J-Star Holding Co., Ltd. (YMAT) Ownership
YMAT ownership summary
as of October 18, 2026- Institutions
- 0.3% of shares outstanding
- Insiders
- 48.62% of shares outstanding
- Shares outstanding
- 2.8M
- Float
- 664K shares available to trade
- Short interest
- 3.98% 104K shares short
- Days to cover
- 0.03 short interest up 58.1% vs prior month
- Institutions 0.33%
- Insiders 48.62%
- Other investors 51.05%
YMAT top institutional holders
5 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | XTX Topco Ltd | 0.10% | 21K | $27,124 | +6,721 (+48.1%) | June 30, 2026 |
| 2 | TWO SIGMA SECURITIES, LLC | 0.00% | — | — | −13,635 (−100.0%) | March 31, 2026 |
| 3 | Citadel Advisors Llc | 0.00% | — | — | −22,160 (−100.0%) | June 30, 2026 |
| 4 | HRT FINANCIAL LLC | 0.00% | — | — | −35,647 (−100.0%) | March 31, 2026 |
| 5 | UBS Group AG | 0.00% | — | — | −719 (−100.0%) | March 31, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 5, 1 holders added 6,721 shares and 4 cut 72K.
YMAT shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns YMAT
Institutional investors own 0.3% of J-Star's shares and insiders 48.62%. The largest holder is XTX Topco Ltd with 0.10% of the shares (21K), as of June 30, 2026. Among the top 5 institutions, 1 added shares and 4 reduced their stake in the latest filings. Short interest is 3.98% of the float, or 0.03 days of average trading volume. The share count rose 384.2% since 2023.
Related: YMAT key metrics. See the YMAT stock overview for the latest quote and news.
YMAT ownership FAQ
Who owns the most J-Star stock?
The largest shareholders of J-Star are XTX Topco Ltd (0.10%), TWO SIGMA SECURITIES, LLC (0.00%), Citadel Advisors Llc (0.00%), HRT FINANCIAL LLC (0.00%), UBS Group AG (0.00%).
What percentage of J-Star is owned by institutions?
Institutions hold 0.3% of J-Star's shares outstanding; insiders hold 48.62%.
What is J-Star's short interest?
104K shares of J-Star were sold short, 3.98% of the float; at the average daily volume it would take 0.03 days to cover.
How many shares of J-Star are outstanding?
J-Star has 2.8M shares outstanding, of which 664K are in the public float.