Form 4: Amprius CEO Sells Shares for Tax Obligations

Amprius Technologies CEO Kang Sun sold 68,655 shares of common stock at an average price of $10.0813 to cover tax withholding obligations related to restricted stock unit vesting.

Summary

• Kang Sun, Chief Executive Officer and Director of Amprius Technologies, Inc. (AMPX), reported a sale of common stock.
• The transaction involved the disposition of 68,655 shares of common stock on November 21, 2025.
• The shares were sold at an average price of $10.0813 per share, with individual transactions ranging from $10.05 to $10.13.
• The sale was non-discretionary and executed pursuant to sell-to-cover arrangements mandated by the issuer to fund tax withholding obligations associated with the vesting of restricted stock units.
• Following the transaction, Kang Sun directly beneficially owns 1,403,651 shares of common stock, which includes 1,285,576 restricted stock units.
• Additionally, 274,275 shares are indirectly beneficially owned through the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST, where Kang Sun and his spouse serve as co-trustees.

Sentiment

Score: 6

Explanation: The sentiment is neutral to slightly positive. While an insider sold shares, it was a non-discretionary sale to cover tax obligations from RSU vesting, which is a positive event for the executive. It does not signal a change in management's confidence in the company.

Positives

• The underlying event for the sale was the vesting of restricted stock units, indicating the executive met performance or tenure conditions.

Negatives

• The transaction resulted in a reduction of the CEO's direct common stock holdings by 68,655 shares.

Future Outlook

This filing does not contain any forward-looking statements or guidance regarding the company's future performance or outlook.

Management Comments

• The transaction was effected pursuant to non-discretionary, sell-to-cover arrangements mandated by the issuer to fund tax withholding obligations in connection with the vesting of restricted stock units.

Industry Context

Insider sales for tax withholding purposes upon RSU vesting are a common and routine occurrence across various industries, particularly in technology and growth companies that utilize equity compensation extensively. This type of transaction is generally not indicative of management's sentiment towards the company's future prospects but rather a mechanical event related to compensation and tax planning.

Related Party Transactions

• Kang Sun indirectly beneficially owns 274,275 shares through the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST, for which he and his spouse are co-trustees.

Stakeholder Impact

• Shareholders: Minimal impact as this is a routine, non-discretionary transaction for tax purposes, not signaling a change in company fundamentals or management's outlook.
• Employees: No direct impact mentioned, but the vesting of RSUs is a standard part of executive compensation.

Key Dates

Recommendation

This Form 4 reports a routine, non-discretionary 'sell-to-cover' transaction by the CEO to satisfy tax obligations upon RSU vesting. Such transactions are common and do not typically reflect a change in the executive's long-term view of the company's prospects. Therefore, this filing provides no new fundamental information that would warrant a change in investment recommendation; a 'hold' stance is appropriate unless other factors dictate otherwise.

Keywords

Amprius Technologies, AMPX, Kang Sun, Insider Trading, Form 4, Stock Sale, CEO, Restricted Stock Units, Tax Withholding, Equity Compensation