The pressure on FICO follows a regulatory shift requiring Fannie Mae and Freddie Mac to use a unified mortgage pricing grid, which eliminates a 20 point disadvantage for VantageScore borrowers and gives lenders a $0.99 alternative to FICO's ~$10 score. Fair Isaac shares fell 27% on Sept. 29, the stock's worst single day since 1989, and is now down 64% for the year and more than 68% below its all-time high.
