Alphabet Slides 0.46% with $5.26B Volume, Ranking 12th in U.S. Trade Amid Regulatory and Sector Shifts

Alphabet (GOOGL) closed lower by 0.46% on October 8, 2025, with a trading volume of $5.26 billion, ranking 12th among U.S. stocks. The decline followed mixed market sentiment amid evolving regulatory scrutiny and shifting investor preferences in the tech sector.

Analysts noted that the stock's performance remained sensitive to broader macroeconomic signals, including interest rate expectations and sector rotation trends. While Alphabet's core advertising revenue streams showed resilience, near-term volatility persisted due to ongoing antitrust litigation and competition from emerging AI platforms.

To run this back-test rigorously I need to clarify two practical points:

1. Universe & data source

- Do you intend the entire U.S. listed equity universe (common shares on NYSE + NASDAQ), or a narrower list (e.g. only S&P 500 constituents)?

2. Weighting & execution price

- Typical daily-rebalanced implementations buy the 500 names with the highest same-day dollar volume at that day’s close and sell them at the next day’s close, with equal weight (1/500 each).

- If this matches your intent I can proceed; otherwise please specify any different weighting or the use of open prices instead of closes.

(Our back-testing engine supports single-instrument or index series. For a cross-sectional strategy we’ll first construct an equal-weighted daily return series for the “Top-500-by-Volume” basket and then feed that series into the engine.)

Let me know if the above assumptions are acceptable or if you’d like any adjustments before I start the data pull and computation.