Big gainers today

Screening Filters

1. price_change_pct: { min: 5 }

   • Purpose: Include only stocks that are up at least +5% today.
   • Rationale:
     • Your request is to find stocks with the largest gains today. Those names are typically the ones with outsized daily percentage moves.
     • Setting a minimum price change of +5% acts as a first cut to capture significant gainers and remove the bulk of the market that moved only slightly (e.g., +0.5%, +1%).
     • While this doesn’t rank stocks from highest to lowest gainer by itself, it narrows the universe to meaningful winners that are directionally in line with “largest gains.”

2. list_exchange: ['XNYS', 'XNAS', 'XASE']

   • Purpose: Limit results to stocks listed on the major US exchanges:
     • XNYS = NYSE
     • XNAS = NASDAQ
     • XASE = AMEX
   • Rationale:
     • You specifically asked for the US stock market, and these three are the primary US equity exchanges.
     • Excluding OTC, pink sheets, and foreign exchanges helps ensure you’re seeing more established and better-regulated US-listed companies, which is usually what people mean by “US stock market.”
     • This keeps out illiquid or very speculative OTC names that can show extreme moves but may not be what you’re looking for when you say “largest gains in the US market.”

Why Results Match:

• The exchange filters align directly with your request by restricting the universe to US-listed stocks on the main exchanges.
• The +5% minimum daily gain filter is a practical way to surface top gainers or near-top gainers; it focuses on stocks that have had unusually strong performance today.
• While the screener may not explicitly pull the single “top” gainer, it effectively identifies the segment of the market experiencing the largest positive moves today, which matches the intent of your question.