Fair Isaac Corporation (FICO) is set to swallow its worst single-day stock performance in history today, cratering as much as 26% after earlier touching a session low of $595.19. The FICO stock crash follows Federal Housing Finance Agency (FHFA) Director Bill Pulte's announcement that Fannie Mae (FNMA) and Freddie Mac (FMCC) would consolidate their dual pricing matrices into a single unified grid that formally places VantageScore on equal footing with FICO Classic for mortgage lending.