CFTC only publishes total OI on fridays, related to last Tuesday.
But what happened since last Tuesday?
CME Vol & Open Interest data is recorded&exported daily by quandl.com to tradingview
via the che CHRIS/CME datasets
Eg. Nat Gas next outstanding cntract n. 20, field n....
Daily e-o-d Open Interest as published by CME.
As CFTC COT Open Interest relates to last Tuesday, here you can have an idea how things evolved day-by-day since then.
As CME total OI is not accessibl as data, here I sum OI of the next 9 outstanding contracts, which gives a fair idea of the trend in OI