Glatfelter Corporation (GLT)
GLT moved a median of 0.00% 30 minutes after news, and -0.27% by the close. How GLT actually reacts to news — the realized, point-in-time move the market made, measured across 281 labeled events over the last three years with zero look-ahead.
GLT’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 37% | 153 |
| 30-min | 0.00% | 47% | 157 |
| 60-min | -0.27% | 45% | 157 |
| to close | -0.27% | 44% | 157 |
| Middle 50% of GLT reactions | -1.67% to +2.29% |
|---|---|
| Median reaction (30-min) | 0.00% |
| Measured reactions | 281 |
Half of all Glatfelter Corporation news events land between -1.67% and +2.29% 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 GLT moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to GLT's baseline. Nothing else.
Recent GLT events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form 8-K Magnera Corp For: Mar 09 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 10-Q Magnera Corp For: Dec 27 | SEC filing · Form 10-Q | SEC EDGAR | — | — | |
| Form 8-K Magnera Corp For: Feb 05 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 8-K Magnera Corp For: Jan 29 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form ARS Magnera Corp For: Sep 27 | SEC filing · Form ARS | SEC EDGAR | — | — | |
| Form DEF 14A Magnera Corp For: Mar 09 | SEC filing · Form DEF | SEC EDGAR | — | — | |
| Form DEFA14A Magnera Corp | SEC filing · Form DEFA14A | SEC EDGAR | — | — | |
| Form 8-K Magnera Corp For: Nov 28 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 10-K Magnera Corp For: Sep 27 | SEC filing · Form 10-K | SEC EDGAR | — | — | |
| Form 8-K Magnera Corp For: Nov 19 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 8-K Magnera Corp For: Sep 27 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 8-K Magnera Corp For: Aug 05 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 10-Q Magnera Corp For: Jun 28 | SEC filing · Form 10-Q | SEC EDGAR | — | — | |
| Form 8-K Magnera Corp For: Aug 06 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 11-K Magnera Corp For: Dec 31 | SEC filing · Form 11-K | SEC EDGAR | — | — | |
| Form SD Magnera Corp | SEC filing · Form SD | SEC EDGAR | — | — | |
| Form 10-Q Magnera Corp For: Mar 29 | SEC filing · Form 10-Q | SEC EDGAR | — | — | |
| Form 8-K Magnera Corp For: May 07 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 10-Q Magnera Corp For: Dec 28 | SEC filing · Form 10-Q | SEC EDGAR | — | — | |
| Form 8-K Magnera Corp For: Feb 06 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 8-K/A Magnera Corp For: Nov 04 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 8-K Magnera Corp For: Dec 16 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 8-K/A Magnera Corp For: Nov 04 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 8-K Magnera Corp For: Nov 04 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form S-8 Magnera Corp | SEC filing · Form S-8 | SEC EDGAR | — | — | |
| Form S-8 POS Magnera Corp | SEC filing · Form S-8 | SEC EDGAR | — | — | |
| Form 10-Q Glatfelter Corp For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | -0.52% | -6.70% | |
| Form 8-K Glatfelter Corp For: Oct 30 | SEC filing · Form 8-K | SEC EDGAR | +2.05% | -3.08% | |
| Glatfelter Reports Third Quarter 2024 Results | Press release | GlobeNewswire | +2.05% | -3.08% | |
| Form 8-K Glatfelter Corp For: Oct 23 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | -0.56% | |
| Glatfelter Shareholders Approve Proposals Related to the Proposed Merger of Berry’s Health, Hygiene and Specialties Global Nonwovens and Films Business with Glatfelter | Press release | GlobeNewswire | +1.11% | +0.58% | |
| Berry and Glatfelter Announce Information for Anticipated Completion of Spin-Off and Subsequent Merger of Berry’s Health, Hygiene and Specialties Global Nonwovens and Films Business with Glatfelter | Press release | GlobeNewswire | +1.11% | +0.58% | |
