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Filing
SCHEDULE 13D
SCHEDULE 13D0001213900-26-012759·Mstone Partners Healthcare Ltd
Schedule 13D ownership disclosure
POLARYX THERAPEUTICS INC
Common stock, par value $0.0001 per share ("Common Stock") · CUSIP: 73110F100
Event date: 2026-01-29
Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.
- Filing-level shares
- Unavailable
- Percent of class
- Unavailable
- Mstone Partners Healthcare LimitedReported CIK 0002104809
Shares: 22,452,954.00 · Class: 47.4%
- MBstone Biotech Flagship Limited
Shares: 183,560.00 · Class: 0.4%
- Mstone Pediaorphan Singapore I Pte. Limited
Shares: 108,282.00 · Class: 0.2%
- Alex Keun Mo YangReported CIK 0002103399
Shares: 22,744,796.00 · Class: 48.0%
Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.
Source: SEC EDGAR filingFiling metadata
- Accession number
- 0001213900-26-012759
- Form type
- SCHEDULE 13D
- Filer
- Mstone Partners Healthcare Ltd
- CIK
- CIK 2104809
- Filed
- Feb 05, 2026
- Reporting period
- Jan 29, 2026
- Description
- Schedule 13D beneficial ownership