Yenyou Zheng reports an option exercise and a stock award

Filing context

• Quantities and prices are shown in the units filed. No trade value is inferred from their product.
• Zheng Yenyou: Director.
• F1: All share and RSU amounts reported in this Form 4 have been adjusted to give effect to the Issuer's 1-for-5 reverse stock split effective February 20, 2026 (the "2026 Reverse Split"). On a pre-2026 Reverse Split basis, (i) the RSUs granted on October 16, 2025, and the shares of common stock issued upon settlement of such RSUs on October 16, 2026, each covered 30,000 RSUs or shares, as applicable, which equals 6,000 RSUs or shares on a post-2026 Reverse Split basis; (ii) the RSUs settled on May 28, 2025, and the shares of common stock issued upon such settlement, each covered 858 RSUs or shares, as applicable, which equals 172 RSUs or shares on a post-2026 Reverse Split basis; and (iii) the RSUs settled on June 9, 2024, and the shares of common stock issued upon such settlement, each covered 25 RSUs or shares, as applicable, which equals 5 RSUs or shares on a post-2026 Reverse Split basis.
• F2: The RSUs granted on May 28, 2024 were reported on the Reporting Person's Form 4 filed on May 30, 2024 as 30,000 RSUs, an amount that did not give effect to the Issuer's 1-for-35 reverse stock split effective May 30, 2024 (the "2024 Reverse Split"). After giving effect to each of the 2024 Reverse Split and the 2026 Reverse Split, such 30,000 RSUs equal 172 RSUs. The RSUs granted on June 9, 2023 were reported on the Reporting Person's Form 4 filed on June 13, 2023 as 858 RSUs; after giving effect to each of the 2024 Reverse Split and the 2026 Reverse Split, such 858 RSUs equal 5 RSUs. Fractional shares and RSUs resulting from the 2024 Reverse Split and the 2026 Reverse Split were rounded up to the nearest whole share or RSU, as applicable.
• F3: Each RSU represents a contingent right to receive one share of the Issuer's common stock upon vesting. The RSUs granted on June 9, 2023 vested in full on June 9, 2024, the first anniversary of the grant date. The RSUs granted on May 28, 2024 vested in full on May 28, 2025, the first anniversary of the grant date, and the RSUs granted on October 16, 2025 vested in full on October 16, 2026, the first anniversary of the grant date, in each case subject to the Reporting Person's continued service through the applicable vesting date. The RSUs have no expiration date.
• F4: The Reporting Person's Form 4 reporting the RSUs granted on March 31, 2026, filed on April 9, 2026, did not include (i) the 6,000 RSUs (on a post-2026 Reverse Split basis) granted on October 16, 2025, which were then held by the Reporting Person and unvested, or (ii) the shares of common stock held by the Reporting Person, including shares acquired upon settlement of RSUs on May 21, 2022, May 11, 2023, June 9, 2024 and May 28, 2025. The holdings reported in this Form 4 correct the holdings previously reported. The 140,000 RSUs granted on March 31, 2026, as reported on such prior Form 4, are not affected by the transactions reported herein and continue to be held by the Reporting Person. The Reporting Person currently beneficially owns 140,000 RSUs.