Atlas Corp. Common Shares (ATCO)
ATCO moved a median of -0.03% 30 minutes after news, and 0.00% by the close. How ATCO actually reacts to news — the realized, point-in-time move the market made, measured across 440 labeled events over its full measured history with zero look-ahead.
ATCO’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 48% | 377 |
| 30-min | -0.03% | 47% | 377 |
| 60-min | 0.00% | 49% | 377 |
| to close | 0.00% | 46% | 377 |
| Middle 50% of ATCO reactions | -0.70% to +0.65% |
|---|---|
| Median reaction (30-min) | -0.03% |
| Measured reactions | 440 |
Half of all Atlas Corp. Common Shares news events land between -0.70% and +0.65% 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 ATCO moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to ATCO's baseline. Nothing else.
Recent ATCO events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| IFS Appoints Ryan Courson as Chief Financial Officer | Press release | PR Newswire | — | — | |
| Atlas Declares Quarterly Dividends on Preferred Shares | Press release | Canada Newswire | — | — | |
| Atlas Declares Quarterly Dividends on Preferred Shares | Press release | Canada Newswire | — | — | |
| Atlas Declares Quarterly Dividends on Preferred Shares | Press release | Canada Newswire | — | — | |
| Atlas Declares Quarterly Dividends on Preferred Shares | Press release | Canada Newswire | — | — | |
| Atlas Corp. Releases 2023 Sustainability Report | Press release | Canada Newswire | — | — | |
| Atlas Declares Quarterly Dividends on Preferred Shares | Press release | Canada Newswire | — | — | |
| Atlas Declares Quarterly Dividends on Preferred Shares | Press release | Canada Newswire | — | — | |
| Atlas Declares Quarterly Dividends on Preferred Shares | Press release | PR Newswire | — | — | |
| Seaspan Corporation enters new market segment with strategic order of new dual-fuel LNG Pure Car and Truck Carrier vessels | Press release | Canada Newswire | — | — | |
| Atlas Corp. Announces the Completion of Full Redemption of Its Series I Preferred Shares | Press release | Canada Newswire | — | — |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the ATCO section they belong to.
Where else ATCO is measured.
ATCO earnings → · Analyst actions → · SEC filings →
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Every name we’ve measured, in one place.
How the numbers are made.
How is Atlas Corp. Common Shares's median reaction calculated?
Every labeled ATCO 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 440 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 ATCO'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 ATCO'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.