UPDATE: today (9/30) JPM rolled their collar trade (sell a call to fund a put spread hedge) to:
Sell 45,000 contracts of the Dec 31st 4505 calls at a delta of 34
Buy 45,000 of the Dec 31st 4135 puts at a delta of 30
Sell 45,000 of the Dec 31st 3480 puts at a delta of 7.
The net of this trade is a negative delta of ~57 (34+30-7). You can see the impact of this trade in the image below. The top chart is the ES futures, and the bottom blue line is the rolling sum of deltas traded on the day. As you can see there was a big drop in that metric at 10:26ET, when this trade went up.
Each quarter JPM Hedge funds add hedge protection in the form of an options collar trade. The sell a 3-5% out of the money call, and use those proceeds to buy a 3-5% out of the money put spread. We cover that trade in detail, here.