I noticed differences in option volume at IBs TWS and barchart. For example IB shows me for NVDA a volume of 122k, at the same time barchart shows a volume of 251k. For ELAN IB shows me a total volume for today of 38k. When checking the window for all calls and puts i get a sum of 1.5 k (max) when adding all calls and puts manually. Could someone explain this to me? Thanks
THis is at 12:40pm ET on Lightspeed Trader. Check with both now. Our volume includes all exchanges and dark pool prints with pre-market volume.