| Form 8-K Glatfelter Corp For: Oct 21 | SEC filing · Form 8-K | SEC EDGAR | -0.29% | +0.00% | |
| Form 8-K Glatfelter Corp For: Oct 11 | SEC filing · Form 8-K | SEC EDGAR | -2.87% | -2.87% | |
| Berry and Glatfelter Announce Pricing of Upsized Senior Secured Notes Offering by Berry Subsidiary in Connection with Proposed Merger of Berry’s Health, Hygiene and Specialties Global Nonwovens and Films Business with Glatfelter | Press release | GlobeNewswire | +0.00% | +1.16% | |
| Berry and Glatfelter Announce Proposed Offering by a Berry Subsidiary of Senior Secured Notes in Connection with the Proposed Merger of Berry’s Health, Hygiene and Specialties Global Nonwovens and Films Business with Glatfelter | Press release | GlobeNewswire | +5.11% | +0.00% | |
| Glatfelter Announces Tunable Lithium-ion Battery Separator at The Battery Show | Press release | GlobeNewswire | +0.29% | -2.58% | |
| Glatfelter Advances Sustainable Espresso Lid Solutions | Press release | GlobeNewswire | — | +4.71% | |
| Berry Global and Glatfelter Announce Date of the Glatfelter Shareholder Meeting in Connection with the Proposed Merger of Berry’s Health, Hygiene and Specialties Global Nonwovens and Films Business with Glatfelter | Press release | Business Wire | +0.00% | -4.00% | |
| Form EFFECT Glatfelter Corp | SEC filing · Form EFFECT | SEC EDGAR | +1.18% | +5.92% | |
| Form S-4/A Glatfelter Corp | SEC filing · Form S-4 | SEC EDGAR | -0.64% | -3.82% | |
| Form S-4 Glatfelter Corp | SEC filing · Form S-4 | SEC EDGAR | +1.11% | +5.56% | |
| Berry and Glatfelter Announce Magnera Board of Director Appointments in Connection With Proposed Merger of Berry’s Health, Hygiene and Specialties Global Nonwovens and Films Business With Glatfelter | Press release | GlobeNewswire | -1.67% | +0.56% | |
| Form 8-K Glatfelter Corp For: Aug 16 | SEC filing · Form 8-K | SEC EDGAR | -1.67% | +0.56% | |
| Form 10-Q Glatfelter Corp For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +3.05% | +3.66% | |
| Form 8-K Glatfelter Corp For: Aug 08 | SEC filing · Form 8-K | SEC EDGAR | +2.67% | +12.00% | |
| Glatfelter Reports Second Quarter 2024 Results | Press release | GlobeNewswire | +2.67% | +12.00% | |
| Berry and Glatfelter Announce New Brand Name and Identity in Connection with Proposed Merger of Berry's Health, Hygiene and Specialties Global Nonwovens and Films Business and Glatfelter | Press release | Business Wire | +0.67% | -0.67% | |
| Glatfelter Corporation to Report Earnings on August 8th | Press release | GlobeNewswire | +0.95% | -0.32% | |
| Berry and Glatfelter Announce Additional Regulatory Milestone in Proposed Transaction for Spin-Off and Merger of Berry’s Health, Hygiene and Specialties Global Nonwovens and Films Business with Glatfelter | Press release | Business Wire | +0.00% | +4.68% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the GLT section they belong to.
Where else GLT is measured.
GLT earnings → · Analyst actions → · SEC filings →
Other Basic Materials names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| Griffon Corporation (GFF) | 287 | -0.14% | 44% |
| ENERTOPIA CORP (ENRT) | 281 | 0.00% | 41% |
| VALLOUREC SA SP/ADR (VLOWY) | 281 | 0.00% | 20% |
| Masco Corporation (MAS) | 280 | +0.16% | 58% |
Same sector, same measurement: percent move vs. the price at the news timestamp, read at 30 minutes. Sample sizes differ, so the medians are comparable but the confidence behind them is not.
All Basic Materials names, measured the same way →
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How the numbers are made.
How is Glatfelter Corporation's median reaction calculated?
Every labeled GLT 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 281 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. 47% of GLT'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 GLT'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.