Form 4: Amprius CTO Sells Shares for Tax Obligations

Amprius Technologies' Chief Technology Officer, Stefan Constantin Ionel, sold 25,366 shares of common stock to cover tax withholding obligations related to restricted stock unit vesting.

Summary

• Stefan Constantin Ionel, Chief Technology Officer of Amprius Technologies, Inc. (AMPX), reported a sale of common stock.
• The transaction occurred on February 23, 2026.
• A total of 25,366 shares were sold at an average price of $10.1555 per share.
• The sales were executed 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.
• Following the transaction, Mr. Ionel beneficially owns 723,330 shares, which includes 533,440 restricted stock units.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a neutral event. The sale is a routine, non-discretionary transaction to cover tax obligations related to RSU vesting, rather than a discretionary sale indicating a change in executive sentiment.

Positives

• The transaction was non-discretionary, mandated by the issuer to fund tax withholding obligations, indicating a routine compensation event rather than a discretionary sale based on market outlook.

Negatives

• A reduction in direct beneficial ownership by a key executive, even if for tax purposes, slightly decreases insider alignment.

Future Outlook

No forward-looking statements or guidance are provided in this Form 4 filing.

Industry Context

StockSavvy.ai notes that "sell-to-cover" transactions are a standard practice in executive compensation plans, particularly for restricted stock units (RSUs) or stock options, where a portion of the vested shares is automatically sold to cover income tax liabilities. This is a common, non-discretionary event and typically does not signal a change in management's outlook on the company's future.

Comparison to Industry Standards

• Sell-to-cover transactions are a common mechanism across industries for executives to manage tax obligations arising from equity compensation. For example, executives at tech companies like Apple or Microsoft frequently engage in similar transactions upon RSU vesting. This transaction by Amprius's CTO aligns with standard industry practices for executive equity compensation and tax management.

Related Party Transactions

• This filing details an insider transaction, specifically the sale of common stock by the Chief Technology Officer, which is a form of related party dealing.

Stakeholder Impact

• Shareholders: A minor, non-discretionary reduction in insider ownership, which is generally not seen as a significant signal.

Key Dates

Recommendation

This Form 4 filing details a routine, non-discretionary "sell-to-cover" transaction by a key executive to meet tax obligations on vested restricted stock units. Such transactions are common and do not typically reflect a change in the executive's confidence in the company's future or its operational performance. Therefore, this filing alone does not provide sufficient new information to warrant a change in investment recommendation, suggesting a "hold" position is appropriate based solely on this report.

Keywords

Amprius Technologies, AMPX, Form 4, insider trading, stock sale, Chief Technology Officer, restricted stock units, RSU vesting, tax withholding, executive compensation