HFT are making huge profit margins - their entire industry profit is estimated at around $1bn, or a percentage of what a single large financial institution will

HFT are making huge profit margins - their entire industry profit is estimated at around $1bn, or a percentage of what a single large financial institution will make in a year. It's all relative - they can only make so much profit before they move the market too much themselves, they are limited by their size. Your pension fund is not trading in a way which is significantly adversely affected by HFTs, the CEO of Vanguard is even on the record as saying that HFTs make his traders more efficient. Fund managers employ their own dealers to ensure best execution, if HFTs were causing significant losses you can be sure they would be raising hell - and that regulators and governments would listen.