Briefly

Three former employees of Knight Trading Group Inc., a top market maker in Nasdaq stocks, have received Wells notices from federal regulators informing them that they could be subject to enforcement or disciplinary actions, the company said Monday. The notice from the SEC’s enforcement division said its investigations relate to trading, supervision and record-keeping from 1999 through 2001, focusing in particular on whether the company traded in front of client orders. Wells notices offer those receiving them an opportunity to explain why regulators shouldn’t pursue enforcement actions.