J-Star Holding Co., Ltd.

Exhibit 99.1 MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS The following management’s discussion and analysis of financial condition and results of operations should be read in conjunction with our unaudited interim condensed consolidated financial statements and the related notes for the six months ended June 30, 2026 and 2025 (and related notes furnished on Form 6-K on October 23, 2026) as well as our audited consolidated financial statements and relat…

6-K · 2026-10-27 · 0001493152-26-048697

Exhibit 99.1 J-Star Holding Co., Ltd. Files Interim Financial Report on Form 6-K Company is Highlighting Strategic Focus on U.S. Opportunities, Balance Sheet Improvement, and Management Commitment TAICHUNG, TAIWAN and HOUSTON, TX - October 23, 2026 - J-Star Holding Co., Ltd. (Nasdaq: YMAT) (“J-Star” or the “Company”), an innovator in advanced composite manufacturing, today announced it has filed its unaudited interim financial results for the six months ended June 30, 2026, on Form 6-K with t…

6-K · 2026-10-23 · 0001493152-26-048239

Exhibit 99.1 J-Star Holding Co., Ltd. (Incorporated in the Cayman Islands with limited liability) Notice of Class Meeting of the Holders of Class A Ordinary Shares To Be Held on October 29, 2026, at 9:30 p.m., local time NOTICE IS HEREBY GIVEN THAT the class meeting of the Class A shareholders (the “ Class Meeting ”) of J-Star Holding Co., Ltd. (the “ Company ”) will be held at 3rd Floor, No. 107, Wuquan West 3rd Street, West District, Taichung City, 403025, Taiwan, on October 29, 2026, at …

6-K · 2026-10-09 · 0001493152-26-046580

Exhibit 99.2

6-K · 2026-10-09 · 0001493152-26-046580

Exhibit 99.1 J-Star Holding Co., Ltd. Chairman and CEO Jonathan Chiang to Relocate to the United States to Lead Growth Initiatives TAIPEI, Taiwan, Sept. 29, 2026 - J-Star Holding Co., Ltd. (Nasdaq: YMAT) (“J-Star” or the “Company”), a global manufacturer of carbon fiber and composite material products, today announced that Jonathan Chiang, Chairman and Chief Executive Officer, will relocate full-time to the United States to lead the Company’s U.S. operations and support the next phase of its g…

6-K · 2026-09-29 · 0001493152-26-044808

Calculation of Filing Fee Tables F-3 J-Star Holding Co., Ltd. ──────────────────────────────────── Table 1: Newly Registered and Carry Forward Securities ☐Not Applicable ─────────────────────────────────────────────────────────────────────────────── Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Of…

F-3/A · 2026-09-14 · 0001493152-26-042496