The Reporting Person beneficially owns an aggregate of 6,344,114 shares of Common Stock of the Issuer, consisting of (a) 788,559 shares of Common Stock that were issued to the Reporting Person at the closing of the Issuer's initial public offering (the "IPO") on January 12, 2026 upon the automatic conversion of (i) 2,500,000 shares of Series A-1 Redeemable Convertible Preferred Stock ("Series A Preferred") acquired prior to the IPO for an aggregate purchase price of $10.0 million and (ii) 500,000 shares of Series B Redeemable Convertible Preferred Stock ("Series B Preferred") acquired prior to the IPO for an aggregate purchase price of $2.0 million; and (b) 5,555,555 shares of Common Stock purchased by the Reporting Person in the IPO at the public offering price of $18.00 per share, for an aggregate purchase price of approximately $100.0 million. The funds used by the Reporting Person to acquire the Series A Preferred, the Series B Preferred and the Common Stock purchased in the IPO consisted of cash on hand.

Investors' Rights Agreement The Reporting Person and certain other stockholders of the Issuer have entered into a Third Amended and Restated Investors' Rights Agreement with the Issuer (the "Investors' Rights Agreement"), which provides such stockholders with customary registration rights under the Securities Act of 1933, including demand registration rights, piggyback registration rights and shelf registration rights. The Issuer is required to pay all expenses, subject to certain conditions and exceptions, relating to the exercise of such registration rights. The Investors' Rights Agreement also contains customary cross-indemnification provisions. The Reporting Person's registration rights will terminate upon the earlier of (i) the closing of certain deemed liquidation events, as defined in the Issuer's certificate of incorporation, (ii) when the Reporting Person beneficially owns (together with its "affiliates," as defined in Rule 144 under the Securities Act of 1933, as amended) less than 1% of the Issuer's outstanding capital stock and is able to sell all of its shares pursuant to Rule 144 or another similar exemption during a three-month period without registration and (iii) the third anniversary of the IPO. Lock-Up Agreement The Reporting Person has entered into a lock-up agreement pursuant to which the Reporting Person has agreed not to, among other things and subject to various exceptions, sell or transfer Common Stock or securities convertible into or exercisable or exchangeable for Common Stock for 180 days after January 8, 2026 without first obtaining the prior written consent of J.P. Morgan Securities LLC, BofA Securities, Inc., Leerink Partners LLC and TD Securities (USA) LLC on behalf of the underwriters. The foregoing descriptions of the Investors' Rights Agreement and the lock-up agreement do not purport to be complete and are qualified in their entirety by reference to the Investors' Rights Agreement and the form of lock-up agreement, listed as Exhibit 2.1 and Exhibit 2.2 hereto, respectively, and incorporated by reference herein.

Exhibit 2.1: Third Amended and Restated Investors' Rights Agreement, by and among the Issuer and certain of its stockholders, dated September 20, 2024 (Incorporated by reference to Exhibit 4.1 to the Issuer's Registration Statement on Form S-1 (SEC File No. 333-292283), filed with the Securities and Exchange Commission on January 7, 2026). Exhibit 2.2: Form of Lock-Up Agreement (Incorporated by reference to the Form of the Lock-Up Agreement attached as Exhibit D to the Form of the Underwriting Agreement filed as Exhibit 1.1 to the Issuer's Registration Statement on Form S-1 (SEC File No. 333-292283), filed with the Securities and Exchange Commission on January 7, 2026).