National Grid Transco, PLC National Grid PLC (NEW) American Depositary Shares (NGG)
NGG moved a median of +0.01% 30 minutes after news, and +0.05% by the close. How NGG actually reacts to news — the realized, point-in-time move the market made, measured across 597 labeled events over the last three years with zero look-ahead.
NGG’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 50% | 589 |
| 30-min | +0.01% | 51% | 595 |
| 60-min | 0.00% | 49% | 595 |
| to close | +0.05% | 55% | 591 |
| Middle 50% of NGG reactions | -0.10% to +0.15% |
|---|---|
| Median reaction (30-min) | +0.01% |
| Measured reactions | 597 |
Half of all National Grid Transco, PLC National Grid PLC (NEW) American Depositary Shares news events land between -0.10% and +0.15% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How NGG reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 25 | +0.03% | 60% | +0.16% |
| Analyst downgrades | 28 | -0.11% | 43% | -0.44% |
| Rating reiterations | 13 | -0.01% | 39% | -0.05% |
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 NGG ranks against every other measured name →
That’s how NGG usually reacts — get an email when it moves on news →Email me when NGG moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to NGG's baseline. Nothing else.
Recent NGG events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Inaugural Power Acceleration Index Announced by GridCARE Identifies Over $300 Billion in Value within the Existing Grid | Press release | Business Wire | -0.02% | +0.14% | |
| Form 6-K NATIONAL GRID PLC For: Oct 05 | SEC filing · Form 6-K | SEC EDGAR | -0.45% | +0.10% | |
| Form 6-K NATIONAL GRID PLC For: Sep 30 | SEC filing · Form 6-K | SEC EDGAR | -0.39% | -0.73% | |
| 2026 Utility Innovation Survey: Industry leaders turning more to AI as data-center boom reshapes grid planning | Press release | PR Newswire | +0.13% | +0.13% | |
| Terragrit Secures Strategic Investment from National Grid Partners to Advance Operational Decision-Making Across Energy and Utilities | Press release | PR Newswire | +0.17% | +0.82% | |
| New Study Finds Transmission Can Save Electricity Customers up to $15.3 Billion While Powering America's Economic Growth and Strengthening National Security | Press release | PR Newswire | +0.04% | +0.19% | |
| Form 6-K NATIONAL GRID PLC For: Aug 28 | SEC filing · Form 6-K | SEC EDGAR | -0.26% | -0.71% | |
| Form 6-K NATIONAL GRID PLC For: Aug 03 | SEC filing · Form 6-K | SEC EDGAR | -0.24% | +0.20% | |
| Form 6-K NATIONAL GRID PLC For: Jul 31 | SEC filing · Form 6-K | SEC EDGAR | -0.29% | -0.48% | |
| Form 6-K NATIONAL GRID PLC For: Jul 23 | SEC filing · Form 6-K | SEC EDGAR | +0.57% | +1.07% | |
| Form 6-K NATIONAL GRID PLC For: Jul 22 | SEC filing · Form 6-K | SEC EDGAR | -0.23% | +0.19% | |
| Form 6-K NATIONAL GRID PLC For: Jul 14 | SEC filing · Form 6-K | SEC EDGAR | -0.01% | -0.11% | |
| Form 6-K NATIONAL GRID PLC For: Jul 01 | SEC filing · Form 6-K | SEC EDGAR | -0.33% | -1.46% | |
| National Grid Ventures to invest $1.75bn to accelerate power solutions for U.S. data centers and AI | Press release | PR Newswire | -0.33% | -1.46% | |
| Form 6-K NATIONAL GRID PLC For: Jun 30 | SEC filing · Form 6-K | SEC EDGAR | -0.41% | -0.47% | |
| National Grid Celebrates 17-Year Partnership with ISN® | Press release | GlobeNewswire | +0.17% | +0.89% | |
| Form 11-K NATIONAL GRID PLC For: Dec 31 | SEC filing · Form 11-K | SEC EDGAR | +0.12% | +0.78% | |
| Form 8-A12B NATIONAL GRID PLC | SEC filing · Form 8-A12B | SEC EDGAR | +0.04% | +0.21% | |
| Form CERT NATIONAL GRID PLC | SEC filing · Form CERT | SEC EDGAR | +0.09% | +0.16% | |
| Form 6-K NATIONAL GRID PLC For: Jun 09 | SEC filing · Form 6-K | SEC EDGAR | -0.20% | -0.30% | |
| Form 6-K NATIONAL GRID PLC For: Jun 04 | SEC filing · Form 6-K | SEC EDGAR | -0.03% | -0.16% | |
| Form 20-F NATIONAL GRID PLC For: Mar 31 | SEC filing · Form 20-F | SEC EDGAR | +0.43% | -0.91% | |
| Form 6-K NATIONAL GRID PLC For: Jun 03 | SEC filing · Form 6-K | SEC EDGAR | +0.33% | -1.22% | |
