Amprius Tech SEC Filings

Amprius Technologies (AMPX) CEO Kang Sun reported an automatic sale of company stock. On 11/21/2025, he disposed of 68,655 shares of Amprius common stock at an average price of $10.0813 per share in a transaction coded "S." The sale was carried out under a non-discretionary, sell-to-cover arrangement mandated by the company to fund tax withholding obligations tied to the vesting of restricted stock units, meaning the sale was for tax purposes rather than an open-market portfolio decision.

Following this transaction, Kang Sun beneficially owned 1,403,651 shares directly, which include 1,285,576 restricted stock units that may convert into common shares if vesting conditions are met. He also indirectly held 274,275 shares through the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST, where he and his spouse serve as co-trustees.

AMPX68,655 shares of common stock through broker Morgan Stanley Smith Barney LLC on the NYSE, with an indicated aggregate market value of 692,132. The company’s common shares outstanding are listed as 132,344,849 as of the figures in this notice.

The seller acquired 126,193 common shares on 11/20/2025 via a release of restricted stock units from the issuer as compensation. The notice also reports that during the past three months, Kang Sun sold 1,000,000 common shares on 11/17/2025 for gross proceeds of 10,595,300. By signing the notice, the seller represents that they are not aware of any undisclosed material adverse information about AMPX’s current or prospective operations.

A holder of AMPX25,024 shares through Morgan Stanley Smith Barney LLC on the NYSE, with an aggregate market value of 252,274. These shares are part of a larger base of 132,344,849 shares outstanding of the issuer’s common stock. The seller recently acquired 52,256 common shares on 11/20/2025 through the release of restricted stock units as compensation, and now plans to begin sales around 11/21/2025. By signing the notice, the seller represents that they are not aware of any undisclosed material adverse information about the issuer’s current or prospective operations.

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)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.