Yang Alex Keun Mo 4

What Happened Alex Keun Mo Yang, founder and CEO of Polaryx Therapeutics, is associated with a purchase of 88,453 shares at $4.07 per share (total ≈ $360,004) on May 27, 2026. The purchase was made in a private placement by MStone Partners Healthcare Limited (Mstone). The transaction is reported as a purchase (code P).

Key Details

• Transaction date: May 27, 2026; Form 4 filed May 28, 2026 (timely filing).
• Price: $4.07 per share; Shares purchased: 88,453; Total value ≈ $360,004 (gross proceeds to issuer reported as $360,000).
• Purchaser: MStone Partners Healthcare Limited (private placement), not an open-market trade.
• Footnote: MStone purchased the shares in a private placement for gross proceeds to the issuer of $360,000.
• Footnote: Alex Keun Mo Yang is the founder and CEO of MStone and disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest.
• Shares owned after transaction: Not specified in the filing.

Context This was a private placement transaction (institutional/private buyer) rather than an open-market purchase. The filing notes the buyer is MStone and that Mr. Yang disclaims beneficial ownership except for any pecuniary interest, which means the filing reflects the firm's purchase rather than a clear statement of personal holdings. No options, awards, gifts, or tax-withholding events were reported.