Wall Street Enters Darker Age With Most Stock Trading Now Hidden

Posted: Jan 24, 2025

  • Majority of US stock trading now happening outside of public exchanges, at 51.8% in January
  • Off-exchange activity includes trading internally at firms or in dark pools
  • Increased off-exchange trading could impact pricing and market efficiency
  • SEC trying to push more activity back to exchanges with new rules
  • Off-exchange trading surge corresponds with increased volume in stocks worth less than $1
  • Alternative-trading systems growing, allowing institutional investors to limit information leakage
  • About 1.7 billion shares a day changed hands on an ATS in November, up 36% from a year prior
  • Larger institutions seem to benefit more from off-exchange trading
  • SEC proposes major changes to stock trading, biggest since 2005
  • Aim is to improve prices for investors and drive business to traditional exchanges
  • Four proposals laid out by SEC Chair Gary Gensler
  • Changes would impact order routing, pricing, and broker disclosures
  • Plan expected to face industry pushback before finalization




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