Here you will find the historical credit rating changes for ABB Ltd by Moody's and Standard & Poor's.
December 19, 2006 Long-term Senior Unsecured Rating ("Issuer Rating"): Baa1 Short-term Debt rating: Prime-2 Outlook: Stable April 12, 2006 Long-term Senior Implied Ratings: withdrawn due to investment grade upgrade Long-term Senior Unsecured Rating: Baa3 US$ 1 billion multi-currency Revolving Credit Facility Rating: Baa3 Positive outlook May 18, 2004 Long-term Senior Implied Ratings: Ba2 Long-term Senior Unsecured Rating: Ba2 US$ 1 billion multi-currency Revolving Credit Facility Rating: Ba2 Stable outlook October 29, 2003 Positive outlook December 20, 2002 Long-term Senior Implied Ratings: Ba3 (negative outlook) Long-term Senior Unsecured Rating: B1 (negative outlook) October 31, 2002 Long-term Senior Implied Rating: Ba2 (negative watch) October 22, 2002 Long-term Senior Unsecured Rating: Baa3 (negative watch) Short-term Debt Rating: NP March 25, 2002 Long-term Senior Unsecured Rating: Baa2 (negative watch) Short-term Debt Rating: Prime-3 March 15, 2002 Long-term Senior Unsecured Rating: A3 (negative outlook) Short-term Debt Rating: Prime-2 December 19, 2001 Long-term Senior Unsecured Rating: A2 (negative outlook) May 21, 2001 Long-term Senior Unsecured Rating: Aa3 (stable outlook) December 1, 1989 Long-term Senior Unsecured Rating: Aa2 Short-term Debt Rating: Prime-1 Standard & Poor's May 15, 2006 Long-term Corporate Credit Rating: BBB+ Long-term Senior Unsecured debt: BBB US$ 2 billion multi-currency Revolving Credit Facility Rating: BBB+ Short-term Corporate Credit Rating: A-2 Stable Outlook April 3, 2006 Long-term Corporate Credit Rating: BBB- Long-term Senior Unsecured debt: BB+ US$ 2 billion multi-currency Revolving Credit Facility Rating: BBB- Short-term Corporate Credit Rating: A-3 Positive Outlook November 7, 2005 CreditWatch with positive implications December 6, 2004 Stable outlook October 28, 2003 Positive outlook January 13, 2003 Long-term Corporate Credit Rating: BB+ (negative outlook) Long-term Senior Unsecured Debt: BB- (negative outlook) Short-term Corporate Credit Rating: B December 18, 2002 Long-term Senior Unsecured Debt: BB+ (negative watch) November 5, 2002 Long-term Corporate Credit Rating: BBB- (negative watch) Short-term Corporate Credit Rating: A-3 October 22, 2002 Long-term Corporate Credit Rating: BBB+ (negative watch) October 1, 2002 Long-term Corporate Credit Rating: A- (negative outlook) April 23, 2002 Short-term Corporate Credit Rating: A-2 (negative outlook) March 26, 2002 Short-term Corporate Credit Rating: A (negative watch) February 7, 2002 Long-term Corporate Credit Rating: A+ (negative outlook) Short-term Corporate Credit Rating: A-1 December 23, 1998 Long-term Corporate Credit Rating: AA- June 26, 1989 Long-term Corporate Credit Rating: AA