This software company has barely scratched the surface of its enormous addressable market.Bill.com (BILL -1.96%) is an enterprise software company that helps small and mid-sized businesses (SMBs) streamline their bookkeeping and expense management workflows. Its stock came public in December 2019 at $22 per share, and in less than two years, it had soared 1,418% to an all-time high of $334.Capital was cheap back then thanks to historically low interest rates, so Bill invested heavily in growing its customer ...