Constellation Energy Corporation - When-Issued (CEG)
CEG moved a median of +0.12% 30 minutes after news, and +0.23% by the close. How CEG actually reacts to news — the realized, point-in-time move the market made, measured across 307 labeled events over the last three years with zero look-ahead.
CEG’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | +0.04% | 52% | 307 |
| 30-min | +0.12% | 58% | 307 |
| 60-min | +0.41% | 62% | 307 |
| to close | +0.23% | 55% | 306 |
| Middle 50% of CEG reactions | -0.34% to +0.86% |
|---|---|
| Median reaction (30-min) | +0.12% |
| Measured reactions | 307 |
Half of all Constellation Energy Corporation - When-Issued news events land between -0.34% and +0.86% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How CEG reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 10 | +1.39% | 100% | +0.59% |
| Coverage initiations | 27 | -0.15% | 37% | +0.68% |
| Rating reiterations | 95 | -0.08% | 46% | -0.29% |
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 CEG ranks against every other measured name →
That’s how CEG usually reacts — get an email when it moves on news →Email me when CEG moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to CEG's baseline. Nothing else.
Recent CEG events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Google and Constellation Announce Landmark Agreement to Bring 890 MW of New Nuclear Capacity to PJM Grid as Part of Long-Term Power Deal | Press release | Business Wire | +3.08% | +2.67% | |
| Constellation and Amazon Announce 20-Year Power Purchase Agreement Adding 190 Megawatts of Nuclear Capacity at Calvert Cliffs | Press release | Business Wire | +2.01% | -0.80% | |
| Fluxnium Secures $7 Million Seed Round to Build a New Domestic Supply of Uranium | Press release | PR Newswire | -0.25% | +2.60% | |
| Constellation to Acquire Rhode Island State Energy Center (RISEC) from Shell | Press release | Business Wire | +0.08% | -0.70% | |
| Data Centers Are Running Out of Power — And Behind-The-Meter Generation Could Be the Answer | Press release | GlobeNewswire | +1.68% | +2.18% | |
| Constellation Reports Second Quarter 2026 Results | Press release | Business Wire | -2.91% | -6.05% | |
| Constellation Announces Board Chairman Transition and New Board Appointment | Press release | Business Wire | +0.07% | -0.23% | |
| Form 8-K Constellation Energy For: Aug 04 | SEC filing · Form 8-K | SEC EDGAR | -0.01% | -0.23% | |
| Constellation Energy Corporation Declares Dividend | Press release | Business Wire | -0.19% | +0.38% | |
| Blue Energy Receives Strategic Investment from Constellation to Accelerate Commercialization of Novel Shipyard Manufacturing and Project Financing Model for New Nuclear | Press release | PR Newswire | +0.31% | -0.42% | |
| As Canada Highlights Fusion in Its Nuclear Energy Strategy, Shareholders Vote to Take a Fusion Pioneer Public | Press release | Canada Newswire | +0.25% | -1.61% | |
| Constellation Seeks License Renewals for Two New York Units Through 2049 | Press release | Business Wire | +0.11% | +0.08% | |
| From the Lab to the Grid: General Fusion Signs a Framework to Bring Fusion Power to Italy | Press release | Canada Newswire | +0.76% | -0.52% | |
| Constellation Announces Extension of Expiration for Exchange Offers | Press release | Business Wire | +1.52% | -0.48% | |
| Constellation and Walmart Announce Long-Term Agreement to Support Reliable, Emissions-Free Nuclear Energy in Illinois | Press release | Business Wire | +0.26% | +0.21% | |
| AI Bust: The Trillion-Dollar AI Question Nobody's Asking | Press release | Canada Newswire | +1.15% | +1.83% | |
| Form 11-K Constellation Energy For: Dec 31 | SEC filing · Form 11-K | SEC EDGAR | +0.19% | -0.47% | |
| From Cancer Drugs to Kilowatts: A NASDAQ Company's Bet on the AI Power Crunch | Press release | Canada Newswire | +0.43% | +1.57% | |
| THE GEYSERS GEOTHERMAL COMPLEX COMPLETES 25-MEGAWATT EXPANSION PROJECT, STRENGTHENING CALIFORNIA GRID RELIABILITY | Press release | PR Newswire | -1.50% | -1.98% | |
| Form 8-K Constellation Energy For: Jun 01 | SEC filing · Form 8-K | SEC EDGAR | -0.46% | -1.96% | |
| Constellation Energy Corporation Announces Pricing of Secondary Public Offering of Common Stock | Press release | Business Wire | +0.74% | -2.39% | |
| Constellation Energy Corporation Announces Secondary Public Offering of Common Stock | Press release | Business Wire | +0.74% | -2.39% | |