| National Grid PLC Announces Annual Financial Report and Notice of AGM | Press release | ACCESS Newswire | -0.03% | -1.28% | |
| Form 6-K NATIONAL GRID PLC For: May 29 | SEC filing · Form 6-K | SEC EDGAR | -0.35% | -1.06% | |
| Form 6-K NATIONAL GRID PLC For: May 14 | SEC filing · Form 6-K | SEC EDGAR | -0.07% | -0.28% | |
| Air Space Intelligence and National Grid Collaborate to Deploy Operational AI to the Electric Grid | Press release | PR Newswire | -0.03% | -0.35% | |
| Form 6-K NATIONAL GRID PLC For: Apr 30 | SEC filing · Form 6-K | SEC EDGAR | +0.14% | +1.56% | |
| Form 6-K NATIONAL GRID PLC For: Apr 13 | SEC filing · Form 6-K | SEC EDGAR | -0.26% | -0.60% | |
| Form 6-K NATIONAL GRID PLC For: Mar 31 | SEC filing · Form 6-K | SEC EDGAR | -0.11% | -0.13% | |
| GridCARE and National Grid Collaborate to Unlock Grid Capacity for Infrastructure | Press release | Business Wire | -0.19% | +0.18% | |
| Form 6-K NATIONAL GRID PLC For: Mar 02 | SEC filing · Form 6-K | SEC EDGAR | -0.11% | +0.82% | |
| Form 6-K NATIONAL GRID PLC For: Feb 27 | SEC filing · Form 6-K | SEC EDGAR | -0.15% | -0.22% | |
| Form S-8 NATIONAL GRID PLC | SEC filing · Form S-8 | SEC EDGAR | +0.06% | +0.89% | |
| Form 6-K NATIONAL GRID PLC For: Jan 30 | SEC filing · Form 6-K | SEC EDGAR | +0.00% | +0.06% | |
| Form 6-K NATIONAL GRID PLC For: Jan 23 | SEC filing · Form 6-K | SEC EDGAR | -0.14% | +1.00% | |
| Form 6-K NATIONAL GRID PLC For: Jan 14 | SEC filing · Form 6-K | SEC EDGAR | -0.20% | +1.10% | |
| Form 6-K NATIONAL GRID PLC For: Jan 12 | SEC filing · Form 6-K | SEC EDGAR | -0.39% | +0.06% | |
| Form 6-K NATIONAL GRID PLC For: Dec 31 | SEC filing · Form 6-K | SEC EDGAR | -0.18% | -0.32% | |
| Form 6-K NATIONAL GRID PLC For: Dec 11 | SEC filing · Form 6-K | SEC EDGAR | +0.08% | +0.36% | |
| Form 6-K NATIONAL GRID PLC For: Dec 04 | SEC filing · Form 6-K | SEC EDGAR | -0.12% | -0.45% | |
| National Grid Launches AI-Powered Wildfire Risk Initiative with Rhizome | Press release | PR Newswire | -0.07% | -1.14% | |
| Form 6-K NATIONAL GRID PLC For: Nov 28 | SEC filing · Form 6-K | SEC EDGAR | -0.11% | +0.42% | |
| Form 6-K NATIONAL GRID PLC For: Nov 25 | SEC filing · Form 6-K | SEC EDGAR | -0.11% | +1.10% | |
| Form 6-K NATIONAL GRID PLC For: Nov 17 | SEC filing · Form 6-K | SEC EDGAR | +0.01% | -0.01% | |
| National Grid Partners with Local Food Banks to Provide Funding for Families Facing Food Insecurity | Press release | PR Newswire | -0.18% | +0.14% | |
| Form 6-K NATIONAL GRID PLC For: Nov 06 | SEC filing · Form 6-K | SEC EDGAR | +0.18% | +0.25% | |
| Form 6-K NATIONAL GRID PLC For: Sep 30 | SEC filing · Form 6-K | SEC EDGAR | +0.18% | +0.25% | |
| Form 6-K NATIONAL GRID PLC For: Oct 31 | SEC filing · Form 6-K | SEC EDGAR | -0.21% | -0.09% | |
| National Grid Employees Unite for First-Ever Global Day of Service, Making a Difference in Local Communities in the U.S. and U.K. | Press release | PR Newswire | -0.10% | +0.36% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the NGG section they belong to.
Where else NGG is measured.
NGG earnings → · Analyst actions → · SEC filings →
Other Utilities names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| Huaneng Power Intl (HNP) | 615 | 0.00% | 48% |
| FirstEnergy Corp. (FE) | 598 | -0.04% | 46% |
| California Water Service Group (CWT) | 572 | -0.07% | 46% |
| CPFL ENERGIA (CPL) | 555 | 0.00% | 45% |
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 Utilities names, measured the same way →
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Every name we’ve measured, in one place.
How the numbers are made.
How is National Grid Transco, PLC National Grid PLC (NEW) American Depositary Shares's median reaction calculated?
Every labeled NGG 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 597 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 NGG'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 NGG'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.