YMAT
J-Star Holding Co., Ltd.Company with tickers: YMAT
CIK
1875016
CUSIP
G81237128
Shares Outstanding
13,953,333
13F Activity (30d)
2 filings
2 filers
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 2
Total Value: $9,939
Total Shares: 36,144
Institutional Ownership Trend
Holder Concentration
Across 2 13F filers · Δ vs Dec 31, 2025Top Holder
61.3%
−10.0 pts
Top 5
100.0%
0.0 pts
Top 10
100.0%
0.0 pts
HHI
5,256
Highly concentrated
−573
Quarterly Activity
vs Dec 31, 2025
New
2
Increased
0
Decreased
0
Sold Out
3
Unchanged
0
Holder count:
-1
Institutional value:
-57.3%
Shares held:
-27.7%
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mega CITADEL ADVISORS LLC | 22,160 | $6,094 | |
| Mid XTX Topco Ltd | 13,984 | $3,845 |
Top Sold-Out Positions
vs Dec 31, 2025| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Large HRT FINANCIAL LP | 35,647 | $16,611 | |
| Small TWO SIGMA SECURITIES, LLC | 13,635 | $6,353 | |
| Mega UBS Group AG | 719 | $335 |
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Mega CITADEL ADVISORS LLC | $6,094 | 61.31% | 22,160 | Shares | Defined | 2026-05-15 | ||||
| Mid XTX Topco Ltd | $3,845 | 38.69% | 13,984 | Shares | Defined | 2026-05-15 | ||||
| No holders match your search. | ||||||||||