Smart position sizing & risk management

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Market Structure

Portfolio

The collection of all investments (stocks, ETFs, options, cash) held in your trading or brokerage account.

What is a Portfolio?

Your portfolio is everything you hold in your brokerage account: stocks, ETFs, options, bonds, and cash. It is the total picture of your investments at any point in time.

Portfolio for day traders vs investors

  • Day traders: portfolio changes constantly throughout the day. May start and end each day in 100% cash with no overnight positions
  • Swing traders: hold a handful of positions for days or weeks. Portfolio turns over regularly but not daily
  • Investors: hold positions for months or years. Portfolio changes slowly

Key portfolio concepts

  • Diversification: spreading money across different stocks, sectors, or asset types to reduce risk. If one position drops, it does not wipe out your entire account
  • Concentration: putting a large percentage of your portfolio into a single stock or sector. Higher risk, higher potential reward
  • Portfolio heat: the total percentage of your portfolio at risk across all open positions. If you risk 2% per trade and have 5 trades open, your portfolio heat is 10%
  • Cash allocation: the percentage of your portfolio sitting in cash. Higher cash means less market exposure and lower risk
Day traders often end each day with a 100% cash portfolio. This eliminates overnight risk from earnings, news, or gap downs that happen while you cannot trade.