First Union Corp. warned analysts Tuesday that it may have to classify a "large" commercial loan as nonperforming in its fourth-quarter results.

The disclosure was also made late Monday in the Charlotte, N.C., company's quarterly filing with the Securities and Exchange Commission. Executives talked about the troubled credit during a presentation with analysts Tuesday, though they declined to identify the customer. "In late October, the financial condition of a single large borrower deteriorated significantly," the SEC filing said.

Subscribe Now

Access to authoritative analysis and perspective and our data-driven report series.

14-Day Free Trial

No credit card required. Complete access to articles, breaking news and industry data.