Constellation Energy (CEG) Stock This Week: Calpine Deal Nears Closing, Nuclear “Data Economy” Tailwinds, and What Investors Watch Next Week (Updated Dec. 12, 2025)
Updated: December 12, 2025Company / Ticker: Constellation Energy Corporation (NASDAQ: CEG) Constellation Energy (CEG) ended the week on a dramatic note, sliding to $351.98 at Friday’s close after a sharp intraday reversal that took the stock from an early surge to a steep selloff. CEG opened at $379.00, traded as high as $380.78, then dropped to $351.22 before closing down 7.03% on the day, with volume around 3.78 million shares. Investing.com That one-session swing capped a volatile five-day stretch in which Constellation’s stock climbed into Thursday’s close—then abruptly gave back gains on Friday. From Monday (Dec. 8) close of $357.67