I was really hoping to quit this thread, but I keep getting sucked back in.
Following up on the trades luvb2b poster earlier, here's a snapshot of today's trades that makes it a little easier to understand (at least for me):
These are all trades of 100 contracts or more on the PHLX exchange during a few blocks of time when this trader appeared to be active (all times are in PDT):
The morning block (8:28am - 8:37am):
View attachment 20215
The afternoon blocks (Block A from 12:17pm - 12:19pm, and Block B from 12:38pm - 12:43pm):
View attachment 20217
So a few observations that I continue to see.
The trades in the morning block and the afternoon "B" block are always in pairs of the same contract size. This is highly unusual. Why execute trades of the same size within seconds of each other at the same price? Not enough bid/ask to fill the order? Seems dubious, since it is filled seconds later. Would love to hear theories...
The other oddity I noticed is many trades are marked with a spread condition (one even is marked as a straddle), yet there is no pairing transaction to be found. So this trader is using spread/straddle conditions on their orders, but not executing spread/straddle trades. Very odd....
Now the afternoon "A" block of trades is different. Here you have trades across multiple dates and strikes being executed within minutes of each other. Most of these trades were not executed in multiples of 10/50/100/etc. either, unlike the other blocks of trades. They are not paired, there is one order for each date/strike price combination.
Ok, now I give up...