Which are large stocks and mega caps

Screening Filters

1. Market Cap ≥ $150,000,000,000 (≥ $150B)

   • Purpose: Isolate the very largest companies in the market.
   • Rationale:
     • “Mega cap” is commonly defined as roughly $200B+ and “large cap” starts around $10–$20B, but setting the floor at $150B essentially captures only the biggest, most established companies.
     • This aligns directly with your request for “the largest stocks and mega caps”, excluding mid-caps and most standard large caps.

2. Share Price ≥ $10

   • Purpose: Avoid very low-priced or “penny-like” stocks.
   • Rationale:
     • True mega caps almost never trade in the low single digits for long; a 150B+ company with a sub-10 stock price would be extremely unusual or distressed.
     • This filter is mostly a quality/cleanliness filter to keep out any odd edge cases and make sure results look like typical blue-chip names.

3. Monthly Average Dollar Volume ≥ $3,000,000

   • Purpose: Ensure the stocks are liquid and actively traded.
   • Rationale:
     • Large and mega cap stocks are usually highly liquid; adding a volume threshold makes sure the results are easy to trade and not obscure illiquid listings.
     • This supports your intent of focusing on major, investable U.S. stocks, not just technically large but thinly traded names.

4. Index Membership: S&P 500 (GSPC) or Nasdaq 100 (NDX)

   • Purpose: Restrict results to the most important benchmark U.S. stocks.
   • Rationale:
     • The S&P 500 (GSPC) and Nasdaq 100 (NDX) are the primary large-cap indices in the U.S.
     • Almost all U.S. mega caps are members of at least one of these indices.
     • This ensures the screen returns core index constituents, which investors typically mean when they talk about “the largest U.S. stocks.”

5. Exchange Listing: XNYS, XNAS, XASE (NYSE, Nasdaq, NYSE American)

   • Purpose: Limit to U.S.-listed securities on major exchanges.
   • Rationale:
     • Your question is specifically about “the US stock market”, so this filter excludes OTC, foreign-only, or non-U.S. exchanges.
     • NYSE and Nasdaq together host virtually all U.S. mega caps; including NYSE American covers a few additional U.S. listings.

Why the Results Match Your Question

• By setting market cap ≥ $150B and restricting to S&P 500 / Nasdaq 100 constituents on major U.S. exchanges, the screen focuses squarely on the largest and mega-cap U.S. stocks.
• Liquidity and price filters ensure these are practical, blue-chip type names that are widely followed and easily tradable, matching what investors generally mean by “largest stocks in the U.S. market.”