Here is the 2009 to current margin requirements found on CME website (thanks Jonny!) for GC 100 oz contracts.

CMX has all that nice data in PDF… what a B**TCH to extract! No wonder it’s hard to find this data or charts of it…

Edit: latest value is 9150 usd.. so we are above +10 year highs in margin req. And creating bearish divergence.. (ie new highs in margin req. vs lower highs in gold price)