Talen Energy (TLN) Surges 3.43% on $250M Volume, Ranks 440th in Daily Trading Activity

Talen Energy (TLN) closed on October 8, 2025, with a 3.43% gain, trading on a volume of $0.25 billion, which ranked it 440th among listed stocks that day. The move followed a series of strategic updates and operational developments reported by the company, focusing on its renewable energy expansion and production efficiency initiatives.

Recent disclosures highlighted Talen’s progress in integrating advanced solar and storage solutions into its grid infrastructure, aligning with broader market trends toward decarbonization. Analysts noted that the company’s updated guidance for 2026, emphasizing cost optimization and capacity utilization, reinforced investor confidence in its long-term operational resilience.

To run this back-test properly, I need to pin down a few implementation details: Market universe—should we screen all U.S. listed common stocks, or a narrower universe (e.g., S&P 1500, Russell 3000, etc.)? Weighting & trading mechanics—equal-weight each of the 500 names? Enter at today’s close and exit at tomorrow’s close (1-day holding period)? Practical settings—slippage/transaction costs—apply any, or ignore? Any risk controls (max position size, etc.)? If reasonable defaults are acceptable, I can assume: universe as all U.S. common stocks continuously traded since Jan 2022; equal weighting; buy at close, sell at next day’s close; no transaction costs or risk controls. Let me know if adjustments are needed before proceeding with the back-test.