J-Star Holding Co., Ltd. - Class A Ordinary Shares (YMAT)
YMAT moved a median of -0.01% 30 minutes after news, and +0.15% by the close. How YMAT actually reacts to news — the realized, point-in-time move the market made, measured across 84 labeled events over the last three years with zero look-ahead.
YMAT’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 40% | 50 |
| 30-min | -0.01% | 46% | 61 |
| 60-min | +0.65% | 56% | 63 |
| to close | +0.15% | 50% | 64 |
| Middle 50% of YMAT reactions | -4.77% to +1.93% |
|---|---|
| Median reaction (30-min) | -0.01% |
| Measured reactions | 84 |
Half of all J-Star Holding Co., Ltd. - Class A Ordinary Shares news events land between -4.77% and +1.93% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
Email me when YMAT moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to YMAT's baseline. Nothing else.
Recent YMAT events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| J-Star Holding Co., Ltd. Advances U.S. Drone Manufacturing Initiative; Negotiates Acquisition of Facility in the Greater Houston Area | Press release | GlobeNewswire | -15.95% | -28.79% | |
| Form 6-K J-Star Holding Co., Ltd. For: Oct 09 | SEC filing · Form 6-K | SEC EDGAR | -13.33% | +14.12% | |
| J-Star Holding Co., Ltd. Highlights Capital Initiatives to Fund Planned U.S. Expansion for Drone Frame Manufacturing in Houston, Texas | Press release | GlobeNewswire | -13.33% | +14.12% | |
| Form 6-K J-Star Holding Co., Ltd. For: Sep 29 | SEC filing · Form 6-K | SEC EDGAR | +0.40% | -8.54% | |
| J-Star Holding Co., Ltd. Chairman and CEO Jonathan Chiang to Relocate to the United States to Lead Growth Initiatives | Press release | GlobeNewswire | +0.40% | -8.54% | |
| Form 6-K J-Star Holding Co., Ltd. For: Sep 28 | SEC filing · Form 6-K | SEC EDGAR | +0.40% | -8.54% | |
| Form EFFECT J-Star Holding Co., Ltd. | SEC filing · Form EFFECT | SEC EDGAR | +3.42% | -2.06% | |
| Form F-3/A J-Star Holding Co., Ltd. | SEC filing · Form F-3 | SEC EDGAR | +3.92% | -0.98% | |
| Form F-3 J-Star Holding Co., Ltd. | SEC filing · Form F-3 | SEC EDGAR | — | -4.52% | |
| Form 6-K J-Star Holding Co., Ltd. For: Aug 03 | SEC filing · Form 6-K | SEC EDGAR | +0.00% | +4.92% | |
| J-Star Holding Co., Ltd Regains Compliance with Nasdaq Minimum Bid Price Requirement | Press release | GlobeNewswire | +8.55% | +7.43% | |
| Form 6-K J-Star Holding Co., Ltd. For: Jul 08 | SEC filing · Form 6-K | SEC EDGAR | -3.21% | +0.29% | |
| J-Star Holding Holding Co., Ltd Announces 1-for-5 Share Consolidation | Press release | GlobeNewswire | -3.21% | +0.29% | |
| Form 6-K J-Star Holding Co., Ltd. For: Jun 17 | SEC filing · Form 6-K | SEC EDGAR | -11.93% | +11.94% | |
| J-Star Holding Announces Receipt of Nasdaq Delisting Determination; Class A Ordinary Shares Expected to Continue Trading Pending Nasdaq Hearings Panel Review | Press release | GlobeNewswire | -4.17% | -19.58% | |
| Form 6-K J-Star Holding Co., Ltd. For: Jun 08 | SEC filing · Form 6-K | SEC EDGAR | -0.78% | -6.23% | |
| J-Star Holding Announces Successful Annual General Meeting and Reaffirms Commitment to U.S. Advanced Manufacturing Strategy | Press release | GlobeNewswire | -0.34% | -3.27% | |
| J-Star Holding Outlines Foundational Milestones Supporting Proposed Baytown Battery Manufacturing Facility | Press release | GlobeNewswire | -5.09% | +6.90% | |
| J-Star Holding Provides Additional Details on Baytown Economic Development Foundation LOI Supporting Proposed U.S. Solid-State Battery Manufacturing Facility | Press release | GlobeNewswire | +3.54% | +0.46% | |
| Form 6-K J-Star Holding Co., Ltd. For: May 26 | SEC filing · Form 6-K | SEC EDGAR | -6.67% | -8.00% | |
| J-Star Holding Subsidiary Receives Central Bank of Taiwan Authorization to Initiate $60 Million Sovereign-Backed Financing Framework through Designated Banks for U.S. Solid-State Battery Expansion ($122.5 Million Project) | Press release | GlobeNewswire | -6.67% | -8.00% | |
