Zai Lab Limited (NASDAQ:ZLAB) Chief Financial Officer Chen Yajing filed a Form 4 on August 21, 2026, disclosing the sale of 260 American Depositary Shares on August 19, 2026, pursuant to a pre-established Rule 10b5-1 trading plan.

Key Highlights

  • Transaction date: Chen Yajing disposed of 260 American Depositary Shares on August 19, 2026.
  • Sale price: The shares were sold at $27 per ADS, according to the filing.
  • Remaining ownership: Following the transaction, Chen Yajing directly beneficially owns 35,635 ADS.
  • 10b5-1 plan: The sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 9, 2025.
  • ADS structure: Each ADS represents ten Ordinary Shares of the issuer, and the filing notes that ADSs and Ordinary Shares are "fully fungible."

Zai Lab CFO Transaction Details and Plan Background

According to the filing, Chen Yajing, Chief Financial Officer of Zai Lab Limited, reported a disposition of 260 American Depositary Shares of NASDAQ:ZLAB on August 19, 2026. The transaction was coded "S" (sale) in Table I of the Form 4, with a reported price of $27 per ADS. The filing indicates the transaction was direct, with no indirect beneficial ownership reported for this security.

The filing discloses that the sale was carried out under a Rule 10b5-1 trading plan that Chen Yajing adopted on December 9, 2025. A checkbox on the form confirms the transaction was made pursuant to a contract, instruction, or written plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). Following the reported sale, the filing states Chen Yajing's direct beneficial ownership stands at 35,635 ADS.

The filing clarifies that each ADS represents ten Ordinary Shares of Zai Lab Limited, and that the company's ADSs and Ordinary Shares are described as "fully fungible." No derivative securities transactions were reported in Table II. The Form 4 was signed by Bruce Blefeld as Attorney-in-Fact on August 21, 2026.

What Was Disclosed

Zai Lab's CFO Chen Yajing disclosed the sale of 260 ADS at $27 each on August 19, 2026, under a pre-established 10b5-1 plan adopted in December 2025, leaving a remaining direct beneficial ownership of 35,635 ADS.