GSK plc American Depositary Shares (Each representing two Ordinary Shares) (GSK)
GSK moved a median of +0.01% 30 minutes after news, and -0.03% by the close. How GSK actually reacts to news — the realized, point-in-time move the market made, measured across 1,452 labeled events over the last three years with zero look-ahead.
GSK’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | -0.01% | 45% | 1,448 |
| 30-min | +0.01% | 51% | 1,450 |
| 60-min | +0.04% | 53% | 1,450 |
| to close | -0.03% | 48% | 1,441 |
| Middle 50% of GSK reactions | -0.21% to +0.33% |
|---|---|
| Median reaction (30-min) | +0.01% |
| Measured reactions | 1,452 |
Half of all GSK plc American Depositary Shares (Each representing two Ordinary Shares) news events land between -0.21% and +0.33% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How GSK reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 30 | +0.15% | 60% | +0.42% |
| Analyst downgrades | 25 | -0.01% | 48% | -0.03% |
| Coverage initiations | 18 | +0.09% | 67% | +0.09% |
| Rating reiterations | 17 | -0.11% | 35% | -0.04% |
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. 1 further class was observed with fewer than 10 measured events and is not published. See how GSK ranks against every other measured name →
That’s how GSK usually reacts — get an email when it moves on news →Email me when GSK moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to GSK's baseline. Nothing else.
Recent GSK events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form 6-K GSK plc For: Oct 15 | SEC filing · Form 6-K | SEC EDGAR | +0.13% | -0.84% | |
| Form 6-K GSK plc For: Oct 14 | SEC filing · Form 6-K | SEC EDGAR | -0.07% | +0.12% | |
| Form 6-K GSK plc For: Oct 13 | SEC filing · Form 6-K | SEC EDGAR | -0.16% | -1.80% | |
| Form S-8 GSK plc | SEC filing · Form S-8 | SEC EDGAR | +0.14% | -0.42% | |
| Form 6-K GSK plc For: Oct 08 | SEC filing · Form 6-K | SEC EDGAR | -0.03% | +1.36% | |
| Viola Davis partners with GSK to educate adults 50 and older about their shingles risk | Press release | PR Newswire | +0.31% | +0.30% | |
| Form 6-K GSK plc For: Oct 06 | SEC filing · Form 6-K | SEC EDGAR | +0.03% | +0.88% | |
| Form 6-K GSK plc For: Oct 01 | SEC filing · Form 6-K | SEC EDGAR | +0.03% | -1.05% | |
| Form 6-K GSK plc For: Sep 24 | SEC filing · Form 6-K | SEC EDGAR | +0.12% | -0.40% | |
| Form 6-K GSK plc For: Sep 22 | SEC filing · Form 6-K | SEC EDGAR | +0.08% | -0.18% | |
| Form CERT GSK plc | SEC filing · Form CERT | SEC EDGAR | +0.13% | -0.12% | |
| Form 6-K GSK plc For: Sep 15 | SEC filing · Form 6-K | SEC EDGAR | -0.06% | +0.50% | |
| Form 8-A12B GSK plc | SEC filing · Form 8-A12B | SEC EDGAR | +0.03% | -0.12% | |
| Form 6-K GSK plc For: Sep 14 | SEC filing · Form 6-K | SEC EDGAR | -0.55% | -0.50% | |
| Form 6-K GSK plc For: Sep 11 | SEC filing · Form 6-K | SEC EDGAR | -0.08% | -0.07% | |
| Form 6-K GSK plc For: Sep 10 | SEC filing · Form 6-K | SEC EDGAR | -0.07% | -0.86% | |
| Form 6-K GSK plc For: Sep 09 | SEC filing · Form 6-K | SEC EDGAR | -0.29% | -0.31% | |
| Form 6-K GSK plc For: Sep 08 | SEC filing · Form 6-K | SEC EDGAR | -0.12% | -0.94% | |
| Form 6-K GSK plc For: Sep 01 | SEC filing · Form 6-K | SEC EDGAR | +0.07% | -0.88% | |
| Form 6-K GSK plc For: Aug 26 | SEC filing · Form 6-K | SEC EDGAR | -0.14% | -1.00% | |
| Form 6-K GSK plc For: Aug 24 | SEC filing · Form 6-K | SEC EDGAR | -0.33% | +0.33% | |
| Form 6-K GSK plc For: Aug 18 | SEC filing · Form 6-K | SEC EDGAR | +0.23% | +0.10% | |
