PLYXNasdaqPharmaceutical PreparationsFiscal year ends December 31
Polaryx Therapeutics, Inc.
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 13, 2026
$1.92+0.04 (+2.13%)
Close on Oct 19, 2026
- Market cap
- $92.69M
- P/E (TTM)
- –
- Dividend yield
- –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
4.4%
2M of 50M shares
Institutional holders
13
4 new, 5 sold out
Net institutional buying
-0M
In Q2 2026
Insider trades, 12 months
2 buys · 0 sales
Net bought $368.00K
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Alex Keun Mo Yang | 22,744,796 | 48.00% | 13D (active) | Jan 29, 2026 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of PLYX | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| Vanguard Capital Management LLC | 1,657,872 | 3.33% | $4.41M | −516 | 0.00% |
| Geode Capital Management, LLC | 170,998 | 0.34% | $455.08K | +325 | 0.00% |
| Vanguard Fiduciary Trust Co | 105,072 | 0.21% | $279.49K | +516 | 0.00% |
| Hrt Financial LP | 82,094 | 0.16% | $218 | New | 0.00% |
| State Street Corp | 58,104 | 0.12% | $154.56K | – | 0.00% |
| BlackRock, Inc. | 41,012 | 0.08% | $109.09K | – | 0.00% |
| Jane Street Group, LLC | 31,441 | 0.06% | $83.63K | New | 0.00% |
| Northern Trust Corp | 27,987 | 0.06% | $74.45K | – | 0.00% |
| Allworth Financial LP | 7,727 | 0.02% | $20.55K | New | 0.00% |
| Vanguard Global Advisers, LLC | 6,318 | 0.01% | $16.81K | – | 0.00% |
| Tower Research Capital LLC (TRC) | 3,002 | 0.01% | $7.99K | +1,221 | 0.00% |
| UBS Group AG | 1,283 | 0.00% | $3.41K | −12,196 | 0.00% |
| Fortitude Family Office, LLC | 189 | 0.00% | $503 | New | 0.00% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 13 | 2M | 4.4% | 4 / 3 | 2 / 5 | 0M | 0M |
| Q1 2026 | 14 | 2M | 4.5% | 14 / 0 | 0 / 0 | 2M | 0M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of PLYX | Value | % of fund | As of |
|---|---|---|---|---|---|
| Vanguard Total Stock Market Index Fund | 1,468,014 | 2.95% | $3.90M | 0.00% | Jun 30, 2026 |
| Vanguard Extended Market Index Fund | 142,033 | 0.28% | $377.81K | 0.00% | Jun 30, 2026 |
| Fidelity Extended Market Index Fund | 67,079 | 0.13% | $219.35K | 0.00% | May 31, 2026 |
| Fidelity Nasdaq Composite Index Fund | 28,648 | 0.06% | $93.68K | 0.00% | May 31, 2026 |
| Fidelity Total Market Index Fund | 26,450 | 0.05% | $86.49K | 0.00% | May 31, 2026 |
| Vanguard Balanced Index Fund | 25,969 | 0.05% | $69.08K | 0.00% | Jun 30, 2026 |
| Vanguard Institutional Total Stock Market Index Fund | 21,856 | 0.04% | $58.14K | 0.00% | Jun 30, 2026 |
| Fidelity Series Total Market Index Fund | 19,605 | 0.04% | $64.11K | 0.00% | May 31, 2026 |
| Total Stock Market Index Trust | 865 | 0.00% | $2.30K | 0.00% | Jun 30, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Alex Keun Mo Yang | Chief Executive Officer, Director, 10% owner | – | – | May 28, 2026 |
| G. Michael Landis | Chief Financial Officer, Director | 228,225 | 0.46% | Feb 20, 2026 |
| Lisa Bollinger | Chief Medical Officer | 150,358 | 0.30% | Jan 29, 2026 |
| Andrew John O | Chief Investment Officer | 471,808 | 0.95% | Jan 29, 2026 |
| Partners Healthcare Ltd Mstone | Director, 10% owner | 25,633,249 | 51.42% | May 28, 2026 |
| III Francis A. Braun | Director | – | – | Jan 29, 2026 |
| Mitchel Berger | Director | – | – | Jan 29, 2026 |
| Charles S. Ryan | Director | – | – | Jan 29, 2026 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Partners Healthcare Ltd Mstone Director, 10% owner | May 27, 2026 | Buy | +88,453 | $4.07 | $360.00K | 24,233,249 |
| G. Michael Landis Chief Financial Officer, Director | Feb 18, 2026 | Buy | +2,867 | $2.79 | $8.00K | 228,225 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.