X0508 4 2026-02-09 1 0001733294 Generation Bio Co. GBIO 0001042021 JONAS JEFFREY M C/O GENERATION BIO CO. 301 BINNEY ST, SUITE 401 CAMBRIDGE MA 02142 1 0 0 0 0 Stock Option (right to buy) 3.874 2026-02-09 4 D 0 3000 D Common Stock 3000 0 D Stock Option (right to buy) 45.924 2026-02-09 4 D 0 4246 D Common Stock 4246 0 D Stock Option (right to buy) 190.00 2026-02-09 4 D 0 5200 D Common Stock 5200 0 D Stock Option (right to buy) 265.90 2026-02-09 4 D 0 1500 D Common Stock 1500 0 D Stock Option (right to buy) 61.90 2026-02-09 4 D 0 1920 D Common Stock 1920 0 D Stock Option (right to buy) 48.30 2026-02-09 4 D 0 2500 D Common Stock 2500 0 D Stock Option (right to buy) 33.20 2026-02-09 4 D 0 6000 D Common Stock 6000 0 D Pursuant to the terms of that certain Agreement and Plan of Merger (the "Merger Agreement"), by and among Generation Bio. Co. (the "Issuer"), XOMA Royalty Corporation ("Parent") and Parent's wholly-owned subsidiary, XRA 7 Corp. ("Merger Sub"), dated as of December 15, 2025, Merger Sub merged with and into the Issuer, effective as of February 9, 2026 (the "Effective Time"), with the Issuer continuing as the surviving corporation and a wholly owned subsidiary of Parent. Pursuant to the terms of the Merger Agreement, effective as of immediately prior to the Effective Time, each option to purchase shares of common stock, par value $0.0001 per share, of the Issuer (the "Common Stock") that was outstanding and unexercised as of immediately prior to the Effective Time and had an exercise price per share that was less than $4.2913 (the "Cash Amount") (each such option, an "In-The-Money Option"), became fully vested and was automatically cancelled and converted into the right to receive an amount in cash, without interest, equal to the product obtained by multiplying (x) the excess of the Cash Amount over the exercise price per share of Common Stock underlying such In-the-Money Option at the Effective Time by (y) the number of shares of Common Stock underlying such In-the-Money Option at the Effective Time. Pursuant to the terms of the Merger Agreement, effective as of immediately prior to the Effective Time, each option to purchase shares of Common Stock that was outstanding and unexercised as of immediately prior to the Effective Time and had an exercise price per share that was equal to or greater than the Cash Amount was automatically cancelled for no consideration. /s/ Shawna-Gay White, Attorney-in-Fact 2026-02-09