With four bond insurance companies facing the potential loss of their triple-A financial strength credit ratings, the effects are bound to ripple through not only banks but bond issuers.
In the $2.6 trillion municipal bond market alone,
the debt downgrades threaten some 563,000 individual ratings on municipal issues backed by bond insurance, according to Moody's Investor Service. About half of municipal bonds are backed by insurance, Moody's says, though some of the underlying bonds carry their own ratings and often those are at least single- or double-A.
But downgrades to the bond insurers, including the two biggest,
Ambac Financial Group (nyse: ABK - news - people ) and
MBIA (nyse: MBE - news - people ), could trigger downgrades of municipal bonds, especially those without underlying ratings. Late Friday the dominoes were set in motion after Fitch downgraded Ambac's financial strength rating to double-A from triple-A, and it downgraded 420 classes of asset-backed securities transactions backed by insurance provided by an Ambac subsidiary.
The uncertain fate of the bond insurers means municipal issuers may have to look elsewhere to guarantee their debt offerings, a requirement of some bond mutual funds. That doesn't mean municipal issuance will drop off. "No one is predicting a significant decline," says Gail Sussman, managing director of public finance at Moody's. "But the landscape will continue to be in flux for a while."
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There is plenty of finger-pointing. Bond insurers began life in the 1970s backing plain old government and corporate bonds. In the last few years, they jumped into the world of structured finance and the complex credit derivatives are getting them into trouble now.
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The significant leverage with which the bond insurers operate has been a big source of controversy, though the ratings agencies haven't acted until recently. "The perfect storm took time to brew, but it hit hard and fast when it came--much harder and faster than we expected," says Banc of America Securities analyst Tamara Kravec, who cut the group to "neutral" from "overweight" on Friday.
Rob Haines from CreditSights had a dimmer view of the situation in mid-December, when the ratings agencies first put the so-called monolines on review.
"It has been clear for some time now that the industry as a whole simply does not hold sufficient capital to absorb a fat tail structured default event," Haines wrote then.
"Although the markets had come to this consensus several months ago, the agencies chose to wait until the week before Christmas to finally capitulate."Forbes