Deutsche Bank analyst Kevin McVeigh believes shares of Equifax (EFX) could close down 10% today after the company disclosed a security breach potentially impacting up to 143M consumers. The stock in premarket trading is down 13%, or $18.72, to $124.00.

The analyst says that while difficult to quantify, his best effort suggests the financial impact could be in the range of $300M-$400M, which reflects the costs for credit monitoring, regulatory fines and penalties. Keith recommends waiting for Equifax shares to settle before accumulating fresh positions.

The analyst, however, recommends buying TransUnion (TRU) on any selloff in sympathy to Equifax. He thinks TransUnion could trade down 3%-5% today before rebounding. Keith has a Buy rating on Equifax with a $160 price target.