TimkenSteel Corporation Common Shares (TMST)
TMST moved a median of +0.15% 30 minutes after news, and +0.45% by the close. How TMST actually reacts to news — the realized, point-in-time move the market made, measured across 223 labeled events over the last three years with zero look-ahead.
TMST’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 20% | 46 |
| 30-min | +0.15% | 62% | 47 |
| 60-min | +0.25% | 68% | 47 |
| to close | +0.45% | 58% | 48 |
| Middle 50% of TMST reactions | -0.34% to +1.05% |
|---|---|
| Median reaction (30-min) | +0.15% |
| Measured reactions | 223 |
Half of all TimkenSteel Corporation Common Shares news events land between -0.34% and +1.05% 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 TMST moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to TMST's baseline. Nothing else.
Recent TMST events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form ARS Metallus Inc. For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | — | — | |
| Form DEF 14A Metallus Inc. For: Apr 30 | SEC filing · Form DEF | SEC EDGAR | — | — | |
| Form DEFA14A Metallus Inc. | SEC filing · Form DEFA14A | SEC EDGAR | — | — | |
| Form 10-K Metallus Inc. For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | — | — | |
| Form 8-K Metallus Inc. For: Feb 19 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 10-Q Metallus Inc. For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | — | — | |
| Form 8-K Metallus Inc. For: Nov 06 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 10-Q Metallus Inc. For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | — | — | |
| Form 8-K Metallus Inc. For: Aug 07 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 8-K Metallus Inc. For: May 19 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 10-Q Metallus Inc. For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | — | — | |
| Form 8-K Metallus Inc. For: May 07 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 8-K Metallus Inc. For: May 08 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form ARS Metallus Inc. For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | — | — | |
| Form DEF 14A Metallus Inc. For: May 07 | SEC filing · Form DEF | SEC EDGAR | — | — | |
| Form DEFA14A Metallus Inc. | SEC filing · Form DEFA14A | SEC EDGAR | — | — | |
| Form 10-K Metallus Inc. For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | — | — | |
| Form 8-K Metallus Inc. For: Feb 27 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 10-Q Metallus Inc. For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | — | — | |
| Form 8-K Metallus Inc. For: Nov 07 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 10-Q Metallus Inc. For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | — | — | |
| Form 8-K Metallus Inc. For: Aug 08 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 8-K Metallus Inc. For: May 15 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 10-Q Metallus Inc. For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | — | — | |
| Form 8-K Metallus Inc. For: May 09 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 8-K Metallus Inc. For: May 07 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form ARS Metallus Inc. For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | — | — | |
| Form DEF 14A Metallus Inc. For: May 07 | SEC filing · Form DEF | SEC EDGAR | — | — | |
| Form DEFA14A Metallus Inc. | SEC filing · Form DEFA14A | SEC EDGAR | — | — | |
| Form 10-K Metallus Inc. For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | — | — | |
| Form 8-K Metallus Inc. For: Feb 27 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Metallus Announces Fourth-Quarter and Full-Year 2023 Earnings Webcast Details | Press release | PR Newswire | — | — | |
| TimkenSteel Announces Fourth-Quarter and Full-Year 2023 Earnings Webcast Details | Press release | PR Newswire | +0.00% | +0.59% | |
| Form 8-K TimkenSteel Corp For: Jan 30 | SEC filing · Form 8-K | SEC EDGAR | +0.34% | -0.69% | |
| TimkenSteel Announces Intent to Change Name to Metallus Inc. | Press release | PR Newswire | +0.00% | -0.14% | |
| Form 8-K TimkenSteel Corp For: Dec 15 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | +2.59% | |
| Sidoti Events, LLC's Virtual December Small-Cap Conference | Press release | Accesswire | -0.82% | -1.25% | |
| Form 10-Q TimkenSteel Corp For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.00% | -1.24% | |
| Form 8-K TimkenSteel Corp For: Nov 02 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | -1.24% | |
| TimkenSteel Announces Third-Quarter 2023 Results | Press release | PR Newswire | +0.00% | -1.24% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the TMST section they belong to.
Where else TMST is measured.
TMST earnings → · Analyst actions → · SEC filings →
Other Basic Materials names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| AURYN RESOURCES INC (AUG) | 225 | 0.00% | 43% |
| Wheaton Precious Metals Corp (WPM_TSE) | 225 | -0.05% | 49% |
| Lightwave Logic, Inc. (LWLG) | 222 | +0.31% | 53% |
| Healthcare Triangle, Inc. (HCTI) | 220 | -0.69% | 40% |
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 →
Every ticker we measure the same way24
Apple (AAPL)
How AAPL actually reacts to news, measured.
NVIDIA (NVDA)
How NVDA actually reacts to news, measured.
Tesla (TSLA)
How TSLA actually reacts to news, measured.
Microsoft (MSFT)
How MSFT actually reacts to news, measured.
Advanced Micro Devices (AMD)
How AMD actually reacts to news, measured.
Amazon (AMZN)
How AMZN actually reacts to news, measured.
Alphabet (GOOG)
How GOOG actually reacts to news, measured.
Meta Platforms (META)
How META actually reacts to news, measured.
Broadcom (AVGO)
How AVGO actually reacts to news, measured.
JPMorgan Chase (JPM)
How JPM actually reacts to news, measured.
Visa (V)
How V actually reacts to news, measured.
Walmart (WMT)
How WMT actually reacts to news, measured.
Eli Lilly (LLY)
How LLY actually reacts to news, measured.
UnitedHealth Group (UNH)
How UNH actually reacts to news, measured.
Netflix (NFLX)
How NFLX actually reacts to news, measured.
Johnson & Johnson (JNJ)
How JNJ actually reacts to news, measured.
Exxon Mobil (XOM)
How XOM actually reacts to news, measured.
Home Depot (HD)
How HD actually reacts to news, measured.
Costco (COST)
How COST actually reacts to news, measured.
Mastercard (MA)
How MA actually reacts to news, measured.
Oracle (ORCL)
How ORCL actually reacts to news, measured.
Salesforce (CRM)
How CRM actually reacts to news, measured.
Bank of America (BAC)
How BAC actually reacts to news, measured.
Coca-Cola (KO)
How KO actually reacts to news, measured.
Walt Disney (DIS)
How DIS actually reacts to news, measured.
Browse all tickers
Every name we’ve measured, in one place.
How the numbers are made.
How is TimkenSteel Corporation Common Shares's median reaction calculated?
Every labeled TMST 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 223 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. 62% of TMST'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 TMST'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.