Form 4: Amprius Director Sun Kang Boosts Stake with RSU Grant

Amprius Technologies Director and 10% owner Kang Sun acquired 6,250 restricted stock units, increasing beneficial ownership to 1,348,650 shares.

Summary

• Director and 10% owner Kang Sun of Amprius Technologies, Inc. acquired 6,250 restricted stock units (RSUs).
• Each restricted stock unit represents the right to receive one share of the issuer's common stock.
• The transaction occurred on May 5, 2026, and was made pursuant to a Rule 10b5-1 plan.
• Following this acquisition, Kang Sun beneficially owns 1,348,650 shares, which includes 1,165,635 restricted stock units.
• The newly acquired RSUs will vest 1/8th on May 20, 2026, and quarterly thereafter on August 20, November 20, February 20, and May 20, until fully vested on February 20, 2028, subject to continued service.

Sentiment

Score: 7

Explanation: StockSavvy.ai views this as a moderately positive signal, as an insider and significant owner is increasing their stake, suggesting confidence in the company's future, albeit through a compensation grant rather than an open market purchase.

Positives

• An insider, who is also a 10% owner, increasing their stake through an RSU grant can signal confidence in the company's future performance.
• The transaction was made under a Rule 10b5-1 plan, indicating a pre-planned acquisition strategy.

Risks

• The value of the restricted stock units is contingent on the future stock price of Amprius Technologies, Inc.
• Vesting is subject to continued service, meaning the reporting person must remain with the company to receive the shares.

Future Outlook

The vesting schedule for the restricted stock units extends until February 20, 2028, indicating a long-term incentive for the director.

Industry Context

StockSavvy.ai notes that equity compensation, particularly restricted stock units, is a common practice in the technology sector, including advanced battery companies like Amprius Technologies, to align management and director incentives with long-term shareholder value. The grant to a 10% owner reinforces commitment.

Comparison to Industry Standards

• The grant of restricted stock units to directors is a standard compensation practice across many industries, including high-growth technology and manufacturing companies.
• Companies such as QuantumScape (QS) and Solid Power (SLDP), also in the advanced battery space, frequently utilize RSU grants as part of their executive and director compensation packages to retain talent and incentivize performance.
• The vesting schedule, extending over approximately two years, is typical for long-term incentive plans designed to encourage sustained performance and commitment.

Stakeholder Impact

• Shareholders: The increase in insider ownership may be viewed positively as it aligns the director's interests with long-term shareholder value.
• Employees: The use of equity compensation like RSUs is a common incentive mechanism, potentially signaling a stable compensation strategy.

Next Steps

• Continued vesting of the restricted stock units on a quarterly basis until February 20, 2028.

Key Dates

Recommendation

While the insider acquisition of RSUs by a director and 10% owner is a positive signal of confidence, it is a compensation grant rather than an open market purchase. This type of transaction, while aligning interests, does not typically warrant a "buy" recommendation on its own. It reinforces a "hold" position for existing investors, indicating stability and continued insider commitment.

Keywords

Amprius Technologies, AMPX, Form 4, Insider Trading, Restricted Stock Units, RSU, Director, 10% Owner, Equity Compensation, Stock Grant, Rule 10b5-1