Form 4: Amprius Director Sells Shares After Option Exercises

Amprius Technologies Director Kang Sun executed pre-planned option exercises and subsequent sales of common stock in January 2026.

Summary

• Director Kang Sun engaged in multiple transactions involving Amprius Technologies, Inc. common stock in January 2026.
• On January 16, 2026, 850,338 shares were acquired through option exercise at $2.50 per share.
• Also on January 16, 2026, an additional 100,210 shares were acquired through option exercise at $1.78 per share.
• Following these exercises on January 16, 2026, 950,548 shares were sold at an average price of $11.0659 per share, with prices ranging from $11.00 to $11.20.
• On January 20, 2026, 43,185 shares were acquired through option exercise at $1.78 per share.
• Subsequently on January 20, 2026, 43,185 shares were sold at an average price of $11.0287 per share, with prices ranging from $11.00 to $11.10.
• All reported exercises and sales were conducted under a Rule 10b5-1 trading plan established on August 18, 2025.
• Following these transactions, Kang Sun directly beneficially owns 1,403,651 shares, which includes 1,285,576 restricted stock units.
• An additional 274,275 shares are indirectly beneficially owned through the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST.

Sentiment

Score: 6

Explanation: The sentiment is neutral to slightly positive. While insider sales can sometimes be viewed negatively, the fact that these transactions were pre-planned under a Rule 10b5-1 plan mitigates concerns about immediate insider sentiment. The exercises at low strike prices demonstrate profitability for the insider.

Positives

• Director Kang Sun exercised stock options at significantly lower prices ($1.78 and $2.50) compared to the sale prices (over $11.00), indicating a profitable transaction for the insider.
• The transactions were executed under a pre-arranged Rule 10b5-1 trading plan, which suggests a systematic approach to managing personal holdings rather than a reaction to immediate company news.

Negatives

• Director Kang Sun sold a substantial number of shares (950,548 shares at an average of $11.0659 and 43,185 shares at an average of $11.0287), which could be interpreted by some investors as a reduction in insider conviction, despite being pre-planned.

Related Party Transactions

• 274,275 shares are indirectly held by the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST, for which the reporting person and his spouse are co-trustees. This represents an indirect beneficial ownership by a related party.

Stakeholder Impact

• Shareholders: The sale of shares by a director, even if pre-planned, could be perceived as a reduction in insider confidence, potentially influencing investor sentiment. However, the pre-planned nature under Rule 10b5-1 often lessens this impact.

Key Dates

Recommendation

The transactions are routine insider sales executed under a pre-planned 10b5-1 trading plan, which typically does not signal a change in the company's fundamental outlook or the insider's long-term view. While a director selling shares might raise questions, the pre-scheduled nature suggests personal financial planning rather than a reaction to new, negative information. Therefore, a 'hold' recommendation is appropriate as this filing alone does not provide new information to warrant a change in investment thesis.

Keywords

Amprius Technologies, AMPX, Form 4, Insider Trading, Stock Options, Share Sale, Director Transactions, Kang Sun, 10b5-1 Plan, Beneficial Ownership