J-Star Holding director reports 240,000 YMAT shares

J-Star Holding Co., Ltd. director HUANG CHING-CHOU filed an initial ownership report, showing direct holdings of 240,000 Class A Ordinary Shares.

Rhea-AI Filing Summary

J-Star Holding Co., Ltd. director HUANG CHING-CHOU filed an initial ownership report, showing direct holdings of 240,000 Class A Ordinary Shares. This Form 3 does not report any new buy or sell transactions; it simply establishes the director’s existing equity position in the company.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider HUANG CHING-CHOU

Role Director

Type	Security	Shares	Price	Value
holding	Class A Ordinary Shares	--	--	--

Holdings After Transaction: Class A Ordinary Shares — 240,000 shares (Direct)

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the J-Star Holding (YMAT) Form 3 filing show?

The Form 3 shows that director HUANG CHING-CHOU holds 240,000 Class A Ordinary Shares of J-Star Holding Co., Ltd. It is an initial ownership report and does not reflect any new purchase or sale transactions.

Is the J-Star Holding (YMAT) Form 3 a buy or sell by the insider?

The Form 3 does not record a buy or sell transaction. It instead reports that the director directly owns 240,000 Class A Ordinary Shares, serving as a baseline disclosure of existing holdings required for insiders.

How many J-Star Holding (YMAT) shares does HUANG CHING-CHOU own?

The filing reports that HUANG CHING-CHOU directly owns 240,000 Class A Ordinary Shares of J-Star Holding Co., Ltd. This amount reflects total direct holdings following the reported status in the Form 3 filing.

Does the J-Star Holding (YMAT) Form 3 include any derivative securities?

The Form 3 does not list any derivative securities such as options or warrants for the reporting person. The filing only discloses direct ownership of 240,000 Class A Ordinary Shares with no derivative positions reported.

What is the significance of a Form 3 for J-Star Holding (YMAT)?

A Form 3 is an initial ownership statement for company insiders. For J-Star Holding, it formally records that a director holds 240,000 Class A Ordinary Shares, creating a public baseline of that insider’s equity position in the company.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/18/2026 - 09:01 AM EDT Learn about SEC filing dates

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

HUANG CHING-CHOU

(Last) (First) (Middle)

7/F-1, NO. 633, SEC. 2, TAIWAN BLVD.,

XITUN DISTRICT,

(Street)

TAICHUNG CITY 407

(City) (State) (Zip)

TAIWAN, PROVINCE OF CHINA

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/18/2026

3. Issuer Name and Ticker or Trading Symbol
J-Star Holding Co., Ltd. [ YMAT ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Class A Ordinary Shares	240,000	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	/s/ Huang Ching-Choug	03/18/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)