Item 4 is hereby amended and supplemented as follows: As previously disclosed, on February 28, 2025, the Issuer (which was formerly known as Helix Acquisition Corp. II, "Helix") entered into a Business Combination Agreement (as amended on June 20, 2025, the "Business Combination Agreement") with TheRas, Inc. (d/b/a BridgeBio Oncology Therapeutics, "Legacy BBOT"), and Helix II Merger Sub, Inc. ("Merger Sub"), pursuant to which, subject to the satisfaction or waiver of certain conditions set forth therein, the Domestication of Helix as a Delaware corporation would occur, followed by the Merger of Merger Sub with and into Legacy BBOT. Prior to the Business Combination, Ms. Chen was the Chairwoman and Chief Executive Officer of the Issuer, a shareholder of the Issuer, and a shareholder of Legacy BBOT. On August 11, 2025, the Domestication occurred. Immediately prior to the Domestication, Sponsor forfeited 307,874 Sponsor Forfeited Shares and subsequently converted an aggregate of 4,172,126 Helix Class B ordinary shares held by it, in each case pursuant to the terms of the Support Agreement. Upon the completion of the Domestication, each Helix Class A ordinary share held by the Reporting Persons automatically converted into one share of Common Stock of the Issuer, on a one-for-one basis. On August 11, 2025, the PIPE Investments closed and the Reporting Persons purchased an aggregate of 6,998,031 shares of Common Stock at a price per share of $10.7173, representing the redemption price of the Helix public shares pursuant to the terms of the Subscription Agreement. Additionally, on August 11, 2025, the Merger occurred. Immediately prior to the Merger, the Sponsor forfeited 152,940 shares of Common Stock pursuant to the terms of the Sponsor Support Agreement. Upon the completion of the Domestication, each share of capital stock of Legacy BBOT owned by the Reporting Persons was converted into shares of Common Stock of the Issuer. Also on August 11, 2025, in connection with the Closing and as contemplated by the Business Combination Agreement, the Reporting Persons entered into the Lock-Up Agreement with the Issuer, pursuant to which the shares of Common Stock beneficially owned by the Reporting Persons (other than the shares of Common Stock purchased in the PIPE Investment) will be subject to transfer restrictions for the period beginning immediately following the Closing Date and ending one year after the later of (i) the filing of the Form 10 Information (as defined in Rule 144(i)(3) of the Securities Act) with the SEC and (ii) the Closing Date. Also on August 11, 2025, in connection with the closing and as contemplated by the Business Combination Agreement, the Issuer entered into the Registration Rights Agreement with certain shareholders, including the Reporting Persons, pursuant to which the Issuer agreed to register for resale certain shares of Common Stock held by the parties thereto from time to time. As of the Closing, Ms. Chen beneficially owned 17,878,594 shares of Common Stock, which includes (i) 4,528,186 shares of Common Stock owned directly by the Sponsor, (ii) 2,187,536 shares of Common Stock owned directly by Fund III, (iii) 1,905,046 shares of Common Stock owned directly by Fund IV, (iv) 3,305,470 shares of Common Stock owned directly by Fund V, and (v) 5,952,356 shares of Common Stock owned directly by Master Fund. The foregoing descriptions of the Business Combination Agreement, Support Agreement, Subscription Agreement, Lock-Up Agreement, and Registration Rights Agreement are qualified in their entirety by reference to such agreements, which are filed as exhibits 7 through 11 to this Schedule 13D. Plans or Proposals Ms. Chen is member of the board of directors ("Board") of the Issuer. In this capacity, she may communicate with other members of management, other members of the Board, and/or other stockholders from time to time with respect to operational, strategic, financial or governance matters or otherwise work with management and the Board with a view to maximizing stockholder value. Such discussions and actions may be preliminary and exploratory in nature, and may not rise to the level of a plan or proposal. The Reporting Persons have acquired the shares reported herein for investment purposes. The Reporting Persons review and intend to continue to review, on an ongoing and continued basis, their investments in the Issuer. The Reporting Persons may seek to acquire additional securities of the Issuer (which may include rights or securities exercisable or convertible into securities of the Issuer) from time to time, and/or may seek to sell or otherwise dispose of some or all of the Issuer's securities from time to time, in each case, in open market or private transactions, block sales or otherwise, including in connection with extraordinary corporate transactions, such as a tender offer, merger or consolidation that would result in the de-listing of the Common Stock, or through in-kind distributions. The Reporting Persons expect to continue to actively evaluate such transactions, and to take other actions intended to position the Reporting Persons to opportunistically engage in one or more of such transactions in the future. Any transactions that the Reporting Persons may pursue may be made at any time and from time to time without prior notice and will depend upon a variety of factors, including, without limitation, current and anticipated future trading prices of the securities of the Issuer, the financial condition, results of operations and prospects of the Issuer, general economic, financial market and industry conditions, other investment and business opportunities available to the Reporting Persons, tax considerations and other factors considered relevant by the Reporting Persons. Except as described in this Amendment, the Reporting Persons do not have any present plans or proposals that relate to or would result in any of the actions described in Item 4 of Schedule 13D, although the Reporting Persons, at any time and from time to time, may review, reconsider and change such position and/or change their purpose and/or develop such plans and may seek to influence management of the Issuer or the Board with respect to the business and affairs of the Issuer and may from time to time consider pursuing or proposing such matters with advisors, the Issuer or other persons.