Large J-Star Holding (YMAT) Class B stakes disclosed by chairman Chiang

Rhea-AI Filing Summary

J-Star Holding Co., Ltd. director and chairman Chiang Jing-Bin filed an initial ownership statement reporting sizeable stakes in the company’s Class B Ordinary Shares. The filing shows indirect ownership of 4,888,092 Class B shares held by NEW MOON CORPORATION, where Chiang is the sole shareholder with voting and dispositive power. It also reports direct ownership of 1,209,091 Class B shares in his own name. The document is a baseline disclosure of Chiang’s holdings and does not report any new share purchases or sales.

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

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1. Name and Address of Reporting Person^*

Chiang Jing-Bin

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

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 B Ordinary Shares	4,888,092	I	Refer to Footnote(1)
Class B Ordinary Shares	1,209,091	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:

1. The registered address of NEW MOON CORPORATION, a British Virgin Islands company, is OMC Chambers, Wickhams Cay 1, Road Town, Tortola, British Virgin Islands. 4,888,092 Class B Ordinary Shares directly held by NEW MOON CORPORATION of which Jing-Bin Chiang is the sole shareholder and holds the voting and dispositive power over the ordinary shares held by such entity.

	/s/ Chiang Jing-Bin	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)

FAQ

What does Chiang Jing-Bin’s Form 3 filing show for J-Star Holding (YMAT)?

The Form 3 shows Chiang Jing-Bin’s initial ownership in J-Star Holding’s Class B Ordinary Shares. He reports 4,888,092 shares held indirectly through NEW MOON CORPORATION and 1,209,091 shares held directly, establishing a clear baseline of his significant share position.

How many J-Star Holding (YMAT) shares does Chiang Jing-Bin own indirectly?

Chiang Jing-Bin indirectly owns 4,888,092 Class B Ordinary Shares through NEW MOON CORPORATION. The filing notes he is the sole shareholder of this British Virgin Islands company and holds voting and dispositive power over the ordinary shares it holds in J-Star Holding.

How many J-Star Holding (YMAT) shares does Chiang Jing-Bin hold directly?

The Form 3 reports that Chiang Jing-Bin directly holds 1,209,091 Class B Ordinary Shares of J-Star Holding. This direct stake is in addition to his larger indirect ownership through NEW MOON CORPORATION, highlighting both personal and entity-based holdings in the company.

What is NEW MOON CORPORATION’s role in J-Star Holding (YMAT) ownership?

NEW MOON CORPORATION, a British Virgin Islands company, directly holds 4,888,092 Class B Ordinary Shares of J-Star Holding. According to the filing, Chiang Jing-Bin is the sole shareholder of this entity and has voting and dispositive power over the shares NEW MOON CORPORATION owns.

Does the J-Star Holding (YMAT) Form 3 show any recent share transactions?

No specific purchases or sales are reported in this Form 3. The entries are classified as holdings, indicating the filing serves as an initial statement of beneficial ownership rather than documenting new buy or sell transactions in J-Star Holding shares.

What positions does Chiang Jing-Bin hold at J-Star Holding (YMAT)?

Chiang Jing-Bin is identified as a director, a ten percent owner, and chairman of J-Star Holding. These roles, combined with his substantial direct and indirect Class B Ordinary Share holdings, underscore his significant governance and economic interest in the company.