Ironwood Pharmaceuticals, Inc. - Class A (IRWD)
IRWD moved a median of +0.07% 30 minutes after news, and -0.69% by the close. How IRWD actually reacts to news — the realized, point-in-time move the market made, measured across 342 labeled events over the last three years with zero look-ahead.
IRWD’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | -0.05% | 48% | 341 |
| 30-min | +0.07% | 50% | 341 |
| 60-min | -0.12% | 47% | 341 |
| to close | -0.69% | 44% | 340 |
| Middle 50% of IRWD reactions | -1.25% to +1.50% |
|---|---|
| Median reaction (30-min) | +0.07% |
| Measured reactions | 342 |
Half of all Ironwood Pharmaceuticals, Inc. - Class A news events land between -1.25% and +1.50% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How IRWD reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 21 | +0.73% | 62% | +1.10% |
| Analyst downgrades | 22 | -0.34% | 36% | -0.31% |
| Coverage initiations | 14 | +1.04% | 64% | +0.21% |
| Rating reiterations | 17 | 0.00% | 47% | 0.00% |
Last 3 years, pulled 2026-09-21. Reaction = percent move vs. the price at the news timestamp. Counts and medians only. The same measurement runs across every name in the dataset. 2 further classes were observed with fewer than 10 measured events and are not published. See how IRWD ranks against every other measured name →
That’s how IRWD usually reacts — get an email when it moves on news →Email me when IRWD moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to IRWD's baseline. Nothing else.
Recent IRWD events, each with its measured reaction.
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the IRWD section they belong to.
Where else IRWD is measured.
IRWD earnings → · Analyst actions → · SEC filings →
Other Healthcare names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| REGENERX BIOPHARMS INC (RGRX) | 343 | 0.00% | 36% |
| Allena Pharmaceuticals, Inc. (ALNA) | 342 | 0.00% | 41% |
| Brookdale Senior Living Inc. (BKD) | 341 | +0.36% | 62% |
| Vaxart, Inc. (VXRT) | 341 | -0.81% | 41% |
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 Healthcare names, measured the same way →
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Every name we’ve measured, in one place.
How the numbers are made.
How is Ironwood Pharmaceuticals, Inc. - Class A's median reaction calculated?
Every labeled IRWD 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 342 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. 50% of IRWD'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 IRWD'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.