Understanding the nuances of VaR for small firms
I'm still grappling with the practical application of Value at Risk (VaR) in our context, specifically for a smaller operation that doesn't have the sophisticated modeling capabilities of a bulge bracket. We're primarily looking at market risk for a limited portfolio of $EURUSD and $GBPUSD spots and short-dated options, and I've been running basic historical VaR calculations. My main struggle is around interpreting the 'horizon' and 'confidence level' in a way that is genuinely actionable for daily risk limits. For example, a 1-day 99% VaR seems intuitively useful for end-of-day checks, but how do more established, similarly sized firms adapt this for intraday risk management, or even for setting broader capital allocations without getting bogged down in overly complex simulations? What are the key practical considerations beyond just the number?
It's a common challenge. For smaller firms, while full-blown Monte Carlo might be overkill, have you considered using a parametric VaR approach, perhaps with some simpler volatility models like EWMA, to capture the time-varying nature of FX risk more effectively than basic historical simulation?