Form 4: ADTRAN Holdings Executive Trades Shares

ADTRAN Holdings Chief Technology Officer Christoph Glingener executed a series of stock transactions on May 7th and 8th, 2026, under a Rule 10b5-1 trading plan.

Summary

• Christoph Glingener, Chief Technology Officer at ADTRAN Holdings, Inc., reported several transactions involving common stock and stock options on May 7th and May 8th, 2026.
• These transactions were conducted under a Rule 10b5-1 trading plan adopted on December 12, 2025.
• On May 7th, 2026, Glingener acquired 41,220 shares at $7.01 per share and sold 41,220 shares at a weighted average price between $14.355 and $15.69.
• Also on May 7th, 2026, Glingener acquired 84,895 shares at $12.17 per share and sold 84,895 shares at a weighted average price between $15.00 and $15.69.
• On May 8th, 2026, Glingener acquired an additional 22,277 shares at $12.17 per share and sold these 22,277 shares at $15.00 per share.
• Following these transactions, Glingener beneficially owns 46,645 shares of common stock directly.
• The filing also details the status of various stock options, including those that vested and became exercisable, and one option that vests on May 15, 2026.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a neutral filing. While the executive is selling shares, it's under a pre-established plan, and the acquisition of shares at lower prices and exercise of options suggest ongoing equity participation.

Positives

• The executive executed trades under a pre-arranged Rule 10b5-1 plan, indicating adherence to insider trading regulations.
• Multiple stock option grants were exercised and vested, suggesting potential for future equity value realization.
• The weighted average sale prices ($14.355-$15.69 and $15.00-$15.69) are significantly higher than the acquisition prices for some of the shares ($7.01 and $12.17).

Negatives

• The executive sold a substantial number of shares (41,220 and 84,895 on May 7th, and 22,277 on May 8th), which could be interpreted as a lack of confidence in near-term stock appreciation.
• The weighted average sale prices for some transactions were close to the exercise price of certain options, potentially limiting upside for those specific option grants.

Risks

• The sale of a large number of shares by a key executive could be perceived negatively by the market, potentially impacting share price.
• The Rule 10b5-1 plan is subject to market conditions and the company's performance, which could affect the execution and outcomes of future trades.

Future Outlook

The filing does not contain explicit forward-looking statements or guidance. However, the existence and execution of the Rule 10b5-1 plan suggest a structured approach to managing executive equity holdings over time.

Management Comments

• The transactions reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 12, 2025.
• The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within this range.

Industry Context

StockSavvy.ai notes that Form 4 filings are routine for public companies and provide transparency into executive stock transactions. The use of Rule 10b5-1 plans is a common strategy for executives to diversify holdings or manage liquidity while adhering to insider trading regulations. The specific prices and volumes traded will be closely watched by investors for any signals about management's confidence in the company's future performance.

Stakeholder Impact

• Shareholders: May interpret the executive's stock sales as a potential negative signal, although the Rule 10b5-1 plan mitigates concerns about opportunistic trading.
• Employees: The executive's equity transactions may influence employee sentiment regarding the company's stock performance.
• Creditors: Unlikely to be directly impacted by this insider stock transaction.

Next Steps

• The reporting person will continue to operate under the Rule 10b5-1 trading plan.
• The company may be required to provide further details on specific sale prices upon request from regulatory bodies or security holders.

Key Dates

Keywords

ADTRAN Holdings, Form 4, Insider Trading, Stock Options, Rule 10b5-1, Christoph Glingener, Beneficial Ownership, Common Stock, SEC Filing, Executive Transactions