Form 4 Filing for Sun Jian David

This filing details transactions made by Sun Jian David, a director at 111, Inc. The transactions primarily involve Restrictive Stock Units (RSUs) for Class A ordinary shares. On September 12, 2018, 18,366 RSUs were acquired. Subsequent acquisitions of RSUs occurred on May 11, 2026 (378,737 RSUs) and May 12, 2026 (413,168 RSUs). The filing also reports the sale of 29,280 RSUs on May 26, 2026, and 70,440 RSUs on May 27, 2026, to cover tax withholding obligations. All reported RSUs have fully vested as of the filing date. The post-transaction number of shares owned following these transactions are also provided.