BlackRock's $560M Volume Ranks 189th as Shares Dip 0.74% in Volatile Market

On September 15, 2025, , ranking 189th among U.S. equities. , reflecting mixed market sentiment amid evolving investor positioning in the sector.

The decline came as BlackRock navigated a broader selloff in financial services stocks, with analysts noting short-term profit-taking after recent gains. While no company-specific announcements directly impacted the stock, broader macroeconomic concerns—including and central bank policy uncertainty—contributed to the downward pressure. Market participants remain focused on the firm’s exposure to fixed-income markets, where recent have influenced investor behavior.

To run this back-test robustly I need to pin down a few practical details that aren’t specified yet and will directly affect both the data we pull and the way we construct the portfolio: 1. Universe definition • Which market / exchange should we look at when ranking daily trading volume (e.g., all U.S. listed equities on NYSE + NASDAQ, only S&P 500 constituents, etc.)? 2. Weighting of the 500-stock basket • Equal-weight each of the 500 names every day, or weight them by their dollar trading volume, market-cap, etc.? 3. Price type for return calculation • Use the official daily close price (typical) or the next day’s open? 4. Transaction costs and slippage • Assume zero costs (default) or include a per-trade cost? 5. Data volume notice • Calculating top-500 volume leaders for every trading day since 2022 touches many tickers. That’s feasible, but please confirm you’re okay with the larger data pull. Once I have those clarifications I can lay out the exact data-retrieval steps and start the back-test.