SPAN and exposure margin, intraday leverage limits and why leverage magnifies process errors more than returns.
Key takeaways
- Derivatives margins are set by exchange SPAN plus exposure requirements, not by the broker's generosity.
- Leverage multiplies both edge and error; it does not create edge.
- Margin shortfalls trigger penalties and forced square-offs at market prices.
Margin is the collateral the exchange requires to hold a derivative position. It has two components: SPAN, calculated from a risk model on the portfolio, and an exposure margin on top. Hedged positions require less because their risk is lower — a fact worth exploiting deliberately.
Intraday leverage in cash equity is regulated and far lower than it was a decade ago. That change removed a lot of retail accounts from the market, but it also removed the mechanism that destroyed them.
The key mental model: leverage does not improve your strategy. If your process produces a 1% monthly edge, five times leverage produces roughly five times the edge and five times the drawdown — and your tolerance for the drawdown, not the edge, is what decides whether you stay solvent.
Watch margin shortfalls. If a position's margin requirement rises intraday and your account cannot cover it, penalties apply and the broker may square off at whatever price exists. Keep a buffer of unused margin as a policy, not an accident.
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