When implied vol ignores a quiet tape
A calm underlying does not always mean cheap options — how we read stubborn implied levels.
Quiet sessions tempt desks to unwind hedges. Sometimes that is correct. Sometimes implied volatility is holding for reasons the cash market will not show until the next event window opens.
What we watch first
We start with the distance between short-dated implied and recent realised. If realised has compressed for several sessions while implied refuses to follow, we ask whether a known print sits nearby, whether dealer inventories look light, or whether a related cross-asset vol surface is already marking higher.
A Bangkok example
During a stretch of muted SET50 spot moves last year, short-dated index option implied stayed elevated relative to the prior month’s realised. The calendar held a cluster of bank earnings. Desks that treated the quiet tape as a signal to sell vol wholesale later paid for gamma they had not budgeted. Those that treated the quiet as incomplete information kept a thinner but deliberate overlay.
Practical takeaway
A quiet tape is evidence about the underlying, not a full verdict on the options surface. Pair realised path with the event calendar and with skew before deciding the hedge is “too expensive to keep.”