The S&P dealer position has flipped into OPEX

The S&P dealer position has inverted, and that changes what the drift into OPEX usually looks like.

Here's the mechanic in normal times.

Dealers are long upside and short downside. They hold a short futures position against that book. As time passes and those options decay, the deltas collapse, and the dealers buy those short futures back gradually. That steady buying is a big part of why the market so often grinds higher into a major expiry.

That's the usual story. Buying pressure into OPEX from mechanical dealer hedge unwinds.

Right now the book has flipped.

The relentless rally we've had blasted clean through all the long call strikes. Positions that were dealer longs became became downside as spot ran through them. The street is now short gamma on the upside and long gamma on the downside. That's the mirror image of the normal book.

Which means the dealer futures position is now a long. As time passes and the deltas decay, the dealers need fewer of those long futures. They become a net seller into the expiry.

So the same mechanism that usually pulls the market up into OPEX should be doing the reverse this time. Pushing it gently down, or at least keeping a lid on the rally.

The downside is well supported, mind you.

There's something like $10 billion of long gamma sitting under this market. That's a decent amount of dealer inventory that has to be delta-hedged as spot moves. When spot dips, dealers buy. When it bounces, they sell a little. That mechanical two-way flow is why the last few days of selling have been a slow dribble. The long gamma cushion turns any sharp move into a gradual grind.

So the setup into this expiry has an odd combination. Supported below by the long gamma. Heavy into expiry from the inverted book creating negative CHARM.

Rally without follow-through, sell-off without violence. That's the shape of what the mechanics are producing.

For me, that's a setup where the interesting trade sits in the shape the plumbing is creating rather than in a directional call. The tape is going to move a little, both ways, without going far in either direction. That's a specific pattern with specific structures that fit it.

Reading which side of the OPEX drift the dealer book is set up for is exactly the kind of institutional read that separates a positioning trade from a chart trade.

Where to start deepening your knowledge? The framework I built across 20 years on bank options desks is available below.

Watch my free masterclass (exclusive for serious option traders)

The bigger lesson beyond this specific setup.

The drift-into-OPEX pattern is a mechanic that depends on conditions. It works when the dealer book has the normal shape. It is less reliable when the book flips.

Right now the OPEX condition is inverted. The pattern is going to try to run in reverse. That's the setup worth positioning around, provided you know the difference.

If you want to skip the masterclass and jump straight into our course, the Options Insight Advantage, this is the link.

Jump straight into our course, the Options Insight Advantage