| Constellation and Pine Creek RNG Announce Equity Purchase Agreement in RNG Facilities | Press release | Business Wire | +0.31% | +0.20% | |
| Constellation Reports First Quarter 2026 Results | Press release | Business Wire | -5.14% | -4.87% | |
| Form 8-K Constellation Energy For: Apr 28 | SEC filing · Form 8-K | SEC EDGAR | +1.59% | +3.96% | |
| Constellation Energy Corporation Declares Dividend | Press release | Business Wire | +0.02% | -0.35% | |
| Microreactor Technology Emerging as Strategic Backbone for Next-Generation AI Infrastructure | Press release | Canada Newswire | -1.11% | -2.53% | |
| Form 8-K/A Constellation Energy For: Apr 17 | SEC filing · Form 8-K | SEC EDGAR | -0.90% | -2.61% | |
| Form DEFA14A Constellation Energy | SEC filing · Form DEFA14A | SEC EDGAR | +0.43% | +1.44% | |
| Form 8-K Constellation Energy For: Mar 23 | SEC filing · Form 8-K | SEC EDGAR | +0.89% | +1.89% | |
| Form ARS Constellation Energy For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | -0.02% | -10.22% | |
| Form DEF 14A Constellation Energy For: Apr 02 | SEC filing · Form DEF | SEC EDGAR | -0.02% | -10.22% | |
| Form DEFA14A Constellation Energy | SEC filing · Form DEFA14A | SEC EDGAR | -0.02% | -10.22% | |
| Form S-8 Constellation Energy | SEC filing · Form S-8 | SEC EDGAR | -0.02% | -10.22% | |
| Constellation Announces Agreement to Sell PJM Generation Assets to LS Power as Part of FERC, U.S. DOJ Resolution of Calpine Transaction | Press release | Business Wire | -2.00% | +0.46% | |
| Constellation Reports Fourth Quarter and Full Year 2025 Results | Press release | Business Wire | -0.81% | +5.12% | |
| Form S-3ASR Constellation Energy | SEC filing · Form S-3ASR | SEC EDGAR | +0.84% | -0.28% | |
| Beyond Tech: The Hidden Winners of the AI Energy Boom | Press release | PR Newswire | +0.11% | -0.46% | |
| Form 8-K/A Constellation Energy For: Sep 23 | SEC filing · Form 8-K | SEC EDGAR | +0.58% | +1.46% | |
| Constellation and CyrusOne Announce Agreement to Support New Data Center Facility at Freestone Energy Center in Texas | Press release | Business Wire | +0.40% | +3.80% | |
| Constellation Announces Expiration and Final Results of Private Exchange Offers and Consent Solicitations | Press release | Business Wire | +1.18% | -0.69% | |
| Form S-3ASR Constellation Energy | SEC filing · Form S-3ASR | SEC EDGAR | -1.05% | -4.15% | |
| Constellation Completes Calpine Transaction, Powering America’s Clean Energy Future | Press release | Business Wire | -1.05% | -4.15% | |
| NRC Greenlights Constellation’s $167 Million Digital Modernization Plan for Limerick Clean Energy Center; State-of-the-Art Technology Upgrades Will Enhance Reliability, Diagnostic Capability and Cyber Resilience | Press release | Business Wire | -0.51% | -0.34% | |
| Zero-Carbon Nuclear Power Emerging as a Critical Pillar of the Clean Electricity Market Delivering a Scalable Growth Gateway | Press release | PR Newswire | +0.03% | +0.25% | |
| Constellation Announces Extension of Expiration for Private Exchange Offers and Consent Solicitations and Early Tender Results | Press release | Business Wire | +2.77% | +2.32% | |
| NRC Renews Operating Licenses for Clinton & Dresden; Constellation Investing $370 Million in State-of-the-Art Upgrades to Keep These Illinois Nuclear Facilities Online, Meet Rising Power Demand and Support Economic Growth | Press release | Business Wire | +0.87% | +0.81% | |
| Constellation Wins Platts Global Energy Award for Crane Clean Energy Center Restart | Press release | Business Wire | -0.73% | -7.13% | |
| Constellation Announces Private Exchange Offers and Consent Solicitations for Calpine Corporation Notes | Press release | Business Wire | +0.27% | +0.98% | |
| W. L. Gore & Associates Advances Its Emissions Reduction Efforts with Constellation’s Hourly Carbon-Free Energy Matching Offering | Press release | Business Wire | +0.47% | +0.83% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the CEG section they belong to.
Where else CEG is measured.
CEG earnings → · Analyst actions → · SEC filings →
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How the numbers are made.
How is Constellation Energy Corporation - When-Issued's median reaction calculated?
Every labeled CEG 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 307 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. 58% of CEG'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 CEG'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.