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It's the flip side of Moody's big bank downgrades earlier this week.
Moody's kept the downgrades going Friday by cutting the ratings for $64 billion in US municipal bonds.
The bonds include debts owed by 1,675 state and local governments, Reuters said. Natural gas bonds issued by utilities in Tennessee, Kentucky and Texas also saw ratings downgrades.
Moody's said it was cutting ratings on state and local government bonds because they rely heavily on the 15 banks whose ratings were cut by Moody's Thursday.
The banks provided "support (that) includes letters of credit, standby bond purchase agreements, and other liquidity facilities," Reuters quoted Moody's as saying.
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Markets didn't flip out to the news, which many investors had been preparing for.
"Some investors selectively sold debt that could be affected ahead of the downgrade, while issuers sought additional ratings for their bonds or got backing from banks that weren't being targeted by Moody's," Dow Jones Newswires said.
"There's not going to be any 'oh my gosh' moment here because this was so well telegraphed," one fund manager told the news agency.
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