Amprius Technologies, Inc. SEC Filings

Amprius Technologies, Inc. (AMPX) filed a Form 4 reporting insider transactions by its Chief Executive Officer and director, Kang Sun, on 11/17/2025. Sun exercised multiple stock options for Amprius common stock at exercise prices of $0.98, $0.05, and $0.62 per share and then reported an open market sale of 1,000,000 shares at an average price of $10.5953 per share.

The filing states these option exercises and related sales were carried out under a Rule 10b5-1 trading plan adopted on August 18, 2025. After the reported transactions, Sun beneficially owned 1,472,306 shares directly, which includes 1,411,769 restricted stock units, and an additional 274,275 shares indirectly through a family trust where he and his spouse serve as co-trustees.

A shareholder of AMPX filed a Form 144 notice to sell 1,000,000 shares of common stock through Morgan Stanley Smith Barney LLC on the NYSE, with an aggregate market value of $11,290,000. The table shows 130,483,838 shares of common stock outstanding. The shares to be sold were acquired on 11/17/2025 by exercising stock options for cash on the same date.

Over the past three months, an individual named Kang Sun sold 65,654 common shares for gross proceeds of $447,510.79. The signer represents that they are not aware of undisclosed material adverse information about AMPX’s current or prospective operations at the time of this planned sale.

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.