REUTERS/ Brendan McDermidThe smallest companies in the US stock market have gotten the biggest boost from President Donald Trump's proposed corporate tax cut, and investors see no end in sight for the rally. Their confidence is manifesting itself in a lack of hedging. Investors are paying the least since the start of the eight-year bull market to protect against losses in the Russell 2000 index of small-cap stocks. With the gauge just two days removed from a record high, this apparent lack of concern is a highly bullish signal.