Also

* Bristol-Myers Squibb Co.’s top AAA credit rating was cut two levels, to AA, by Standard & Poor’s, which cited setbacks in developing new drugs.

* J.P. Morgan Chase & Co.’s credit rating outlook was changed to “negative” by Moody’s Investors Service amid concerns that the bank’s dealings with Enron Corp. may damage its reputation and spur losses from legal claims.

* Standard & Poor’s cut Dynegy Inc.’s credit ratings for the second time in four days, saying the energy trader suffers from “tenuous” liquidity and a weakened ability to generate cash.