Polaryx Therapeutics (PLYX) CEO Yang bought 88,453 shares for $360K at $4.07
Insider transactions reported
Yang Alex Keun Mo (Chief Executive Officer at Polaryx Therapeutics Inc., PLYX) reported that they bought 88,453 shares for $360K at $4.07 on May 27, 2026. After these transactions the filing shows 24,233,249 shares held indirectly (By Mstone Partners Healthcare Limited).
- Reporting person
- Yang Alex Keun Mo
- Role
- Chief Executive Officer
| Date | Type | Security | Shares | Price | Value | Held after |
|---|---|---|---|---|---|---|
| May 27, 2026 | Open-market purchase (P) | Common Stock1, 2 | +88,453 | $4.07 | $360K | 24,233,249 indirect |
Holdings before and after
- Common Stock: 24,144,796 to 24,233,249 indirect, By Mstone Partners Healthcare Limited
Footnotes from the filing
- 1. As disclosed in the Issuer's Form 8-K filed with the Securities and Exchange Commission on May 28, 2026, MStone Partners Healthcare Limited ( Mstone ) purchased 88,453 shares of common stock in a private placement transaction, for gross proceeds to the Issuer of $360,000.
- 2. Alex Keun Mo Yang is the founder and Chief Executive Officer of Mstone. Mr. Yang disclaims beneficial ownership over any of the reported securities, except to the extent of his pecuniary interest therein.
Transaction codes in this filing
- Open-market purchase:
- Code P marks a purchase in the open market or a private deal. The insider paid for these securities.
FAQ
What did Yang report in this PLYX Form 4?
Yang Alex Keun Mo (Chief Executive Officer at Polaryx Therapeutics Inc., PLYX) reported that they bought 88,453 shares for $360K at $4.07 on May 27, 2026. After these transactions the filing shows 24,233,249 shares held indirectly (By Mstone Partners Healthcare Limited).
How many PLYX shares does Yang hold after this filing?
The filing shows 24,233,249 shares held indirectly (By Mstone Partners Healthcare Limited) after the reported transactions. Form 4 reports only the positions it lists, so this may not be every holding.
What does transaction code P mean on an SEC Form 4?
Code P marks a purchase in the open market or a private deal. The insider paid for these securities.
Historical context for PLYX
Across the 13 sessions after earlier PLYX headlines, the stock closed higher 4 times and lower 9 times, with a median move of 7.5% in either direction. This shows timing only: many things move a stock in a session, and these figures do not show that any headline caused a move.
| Session | Earlier headline | PLYX | SPY |
|---|---|---|---|
| May 28, 2026 | Polaryx Therapeutics Announces Closing of $10 Million Private Placement Equity Financing to Support Launch of SOTERIA Phase 2 Basket Trial | +21.5% | +0.6% |
| May 14, 2026 | Polaryx Therapeutics Receives GHP Magazine's Healthcare & Pharmaceuticals Awards | +1.3% | +0.8% |
| Apr 23, 2026 | Polaryx Therapeutics to Participate in National Tay-Sachs & Allied Diseases Association Annual Family Conference | -3.4% | -0.4% |
| Apr 21, 2026 | Polaryx Therapeutics Receives U.S. FDA Fast Track Designations for All Four Indications to be Evaluated in the SOTERIA Basket Trial | -7.5% | -0.7% |
| Apr 15, 2026 | Polaryx Therapeutics Recognized with Pinnacle Award for Excellence in Pediatric Care | -0.2% | +0.8% |
| Apr 1, 2026 | Polaryx Therapeutics To Participate In The 25th Annual Needham Virtual Healthcare Conference | +0.5% | +0.8% |
Earlier insider filings at PLYX
Keep researching PLYX
- PLYX insider tradesEvery buy and sale reported by Polaryx Therapeutics Inc. officers, directors and large holders.
- What is Insider buying?Purchases of a company's stock by its officers, directors or 10% holders, reported to the SEC on Form 4 and watched as a signal of insider confidence.
- How to track insider buyingInsider buying is tracked through SEC Form 4 code P filings. Learn how to find open-market purchases, spot cluster buys and judge which insider trades carry real signal.
- Insider trading trackerThe latest insider buys and sales across every stock.
- PLYX financial statementsRevenue, profit, cash flow and balance sheet from Polaryx Therapeutics Inc.'s SEC filings.
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- Sector
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- Biotechnology: Pharmaceutical Preparations
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