Hello, I would be happy to know what is the minimum percentage of the assets that ETF is required by law to hold in common stocks from the index it tracks (which is segregated from future contracts, derivatives, notes etc)? A good example is VGK (from Vanguard) which didn't tell exactly how much is invested in stocks. I couldn't find it in its website: https://personal.vanguard.com/us/funds/holdings?FundId=0963&FundIntExt=INT It only says that: " It may invest, to a limited extent, in stock futures and options contracts, warrants, convertible securities and swap agreements." what is the "limited extent" by law and where can I find it for Vanguard or any other ETF? How can I know that I'm not exposed too much for non-stocks investments?