A Form 4 filed on August 13, 2026 with the U.S. Securities and Exchange Commission reports that William Lis, a director of Zai Lab Ltd (NASDAQ:ZLAB), sold 8,506 American Depositary Shares on August 12, 2026 under a pre-established Rule 10b5-1 trading plan.

Key Highlights

  • Shares sold: William Lis disposed of 8,506 American Depositary Shares (ADS) of Zai Lab Ltd on August 12, 2026.
  • Sale price: The transaction was executed at $25 per ADS, according to the filing.
  • Remaining ownership: Following the sale, Lis directly beneficially owns 41,931 ADS.
  • Trading plan: The sale was made pursuant to a Rule 10b5-1 trading plan adopted by Lis on September 10, 2025.
  • ADS structure: Each ADS represents ten ordinary shares of the issuer, and ADSs and ordinary shares are described in the filing as "fully fungible."
  • Transaction code: The filing records the transaction under code "S" (sale), reported as a direct disposition.

William Lis ADS Sale at Zai Lab: Transaction Details

According to the Form 4 filing, William Lis, identified as a director of Zai Lab Ltd, sold 8,506 American Depositary Shares on August 12, 2026 at a price of $25 per ADS. The filing notes that the transaction was effected pursuant to a Rule 10b5-1 trading plan that Lis adopted on September 10, 2025. Rule 10b5-1 plans allow insiders to establish pre-scheduled trading arrangements at a time when they are not in possession of material non-public information.

The filing discloses that following the reported transaction, Lis directly holds 41,931 ADS. No indirect holdings are reported in connection with this transaction. The filing also clarifies that each ADS represents ten ordinary shares of the issuer, and that the ADSs and ordinary shares are "fully fungible," with the reporting person electing to report holdings in terms of ADSs for purposes of this Form 4.

No derivative securities transactions are reported in Table II of the filing. The Form 4 was signed by Bruce Blefeld as attorney-in-fact on August 13, 2026, the same date it was filed with the SEC.

What Was Disclosed

The filing reports a single sale of 8,506 ADS by Zai Lab director William Lis on August 12, 2026 at $25 per share, made under a pre-adopted Rule 10b5-1 plan, leaving him with a direct beneficial ownership of 41,931 ADS.