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Topic cluster / Signal and portfolio designLearn what a regime filter does, how it changes strategy behavior, and why Alphora treats it as a context layer rather than a standalone alpha claim.
Reviewed by Alphora Research
Updated June 30, 2026
What to remember
A regime filter is not usually a stock-picking signal on its own. It is a classifier or overlay that says the current environment is friendly, hostile, or ambiguous for a downstream strategy.
Instead of asking what to buy or sell directly, it asks whether your core edge is being deployed in conditions where it historically made sense.
For example, a fast mean-reversion strategy can look great in calm tape and terrible in liquidation cascades. A regime filter exists to prevent you from pretending those environments are the same.
A good regime filter should make a strategy more honest, not more mysterious. The output should still be explainable to a skeptical PM or teammate.
Alphora's realized-vol regime page treats regime as a reusable context building block. That means it can gate or resize other strategies, and the examples show how it behaves as a layer in the composition rather than as a standalone return stream.