Here you will find the historical credit rating changes for ABB Ltd by Moody's and Standard & Poor's.
Moody
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Long-term Senior Implied Ratings: withdrawn due to investment grade upgrade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
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