| Form 6-K J-Star Holding Co., Ltd. For: May 18 | SEC filing · Form 6-K | SEC EDGAR | +3.58% | -3.42% | |
| Form 6-K J-Star Holding Co., Ltd. For: May 08 | SEC filing · Form 6-K | SEC EDGAR | +8.02% | +104.31% | |
| J-Star Holding Signs MOU with White Group to Advance Financing for Texas Solid-State Battery Facility | Press release | GlobeNewswire | +8.02% | +104.31% | |
| Form 6-K J-Star Holding Co., Ltd. For: May 01 | SEC filing · Form 6-K | SEC EDGAR | +6.50% | +4.99% | |
| J-Star Holding Partners with Patriot Green Energy Technology for Made-In-USA Solid-State Battery Solutions | Press release | GlobeNewswire | +6.50% | +4.99% | |
| Form 20-F J-Star Holding Co., Ltd. For: Dec 31 | SEC filing · Form 20-F | SEC EDGAR | +0.00% | -1.44% | |
| Form 6-K J-Star Holding Co., Ltd. For: Apr 10 | SEC filing · Form 6-K | SEC EDGAR | — | +0.00% | |
| J-Star Holding Announces Return of Jonathan Chiang as Chief Executive Officer | Press release | GlobeNewswire | +0.00% | +8.93% | |
| Form 6-K J-Star Holding Co., Ltd. For: Feb 23 | SEC filing · Form 6-K | SEC EDGAR | -2.38% | +41.19% | |
| J-Star Signs Exclusive Distribution Agreement with PSSB | Press release | GlobeNewswire | -2.38% | +41.19% | |
| Form 6-K J-Star Holding Co., Ltd. For: Jan 22 | SEC filing · Form 6-K | SEC EDGAR | -1.93% | -9.21% | |
| J-Star Files Formal Complaints Against PwC with AICPA and PCAOB | Press release | GlobeNewswire | -1.93% | -9.21% | |
| Form 6-K J-Star Holding Co., Ltd. For: Jan 14 | SEC filing · Form 6-K | SEC EDGAR | — | -9.26% | |
| J-Star Signs MOU with PSSB to Provide Resins for Batteries | Press release | GlobeNewswire | — | -9.26% | |
| Form S-8 J-Star Holding Co., Ltd. | SEC filing · Form S-8 | SEC EDGAR | — | -0.70% | |
| Form 8-A12B/A J-Star Holding Co., Ltd. | SEC filing · Form 8-A12B | SEC EDGAR | -3.51% | +1.93% | |
| Form 6-K J-Star Holding Co., Ltd. For: Jan 06 | SEC filing · Form 6-K | SEC EDGAR | +0.00% | +4.66% | |
| J-Star Announces Strategic Plan to Exit China and Accelerate Expansion in the United States | Press release | GlobeNewswire | +0.00% | +4.66% | |
| Form 6-K J-Star Holding Co., Ltd. For: Dec 23 | SEC filing · Form 6-K | SEC EDGAR | +0.28% | +3.72% | |
| J-Star’s LITZMO Introduces ER-01: The Brand’s First Carbon Fiber Fat-Tire E-Assist Bicycle | Press release | GlobeNewswire | +0.28% | +3.72% | |
| Form 6-K J-Star Holding Co., Ltd. For: Dec 22 | SEC filing · Form 6-K | SEC EDGAR | -0.75% | -12.32% | |
| Form 6-K J-Star Holding Co., Ltd. For: Dec 18 | SEC filing · Form 6-K | SEC EDGAR | +0.00% | +15.19% | |
| J-Star Announces Interim Financial Results for the First Six Months of 2025 | Press release | GlobeNewswire | +8.51% | +15.19% | |
| Form 6-K J-Star Holding Co., Ltd. For: Dec 16 | SEC filing · Form 6-K | SEC EDGAR | -1.13% | -4.10% | |
| J-Star Announces Receipt of Nasdaq Notification Letter Regarding Minimum Bid Price Deficiency | Press release | GlobeNewswire | -1.13% | -4.10% | |
| Form 6-K J-Star Holding Co., Ltd. For: Dec 10 | SEC filing · Form 6-K | SEC EDGAR | +0.00% | +1.09% | |
| J-Star Announces Approval of Dual Class Share Structure by Shareholders | Press release | GlobeNewswire | -6.04% | -6.81% | |
| J-Star Announces General Meeting of Shareholders | Press release | GlobeNewswire | -0.74% | +0.37% | |
| Form 6-K J-Star Holding Co., Ltd. For: Nov 12 | SEC filing · Form 6-K | SEC EDGAR | -0.01% | +5.58% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the YMAT section they belong to.
Where else YMAT is measured.
YMAT earnings → · Analyst actions → · SEC filings →
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How the numbers are made.
How is J-Star Holding Co., Ltd. - Class A Ordinary Shares's median reaction calculated?
Every labeled YMAT news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 84 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 46% of YMAT's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does YMAT's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.