Sirenia Capital Management LP Discloses New 7.9% Stake in Alto Neuroscience, Inc. (ANRO)

Sirenia Capital Management LP and its managing member, Alex Silverstein, filed a Schedule 13G on May 15, 2026, reporting a new 7.9% stake in Alto Neuroscience, Inc. (ANRO). The reporting persons beneficially own 2,591,587 shares of Common Stock, which includes 787,043 shares issuable upon the exercise of warrants held by SILV Fund, Ltd., an investment fund managed by Sirenia. This filing marks a significant increase from a previous ownership of 0.0%. The calculation of the ownership percentage is based on 31,945,516 shares outstanding as of March 16, 2026, as reported in the issuer's definitive proxy statement. The securities were acquired in the ordinary course of business and not for the purpose of changing or influencing the control of the issuer. Sirenia Capital Management LP and Alex Silverstein share voting and dispositive power over the reported shares. The principal business office for the reporting persons is located in Miami Beach, Florida.