What are the biggest gainers today?

Screening Filters

1. Market Cap ≥ $300,000,000

   • Purpose: Focus on established companies rather than tiny micro-caps.
   • Rationale: Many of the “biggest gainers” by percentage are very small, speculative companies that can move wildly on tiny volumes. Setting a $300M minimum market cap keeps the list tilted toward more substantial, widely followed businesses where big moves are more meaningful and less likely to be pure noise.

2. Monthly Average Dollar Volume ≥ $500,000

   • Purpose: Ensure the stocks are liquid and actively traded.
   • Rationale: A name can show a large percentage gain on a handful of shares; that’s not very relevant for most investors. Requiring a minimum average trading value of $500k per month helps filter out illiquid names and highlights gainers where real money is trading hands.

3. Price ≥ $2

   • Purpose: Exclude penny stocks.
   • Rationale: Very low‑priced stocks often have extreme percentage moves that don’t reflect the kind of “big gainers” most investors are interested in (and may also be subject to manipulation). A $2 price floor helps focus on more conventional listings and reduces distorted results from sub‑$1 or very low‑priced tickers.

4. Price Change % (Today) ≥ 5%

   • Purpose: Capture only stocks with a clearly significant move up today.
   • Rationale: To find the “biggest gainers,” we need a threshold that defines a notably strong move. A 5% minimum daily gain removes marginal movers (+1–2%) and gives a pool of stocks that truly stand out on the day. Within that pool, you’d typically sort by percentage gain to see the very top performers.

5. Region = United States

   • Purpose: Restrict to US‑domiciled stocks.
   • Rationale: The question is about the “US stock market,” so we limit to companies listed in or associated with the US, rather than including foreign markets.

6. Exchange in [XNYS, XNAS, XASE] (NYSE, NASDAQ, NYSE American)

   • Purpose: Focus on major US exchanges.
   • Rationale: These are the primary US stock exchanges most investors mean by “the US stock market.” This avoids OTC and other non‑primary venues where reporting, liquidity, and price behavior can be less reliable.

Why Results Match

• The US focus (region + major exchanges) aligns directly with “US stock market.”
• The price change filter (≥ 5%) targets genuine “big gainers” on the day.
• The market cap, liquidity, and price floors keep out illiquid penny stocks and micro‑caps, so the resulting list highlights meaningful, tradable winners rather than obscure tickers with misleading spikes.