by Mr. Rodriguez) he is eligible for three months of base-salary continuation upon execution of a release. Ms. Wallach will provide transitional CFO services at $200 per hour under a consulting agreement.
Amprius Technologies, Inc. announced that Chief Financial Officer Sandra Wallach intends to retire from her role. Her retirement will become effective upon the appointment of a successor, which is expected by or before the end of the fourth quarter of 2025.
The company states that her decision is not due to any disagreement related to operations, policies, or practices. After stepping down as CFO, she plans to remain involved with Amprius in a consulting or other capacity to help ensure a smooth transition.
The Board of Directors has begun a formal process to identify and recruit the next Chief Financial Officer, aiming for continuity in financial leadership as this planned transition moves forward.
Amprius Technologies, Inc. announced that Chief Financial Officer Sandra Wallach intends to retire from her role. Her retirement will become effective upon the appointment of a successor, which is expected by or before the end of the fourth quarter of 2025.
The company states that her decision is not due to any disagreement related to operations, policies, or practices. After stepping down as CFO, she plans to remain involved with Amprius in a consulting or other capacity to help ensure a smooth transition.
The Board of Directors has begun a formal process to identify and recruit the next Chief Financial Officer, aiming for continuity in financial leadership as this planned transition moves forward.
Insider transaction summary: The Chief Technology Officer of Amprius Technologies, Inc. sold 19,159 shares of common stock on 08/21/2025 at an average price of $6.8162 per share. The filing states these sales were effected under non-discretionary, sell-to-cover arrangements required by the company to satisfy tax withholding obligations arising from the vesting of restricted stock units. After the reported disposition, the reporting person beneficially owns 846,975 shares, which include 637,953 restricted stock units that convert to one share each subject to vesting schedules. The Form 4 was signed on 08/25/2025.
Insider sale tied to RSU vesting: Sandra Wallach, Chief Financial Officer of Amprius Technologies, sold 28,390 shares on 08/21/2025 under non-discretionary sell-to-cover arrangements to satisfy tax withholding for vested restricted stock units. The reported average execution price was $6.8162, with transaction prices ranging from $6.78 to $6.91. After the sale, Wallach beneficially owns 1,005,275 shares, which includes 803,914 restricted stock units that remain subject to vesting conditions. The filing is a routine Section 16 disclosure showing a tax-driven disposition rather than an open-market sell decision.