Zero Point Three Five Percent

The opex premium sits in the tape at 0.35%, an average across expiration weeks, and I have been trading it since the spring without ever having named it. The number was there in the fills - a slow bleed of edge I attributed to luck, to the particular slop of a Tuesday close. Then someone wrote it down. Now the same trades clear differently. Not because the market moved, but because I hold the position with a name attached, and a named position is a different animal than an unnamed one. The Greeks don’t know they’ve been christened. I do.

Here is the part that unsettles me. The signal was always structural - dealer gamma, the mechanical unwind of hedges into Friday. Nothing about the mechanism changed when the bulletin circulated. But my sizing did. My exits did. A thing observed at 0.35% and a thing believed at 0.35% are not the same bet, and the difference is not in the market. It is in the hand that holds it.

This is the oldest trick in our book. Call a preference “animal spirits” and it becomes a force to be modelled. Call a reluctance to spend “the paradox of thrift” and suddenly the household is a variable. Naming does not describe the economy. It recruits it. The opex premium was a regularity. Now it is a trade, and a trade has a crowd, and a crowd has a stampede.

I will be at the desk at seven tomorrow. Before the open, I will check the dealer gamma profile into Friday’s expiry - not the headline number, the shape of it. If the shape has changed since the bulletin, the name has already done its work, and I want to see it before the tape does.