Quant Memo
Core

Getting Your Risk Limit Back

The desk practice of restoring a trader's risk limit gradually after a drawdown or a cut, tied to demonstrated performance rather than handed back all at once.

When a trader hits a drawdown, desks typically cut their risk limit — the maximum position size or capital-at-risk they're allowed — as an automatic circuit breaker. What happens next is less mechanical: the limit isn't usually restored in one step once the trader stops losing money. Instead it's rebuilt gradually, in stages, tied to a track record of steady performance at the reduced size. This is sometimes called "earning your risk back."

The logic is asymmetric on purpose. A trader who just lost money has, at minimum, an open question about whether their edge or their risk controls are working as expected, and a string of good days at reduced size is weaker evidence of a fixed process than the same string would be at full size. Restoring the limit in steps — say, 25% of the cut back after two weeks of controlled performance, another chunk after a month — gives the desk multiple checkpoints to reverse course before a trader is back to full size and able to re-create the original drawdown.

Worked example

A trader's $10m limit is cut to $4m after a 6% drawdown. Under a typical staged rebuild, the desk restores $2m after two weeks of flat-to-positive P&L within the reduced limit, then another $2m after a further month, reaching $8m only after roughly six weeks of demonstrated discipline — with the final $2m held back pending a full review of what caused the original drawdown.

Risk limits cut after a drawdown are typically restored gradually and conditionally on sustained performance, not returned all at once — giving the desk repeated checkpoints to catch a recurring problem before a trader is back to full size.

Practice in interviews

Further reading

  • Desk practice; see also Kelly-based drawdown sizing
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