Meta's $8.25 Billion Slide to Eighth in Trading Volume Amid Regulatory and AI Cost Pressures
Meta (META) fell 1.28% on Sept. 23, , ranking eighth in market activity. The decline came amid mixed signals from its core business segments and regulatory headwinds.
, a key growth market. While the company maintained strong engagement metrics on its platforms, analysts noted a slowdown in monetization efficiency as user growth plateaued in mature markets. The stock also faced pressure from broader concerns over AI development costs, .
Regulatory challenges intensified following a European Commission investigation into alleged anti-competitive practices in its ad tech division. The probe, which could lead to significant compliance costs, added to investor skepticism about near-term profitability. However, the company emphasized progress in its Reality Labs division, .
To run this back-test rigorously I need a few extra details that weren’t specified explicitly: 1. Universe • Should we use all U.S. common stocks (NYSE + NASDAQ + AMEX)? • Or a different universe (e.g., only S&P 1500 constituents, only China A-shares, etc.)? 2. Pricing convention & holding-period return • Buy at today’s close and sell at tomorrow’s close (close-to-close)? • Buy at tomorrow’s open and sell at tomorrow’s close (open-to-close)? • Something else? 3. Weighting & capital allocation • Equal-weight across the 500 names (default)? • Value-weight by dollar volume? • Another scheme? 4. Transaction assumptions • Ignore trading costs and slippage (default), or apply a commission/slippage estimate? 5. Risk control • Any stop-loss, take-profit, or maximum holding-days rules besides the 1-day hold? If you’re happy with the default assumptions (U.S. listed equities, equal-weight, close-to-close returns, no transaction costs, no extra risk controls), just let me know and I’ll proceed; otherwise please specify your preferences.

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