As we stare into how the day is going to unfold, here is an update on the delta hedge inventory. The hedge need estimate (Using 60% or raw numbers below) is a bit shy of 150 million shares (corresponding to the 245 million number today in the table below)
While this is high, we have seen higher levels. This was as high as 290 million raw hedge need, right after the announcement of the stock split. So 245 million is not off the charts number, and we will perhaps hit that threshold if we see prices around 800.
Interesting to note that almost 50% of the gamma (increasing delta with price phenomenon) is from options expiring today (~35 percentage points) and next week (~14 percentage points). As holders of these options sell, that should provide some additional liquidity to the index buyers. I'd say these option holders are well positioned to profit off and provide liquidity at the same time. They represent anywhere from 21 to 36 million shares (net) in at prices ranging from here to 800 (raw numbers would be 35 to 60 million). As a bonus I am also publishing the hedge need by expiry for large moves as things stand today.
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Want to make this a separate post as its an important takeaway. There will be a lot of options unwinding going on during the day. Options cannot be closed on a cross like shares, as far as I can tell. There will be a need for this delta inventory to be absorbed by day traders who will be looking to unload into the closing cross. Again this will induce volatility during the day if we don't have enough front runners. This also means there will be insufficient inventory at the cross, with action spilling over into next week. Brace yourself for a volatile day.