Form 4: Amprius Technologies Executive Sells Shares

Amprius Technologies Chief Technology Officer, Stefan Constantin Ionel, reported a transaction involving the sale of 28,812 shares of common stock.

Summary

• Stefan Constantin Ionel, Chief Technology Officer of Amprius Technologies, Inc., engaged in a transaction on May 21, 2026.
• This transaction involved the sale of 28,812 shares of common stock.
• The sale was executed under a non-discretionary, sell-to-cover arrangement to fund tax withholding obligations related to the vesting of restricted stock units.
• The shares were sold at an average price of $14.7884, with individual sales ranging from $14.54 to $15.08.
• Following this transaction, Mr. Ionel beneficially owns 804,518 shares of common stock, which includes 591,183 restricted stock units.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a neutral event. While it involves a sale of shares by an executive, it is clearly stated to be for tax withholding purposes under a pre-arranged plan, rather than a discretionary sale indicating a lack of confidence.

Positives

• The sale was conducted under a pre-arranged plan (Rule 10b5-1(c) affirmative defense conditions) to cover tax withholding obligations, indicating a planned and non-discretionary event.
• The reporting person continues to hold a significant number of shares (804,518) and restricted stock units (591,183), suggesting continued commitment to the company.

Negatives

• A portion of the executive's holdings was sold, which could be perceived negatively by the market, although it was for tax purposes.
• The sale represents a reduction in the executive's direct ownership of common stock.

Risks

• The filing does not explicitly mention any new risks or challenges. The transaction itself is a standard event for executives dealing with equity compensation.

Future Outlook

The filing does not contain forward-looking statements or guidance. It is a report of a past transaction.

Industry Context

StockSavvy.ai notes that insider sales for tax withholding purposes are common events for executives holding equity compensation. The key is to distinguish these planned sales from discretionary sales driven by negative views of the company's prospects. The sell-to-cover mechanism is a standard practice to manage tax liabilities without requiring the executive to sell shares on the open market at potentially unfavorable times.

Stakeholder Impact

• Shareholders: The sale is for tax withholding, not a signal of negative outlook, so the direct impact on share price due to sentiment is likely minimal. However, any sale by an executive can be scrutinized.
• Employees: The transaction relates to executive compensation and tax obligations, with no direct impact on other employees.
• Management: The transaction is a standard part of managing executive compensation and tax liabilities.

Next Steps

• The reporting person will continue to hold their remaining beneficial ownership, including restricted stock units, subject to vesting schedules and conditions.

Key Dates

Keywords

Amprius Technologies, AMPX, Form 4, Insider Trading, Stock Sale, Restricted Stock Units, Tax Withholding, Beneficial Ownership, Stefan Constantin Ionel, Chief Technology Officer