| Form 13F-HR GSK plc For: Jun 30 | SEC filing · Form 13F-HR | SEC EDGAR | -0.02% | +1.06% | |
| Form 6-K GSK plc For: Aug 13 | SEC filing · Form 6-K | SEC EDGAR | +0.36% | +0.30% | |
| Form 6-K GSK plc For: Aug 11 | SEC filing · Form 6-K | SEC EDGAR | +0.10% | -0.64% | |
| Form 6-K GSK plc For: Aug 03 | SEC filing · Form 6-K | SEC EDGAR | +0.01% | +0.45% | |
| Form 6-K GSK plc For: Jul 30 | SEC filing · Form 6-K | SEC EDGAR | +0.02% | -0.12% | |
| Form 6-K GSK plc For: Jul 28 | SEC filing · Form 6-K | SEC EDGAR | -0.05% | -0.49% | |
| New survey reveals Canadians underestimate chronic hepatitis B and its link to liver cancer | Press release | Canada Newswire | -0.19% | -2.35% | |
| Form 6-K GSK plc For: Jul 24 | SEC filing · Form 6-K | SEC EDGAR | +0.25% | -0.04% | |
| Form 6-K GSK plc For: Jul 22 | SEC filing · Form 6-K | SEC EDGAR | -0.02% | -0.28% | |
| Jideytro (zidesamtinib) approved in the US for previously treated ROS1-positive non-small cell lung cancer | Press release | PR Newswire | -0.03% | -0.31% | |
| Form 6-K GSK plc For: Jul 20 | SEC filing · Form 6-K | SEC EDGAR | -0.29% | -2.38% | |
| Form 6-K GSK plc For: Jul 17 | SEC filing · Form 6-K | SEC EDGAR | +0.71% | +0.68% | |
| Form 6-K GSK plc For: Jul 16 | SEC filing · Form 6-K | SEC EDGAR | +0.29% | +0.65% | |
| Form 6-K GSK plc For: Jul 15 | SEC filing · Form 6-K | SEC EDGAR | -0.27% | +0.39% | |
| Form 6-K GSK plc For: Jul 14 | SEC filing · Form 6-K | SEC EDGAR | +0.11% | -0.06% | |
| Form 6-K GSK plc For: Jul 13 | SEC filing · Form 6-K | SEC EDGAR | -0.38% | +0.60% | |
| Form 6-K GSK plc For: Jul 10 | SEC filing · Form 6-K | SEC EDGAR | -0.77% | -0.38% | |
| Form 6-K GSK plc For: Jul 09 | SEC filing · Form 6-K | SEC EDGAR | +0.44% | +0.10% | |
| Form 6-K GSK plc For: Jul 01 | SEC filing · Form 6-K | SEC EDGAR | -0.17% | -0.50% | |
| Form 6-K GSK plc For: Jun 29 | SEC filing · Form 6-K | SEC EDGAR | +0.03% | +0.94% | |
| Form 6-K GSK plc For: Jun 26 | SEC filing · Form 6-K | SEC EDGAR | -0.22% | +0.27% | |
| Form 6-K GSK plc For: Jun 24 | SEC filing · Form 6-K | SEC EDGAR | -0.13% | -1.12% | |
| Form 6-K GSK plc For: Jun 23 | SEC filing · Form 6-K | SEC EDGAR | +0.10% | +0.76% | |
| Form 6-K GSK plc For: Jun 22 | SEC filing · Form 6-K | SEC EDGAR | +0.13% | -0.59% | |
| Form 11-K GSK plc For: Dec 31 | SEC filing · Form 11-K | SEC EDGAR | -0.05% | -0.82% | |
| Form 6-K GSK plc For: Jun 17 | SEC filing · Form 6-K | SEC EDGAR | -0.02% | -0.81% | |
| Utebzi (tebipenem pivoxil) approved in the US for adults with complicated urinary tract infections (cUTIs) | Press release | Business Wire | -0.10% | -2.16% | |
| Form 6-K GSK plc For: Jun 15 | SEC filing · Form 6-K | SEC EDGAR | +0.08% | -0.72% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the GSK section they belong to.
Where else GSK is measured.
GSK earnings → · Analyst actions → · SEC filings →
Other Healthcare names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| Centene Corporation (CNC) | 1,456 | +0.01% | 50% |
| Fluidigm Corporation (FLDM) | 1,452 | 0.00% | 49% |
| GENMARK DIAGNOSTICS (GNMK) | 1,451 | +0.06% | 51% |
| Replimune Group, Inc. (REPL) | 1,432 | +0.09% | 51% |
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 GSK plc American Depositary Shares (Each representing two Ordinary Shares)'s median reaction calculated?
Every labeled GSK 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 1,452 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. 51% of GSK'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 GSK'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.