Form 4: Amprius Director Kang Sun Sells Shares

Amprius Technologies Director Kang Sun exercised stock options and subsequently sold over 500,000 shares of common stock under a pre-arranged 10b5-1 trading plan.

Summary

• Kang Sun, a Director of Amprius Technologies, Inc., executed multiple transactions on January 12, 2026.
• Exercised stock options to acquire 180,802 shares at $0.62, 208,264 shares at $2.44, and 117,201 shares at $2.50.
• Sold 506,267 shares of common stock at an average price of $10.0964, with prices ranging from $10.00 to $10.25.
• All transactions were conducted under a Rule 10b5-1 trading plan adopted 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 held by the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST.

Sentiment

Score: 4

Explanation: The sale of a significant number of shares by a director, even under a 10b5-1 plan, can be perceived as a slight negative by the market, though the pre-scheduled nature mitigates some of the concern. The director still retains substantial holdings.

Positives

• The transactions were executed under a pre-arranged Rule 10b5-1 trading plan, indicating a planned sale rather than a reaction to new, negative information.
• The director still retains a significant beneficial ownership of 1,403,651 direct shares (including RSUs) and 274,275 indirect shares.

Negatives

• A director selling a substantial number of shares (506,267) could be perceived negatively by investors, potentially signaling a desire for diversification or liquidity rather than strong future confidence.

Future Outlook

NA

Industry Context

This filing is specific to an individual director's stock transactions and does not provide broader industry context or trends.

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.

Stakeholder Impact

• Shareholders: The sale by a director could lead to a perception of reduced insider confidence, potentially influencing short-term stock price movements. However, the 10b5-1 plan context suggests a pre-planned diversification or liquidity event rather than a reaction to new company-specific news.
• Employees, Customers, Suppliers, Creditors: Unlikely to have a direct impact from an individual director's stock transaction.

Key Dates

Recommendation

While the sale of shares by a director can sometimes signal a lack of confidence, the execution under a Rule 10b5-1 plan suggests a pre-planned financial event rather than a reaction to new, negative company information. The director still retains a substantial number of shares and RSUs. Without additional company-specific news, this transaction alone does not warrant a change from a 'hold' position, but it should be monitored in conjunction with other company developments.

Keywords

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