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Polaryx Therapeutics, Inc. received a Schedule 13D reporting that a group led by Mstone entities and Alex Keun Mo Yang beneficially owns 22,744,796 shares of common stock, or 48.0%, based on 47,343,297 shares outstanding as of January 12, 2026.
The group consists of Mstone Partners Healthcare Limited, MBstone Biotech Flagship Limited, Mstone Pediaorphan Singapore I Pte. Limited and Mr. Yang. Mstone holds 22,452,954 shares (47.4%), MBstone 183,560 shares (0.4%) and Mstone Singapore 108,282 shares (0.2%).
The aggregate purchase price for the currently owned shares is $3,000,513, funded from the reporting persons’ general working capital. Mr. Yang is Chief Executive Officer of Polaryx and has voting power over the shares held by the three Mstone entities, though he disclaims beneficial ownership outside Section 13(d) purposes. The group states it has no present specific plans for corporate actions but may reconsider its position over time.