X0202 SCHEDULE 13G/A 0000935836-26-000371 0001792126 XXXXXXXX LIVE 1 Common Stock, par value $0.0001 07/31/2026 0001566044 Yarrow Bioscience, Inc. 92941V407 470 JAMES STREET, SUITE 007 NEW HAVEN CT 06513 Rule 13d-1(b) Rule 13d-1(c) Logos Global Management LP b DE 0.00 286308.00 0.00 286308.00 286308.00 N 10.7 IA PN The shares reported herein exclude prefunded warrants to acquire 2,201,030 shares of Common Stock, which are subject to a 9.99% beneficial ownership limitation. The percentage is calculated based on 2,669,788 shares of Common Stock outstanding on July 29, 2026, as reported in the Form 8-K filed by the Issuer on July 30, 2026. Logos Global Management GP LLC b DE 0.00 286308.00 0.00 286308.00 286308.00 N 10.7 HC OO The shares reported herein exclude prefunded warrants to acquire 2,201,030 shares of Common Stock, which are subject to a 9.99% beneficial ownership limitation. The percentage is calculated based on 2,669,788 shares of Common Stock outstanding on July 29, 2026, as reported in the Form 8-K filed by the Issuer on July 30, 2026. Logos Global Master Fund LP b E9 0.00 176678.00 0.00 176678.00 176678.00 N 6.6 PN The percentage is calculated based on 2,669,788 shares of Common Stock outstanding on July 29, 2026, as reported in the Form 8-K filed by the Issuer on July 30, 2026. Logos GP LLC b DE 0.00 176678.00 0.00 176678.00 176678.00 N 6.6 HC OO The percentage is calculated based on 2,669,788 shares of Common Stock outstanding on July 29, 2026, as reported in the Form 8-K filed by the Issuer on July 30, 2026. Logos Opportunities Fund V LP b DE 0.00 109630.00 0.00 109630.00 109630.00 N 4.1 PN The percentage is calculated based on 2,669,788 shares of Common Stock outstanding on July 29, 2026, as reported in the Form 8-K filed by the Issuer on July 30, 2026. Logos Opportunities V GP LLC b DE 0.00 109630.00 0.00 109630.00 109630.00 N 4.1 HC OO The percentage is calculated based on 2,669,788 shares of Common Stock outstanding on July 29, 2026, as reported in the Form 8-K filed by the Issuer on July 30, 2026. Arsani William b X1 0.00 286308.00 0.00 286308.00 286308.00 N 10.7 HC IN The shares reported herein exclude prefunded warrants to acquire 2,201,030 shares of Common Stock, which are subject to a 9.99% beneficial ownership limitation. The percentage is calculated based on 2,669,788 shares of Common Stock outstanding on July 29, 2026, as reported in the Form 8-K filed by the Issuer on July 30, 2026. Graham Walmsley b X1 0.00 109630.00 0.00 109630.00 109630.00 N 4.1 HC IN The percentage is calculated based on 2,669,788 shares of Common Stock outstanding on July 29, 2026, as reported in the Form 8-K filed by the Issuer on July 30, 2026. Yarrow Bioscience, Inc. 470 James Street, Suite 007, New Haven, CT 06513 Logos Global Management LP ("Logos Global") Logos Global Management GP LLC ("Logos Global GP") Logos Global Master Fund LP ("Global Fund") Logos GP LLC ("Logos GP") Logos Opportunities Fund V LP ("Opp V") Logos Opportunities V GP LLC ("Opp V GP") Arsani William Graham Walmsley Logos Global is a registered investment adviser and holds for the benefit of investment funds, including Global Fund and Opp V, in the ordinary course of business. Logos Global GP is the general partner of Logos Global. Logos GP is the general partner of Global Fund. Opp V GP is the general partner of Opp V. Dr. William is a control person of Logos Global, Logos Global GP and Logos GP. Dr. William and Dr. Walmsley are the control persons of Opp V GP. The reporting persons are filing this statement jointly but not as members of a group, and they expressly disclaim membership in a group. Each reporting person disclaims beneficial ownership of Common Stock except to the extent of that person's pecuniary interest therein. In addition, the filing of this Schedule 13G on behalf of each of the Global Fund or Opp Fund V should not be construed as an admission that it is, and it disclaims that it is, a beneficial owner, as defined in Rule 13d-3 under the Act, of any Common Stock covered by this Schedule 13G. One Letterman Drive, Building C, Suite C3-350, San Francisco, California 94129 See Item 4 of the cover sheet for each reporting person. N IA HC Logos Global: 286,308 Logos Global GP: 286,308 Global Fund: 176,678 Logos GP: 176,678 Opp V: 109,630 Opp V GP: 109,630 Arsani William: 286,308 Graham Walmsley: 109,630 Logos Global: 10.7% Logos Global GP: 10.7% Global Fund: 6.6% Logos GP: 6.6% Opp V: 4.1% Opp V GP: 4.1% Arsani William: 10.7% Graham Walmsley: 4.1% Logos Global: 0 Logos Global GP: 0 Global Fund: 0 Logos GP: 0 Opp V: 0 Opp V GP: 0 Graham Walmsley: 0 Arsani William: 0 Logos Global: 286,308 Logos Global GP: 286,308 Global Fund: 176,678 Logos GP: 176,678 Opp V: 109,630 Opp V GP: 109,630 Arsani William: 286,308 Graham Walmsley: 109,630 Logos Global: 0 Logos Global GP: 0 Global Fund: 0 Logos GP: 0 Arsani William: 0 Logos Global: 286,308 Logos Global GP: 286,308 Global Fund: 176,678 Logos GP: 176,678 Opp V: 109,630 Opp V GP: 109,630 Arsani William: 286,308 Graham Walmsley: 109,630 Y N Each of Global Fund and Opp V hold the Common Stock for the benefit of each of its respective investors and has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Common Stock. Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. EXHIBIT 99.1 AGREEMENT REGARDING JOINT FILING OF STATEMENT ON SCHEDULE 13D OR 13G Logos Global Management LP /s/ Arsani William 08/07/2026 Logos Global Management GP LLC /s/ Arsani William 08/07/2026 Logos Global Master Fund LP /s/ Arsani William 08/07/2026 Logos GP LLC /s/ Arsani William 08/07/2026 Logos Opportunities Fund V LP /s/ Graham Walmsley 08/07/2026 Logos Opportunities V GP LLC /s/ Graham Walmsley 08/07/2026 Arsani William /s/ Arsani William 08/07/2026 Graham Walmsley /s/ Graham Walmsley 08/07/2026