Comparable stake leader
Chiang Jing-Bin
SEC ownership of J-Star Holding Co., Ltd.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001875016.
Disclosed value leader
Ching-Chou Huang
Comparable rows
0/11
Latest evidence
30 Jun 2026
- Public ticker
- YMAT on Nasdaq
- Parsed ownership sources
-
3/4/5 and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Chiang Jing-Bin
Ranking: Comparable ownership first, then disclosed value
- Latest parsed ownership date
-
30 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001875016
- Issuer location
- Taichung City 407, China
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
1 signal
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of J-Star Holding Co., Ltd. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Chiang Jing-Bin
Disclosed value leader
Ching-Chou Huang
Comparable rows
0/11
Latest evidence
30 Jun 2026
3/4/5
13F
Highest disclosed value: $117,600
11 rows are not safely comparable across share classes.
Showing 1-8 of 11 holder rows.
Quick read
Ching-Chou Huang has the largest disclosed position value at $117.6K.
0 of 11 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Ching-Chou Huang's linked filing trail.
Disclosed position value
Top 5
Ching-Chou Huang
$117.6K
Ping-Hong Lin
$117.6K
Shen-Huei Wang
$117.6K
Ting-Pang Sung
$117.6K
Sam van
$83.9K
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-8 of 11 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Chiang Jing-Bin |
3/4/5
Director, Chairman, 10%+ Owner
|
—
class O/S missing
|
—
6,097,183 shares
|
— | 18 Mar 2026 |
| New Moon Corp |
3/4/5
10%+ Owner
|
—
class O/S missing
|
—
4,888,092 shares
|
— | 18 Mar 2026 |
| Ching-Chou Huang |
3/4/5
Director
|
—
class O/S missing
|
$117,600
240,000 shares
|
— | 18 Mar 2026 |
| Ping-Hong Lin |
3/4/5
Director
|
—
class O/S missing
|
$117,600
240,000 shares
|
— | 18 Mar 2026 |
| Shen-Huei Wang |
3/4/5
Director
|
—
class O/S missing
|
$117,600
240,000 shares
|
— | 18 Mar 2026 |
| Ting-Pang Sung |
3/4/5
Director
|
—
class O/S missing
|
$117,600
240,000 shares
|
— | 18 Mar 2026 |
| Sam van |
3/4/5
CEO
|
—
class O/S missing
|
$83,853
171,129 shares
|
— | 18 Mar 2026 |
| StoneX Group Inc. |
13F
Company
|
—
class O/S missing
|
$13,823
12,218 shares
|
— | 30 Jun 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 28 Sep 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-7 of 7 reporting-owner rows connected to J-Star Holding Co., Ltd.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
7
Largest Forms 3/4/5 holder
Ping-Hong Lin
Net 12M change
$0
Latest report
18 Mar 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Ping-Hong Lin | Director | $117,600 | Mixed | 18 Mar 2026 | ||
| Ching-Chou Huang | Director | $117,600 | Mixed | 18 Mar 2026 | ||
| Shen-Huei Wang | Director | $117,600 | Mixed | 18 Mar 2026 | ||
| Ting-Pang Sung | Director | $117,600 | Mixed | 18 Mar 2026 | ||
| Sam van | Ceo | $83,853 | Mixed | 18 Mar 2026 | ||
| Chiang Jing-Bin | Director, Chairman, 10%+ Owner | Mixed | 18 Mar 2026 | |||
| New Moon Corp | 10%+ Owner | Mixed | 18 Mar 2026 |
Recent insider transactions for J-Star Holding Co., Ltd.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Ting-Pang Sung | YMAT | Class A Ordinary Shares | 0 | 240,000 | 18 Mar 2026 | Direct | ||||
| Shen-Huei Wang | YMAT | Class A Ordinary Shares | 0 | 240,000 | 18 Mar 2026 | Direct | ||||
| Van Sam | YMAT | Class A Ordinary Shares | 0 | 171,129 | 18 Mar 2026 | Direct | ||||
| Ping-Hong Lin | YMAT | Class A Ordinary Shares | 0 | 240,000 | 18 Mar 2026 | Direct | ||||
| New Moon Corp | YMAT | Class B Ordinary Shares | 0 | 4,888,092 | 18 Mar 2026 | Direct | ||||
| Chiang Jing-Bin | YMAT | Class B Ordinary Shares | 0 | 1,209,091 | 18 Mar 2026 | Direct | ||||
| Chiang Jing-Bin | YMAT | Class B Ordinary Shares | 0 | 4,888,092 | 18 Mar 2026 | Refer to Footnote | ||||
| Ching-Chou Huang | YMAT | Class A Ordinary Shares | 0 | 240,000 | 18 Mar 2026 | Direct |
* marks a reported price that did not pass the local price check.