My account provider changed its history fee from -0.1 to 0.29 per 100 shares in July, which caused me lost more than $40,000, it make no sense right?
Can you expand? What is a "history fee." when you say "account provider", do you mean your broker? BATS Fee schedule. Looks like it changes very often. https://www.bats.com/us/equities/notices/fee_schedule/