Form 4: Amprius CEO Sells 1 Million Shares After Option Exercises

Amprius Technologies CEO Kang Sun exercised stock options and subsequently sold 1 million shares of common stock for over $10 million under a pre-arranged trading plan.

Summary

• Kang Sun, CEO and Director of Amprius Technologies, Inc. (AMPX), engaged in a series of transactions on November 17, 2025.
• These transactions included the exercise of stock options to acquire a total of 1,000,000 shares of common stock at exercise prices ranging from $0.05 to $0.98 per share.
• Immediately following the option exercises, Mr. Sun sold 1,000,000 shares of Amprius common stock at an average price of $10.5953 per share, with individual sales ranging from $10.19 to $11.30.
• All reported exercises and sales were conducted pursuant to a Rule 10b5-1 trading plan adopted by Mr. Sun on August 18, 2025.
• Following these transactions, Mr. Sun directly beneficially owns 1,472,306 shares of common stock, which includes 1,411,769 restricted stock units.
• Additionally, 274,275 shares are indirectly beneficially owned through the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST.

Sentiment

Score: 5

Explanation: The sentiment is neutral. While a large insider sale can sometimes be viewed negatively, the execution under a pre-arranged Rule 10b5-1 trading plan mitigates concerns about opportunistic selling. It represents a planned monetization of vested equity by the CEO.

Positives

• The CEO successfully monetized a significant portion of vested stock options, realizing over $10.5 million from the sale of 1 million shares.
• The transactions were executed under a pre-arranged Rule 10b5-1 trading plan, indicating a planned and non-opportunistic sale.

Negatives

• A large insider sale, even if pre-planned, can sometimes be perceived negatively by the market, potentially signaling a lack of confidence, although the 10b5-1 plan mitigates this concern.

Future Outlook

NA

Industry Context

This Form 4 filing details routine insider transactions by a key executive, which is a common occurrence in publicly traded companies. It reflects a planned monetization event for vested equity rather than a direct commentary on broader industry trends or competitive landscape.

Corporate Governance

Related Party Transactions

• Indirect beneficial ownership of 274,275 shares is held through the KANG & CECILLIA SUN FAMILY REVOCABLE TRUST, for which the reporting person and his spouse are co-trustees.

Stakeholder Impact

• Shareholders may react to the significant insider sale, though the pre-planned nature under a 10b5-1 plan typically reduces negative market interpretation compared to unplanned sales.
• The company's compliance and legal teams benefit from the Power of Attorney, which streamlines the executive's SEC filing process.

Key Dates

Recommendation

The filing reports a significant insider sale by the CEO, which can sometimes signal a lack of confidence. However, the transaction was executed under a pre-arranged Rule 10b5-1 trading plan, adopted months prior, which suggests it was not based on immediate, non-public information. The CEO still retains a substantial beneficial ownership, including restricted stock units. Without additional context on the company's performance or strategic direction, this filing alone does not warrant a change from a 'hold' position, as it represents a planned monetization event rather than an urgent divestment.

Keywords

Amprius Technologies, AMPX, Kang Sun, Insider Trading, Form 4, Stock Options, Share Sale, CEO, 10b5-1 Plan, Battery Technology