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Scalping

Scalping is an extreme intraday trading strategy where positions are held for very brief periods — often just seconds to a few minutes — with the goal of profiting from tiny price movements (often 1–5 cents per share) and bid-ask spread narrowing. Scalpers typically trade high volumes to build small profits into meaningful returns.

For slightly longer holding periods, see day-trading. For short-to-medium-term, see swing trading. For longer-term trading, see position trading.

How scalping works

A scalper monitors real-time order flow and price:

  1. Identifies a setup. A stock with tight bid-ask spread, high volume, and visible imbalances in buying/selling pressure.
  2. Enters quickly. Buys 100 shares at $50.01 (the ask), hoping for an immediate uptick.
  3. Exits fast. If the stock ticks to $50.03, sells at $50.02 (the bid), capturing a $0.01 gain, or $1 total on 100 shares.
  4. Repeats. Executes 50–100+ of these trades daily, accumulating small gains.

The math: If a scalper executes 100 trades daily with a $0.50 average profit per trade, that’s $50 of gross profit daily. Minus commissions and slippage, net might be $20–30 daily, or $5,000–7,500 monthly.

Challenges

  1. Commissions and spreads. Even with zero-commission brokers, bid-ask spreads are a direct cost. In a $50 stock, a 1-cent spread = 0.002% per round-trip. Do 100 trades and you’ve lost 0.2% of capital.
  2. Slippage. The stock you want to buy at $50.01 may be $50.02 by the time your order fills; the stock you want to sell at $50.02 may be $50.01. Slippage compounds.
  3. Leverage risk. Many scalpers use leverage (margin) to amplify profits. A 2:1 leverage scalping strategy that loses money is doubly painful.
  4. Technology cost. Professional scalping requires real-time data, direct market access, advanced charting, and fast internet — costs of $100–500+ monthly.
  5. Psychological stress. The intense focus required and the frequency of micro-losses is mentally exhausting.
  6. Regulatory timing. Data latency, order routing, or system delays can turn a winning scalp into a loss.

Institutional versus retail scalping

Institutional scalping (used by proprietary traders and market makers) is profitable because they have:

  • Microsecond-speed technology and proprietary order-routing.
  • Co-located servers at exchanges for minimal latency.
  • Zero or negative commissions (they provide liquidity and earn rebates).
  • Capital and risk management resources.

Retail scalping faces all the costs and none of the advantages, making it nearly impossible to be profitable.

See also

Wider context