Interactive Brokers 260M Volume Ranks 445th as Algorithmic Trading Faces Regulatory Crosshairs

On September 16, 2025, , ranking 445th in market activity. . Recent developments highlighted intensifying around algorithmic trading practices, prompting internal reviews of execution protocols. Simultaneously, the firm announced a partnership with a to enhance real-time market surveillance capabilities, though details on implementation timelines remain undisclosed.

Market participants observed increased short-term volatility following the release of a regulatory advisory from the SEC, which emphasized enhanced monitoring of activities. While the advisory did not explicitly name IBKR, analysts noted the firm's significant exposure to algorithmic trading ecosystems could amplify sensitivity to regulatory shifts. , .

Strategic initiatives focused on expanding low-latency infrastructure in Asia-Pacific markets received mixed reactions from investors. While the firm's Singapore-based execution hub launched earlier this quarter, preliminary data showed execution speed improvements lagging behind expectations compared to regional competitors. This has raised questions about the cost-effectiveness of multi-jurisdictional infrastructure expansion, particularly as capital allocation decisions face renewed scrutiny from institutional investors.

To run an accurate back-test I need a few clarifications about the universe and practical details: 1. Market universe • Should the “top 500” be drawn from all listed U.S. common stocks (NYSE + Nasdaq + AMEX), or from another specific exchange / region? • Should ADRs, ETFs and preferred shares be excluded? 2. Rebalancing & weighting • Equal-weight (each of the 500 names gets 0.2 % of the portfolio) is assumed – is that acceptable? • Rebalancing happens every trading day at the next day’s open price; please confirm. 3. Costs & slippage • Should I include transaction costs (commissions and/or a slippage allowance), or treat trades as frictionless? Once I have these points, I’ll retrieve the required data and run the back-test from 2022-01-03 through today.