NovaBridge (NBP) Chief BD Officer Receives RSU Vesting — 147,553 ADSs

What Happened

• Cao Sean Wuxiong, Chief Business Development Officer of NovaBridge Biosciences (NBP), had restricted stock units (RSUs) convert/vest on September 3, 2026 (reported on Form 4 filed Sep 8, 2026). The filing shows conversion/exercise of derivatives (code M) resulting in a total of 147,553 American Depositary Shares (ADSs), which equal 339,372 ordinary shares using the issuer’s ADS ratio (10 ADSs = 23 ordinary shares).
• The vesting broke down as: 102,233 ADSs (235,136 ordinary shares) from the Sep 3, 2025 RSU grant, and 45,320 ADSs (104,236 ordinary shares) from the June 22, 2026 RSU grant. Portions of the vested ADSs were surrendered/ disposed at $0 to cover withholding/tax obligations (reported as dispositions with $0 proceeds), so there were no cash proceeds to the reporting person.

Key Details

• Transaction date: September 3, 2026; Form 4 filed: September 8, 2026 (reporting period date: 2026-09-03).
• Gross vested: 147,553 ADSs (equals 339,372 ordinary shares). Reported disposals for tax withholding: 102,233 ADSs and 45,320 ADSs (both $0).
• Price/proceeds: Disposed ADSs reported at $0 — indicates shares were surrendered/withheld (tax withholding), not a cash sale.
• Relevant footnotes: 10 ADSs = 23 ordinary shares (F1); F2/F4 identify the ADS amounts reported; F3–F6 describe the RSU grants and standard multi-year vesting schedules (grants dated Sep 3, 2025 and Jun 22, 2026 with 1/4 vesting on Sep 3, 2026 and remaining vesting quarterly).
• Shares owned after transaction: not disclosed in the excerpt of this filing.

Context

• This filing reflects RSU vesting/conversion (an award becoming shares), not an open-market purchase — typically a compensation event rather than a direct bullish purchase by the insider.
• The $0 disposals are consistent with share withholding to satisfy tax obligations (a common practice), not donations or market sales.
• No indication in this filing that the insider received cash proceeds; the activity should be read as compensation vesting and tax-related withholding rather than a signal of buying or selling intent.