Bond-insurer woes may trigger more write-downs
Doubts on AAA ratings for Ambac, MBIA spark turmoil in muni bond market
By
Alistair Barr, MarketWatch
Last update: 6:08 p.m. EST Jan. 18, 2008
SAN FRANCISCO (MarketWatch) -- Just when you thought it was over, trouble in the $2.3 trillion bond-insurance business could trigger another wave of big write-downs from banks and brokerage firms, experts said Friday.
Leading bond insurers Ambac Financial and MBIA look increasingly likely to lose their AAA ratings. While almost unthinkable just six months ago, such concerns are also causing turmoil in the $2.5 trillion municipal-bond market. Bond insurers agree to pay principal and interest when due in a timely manner in the event of a default -- a $2.3 trillion business that offers a credit-rating boost to municipalities and other issuers that don't have AAA ratings. Without those top ratings, their business models may be imperiled.
A more worrying consideration is that when a bond insurer is downgraded, all the securities it has guaranteed are, in theory, downgraded as well.
If Ambac and MBIA lose their top ratings, billions of dollars of muni bonds will be downgraded, and the guarantees that have been sold on mortgage-related securities such as collateralized debt obligations, or CDOs, will lose value.
Bond insurers guarantee roughly $1.4 trillion worth of muni bonds and more than $600 billion of structured finance securities, such as mortgage-backed securities and CDOs, according to Standard & Poor's. Ambac alone has guaranteed about $67 billion of CDOs.
"The destruction of the bond insurers would likely bring write-downs at major banks and financial institutions that would put current write-downs to shame," Tamara Kravec, an analyst at Banc of America Securities, wrote in a note Friday.
Kravec cut her rating on Ambac and MBIA on Friday because she thinks that ratings downgrades are "highly probable" now.
Indeed, Fitch Ratings cut Ambac's AAA rating to AA on Friday, becoming the first major agency to take that step. Fitch downgraded 137,390 muni bond issues and 114 other securities guaranteed by Ambac soon after.
Merrill Lynch & Co. took a $3.1 billion write-down on Thursday related to the firm's CDO hedges. Merrill had bought CDO guarantees from bond insurers including ACA Capital, a smaller player that's now struggling to survive. Most of the write-downs were related to ACA.
CIBC and French banking giant Credit Agricole unveiled similar write-downs in December, related to guarantees they bought from ACA.
'Whopping'
But ACA is much smaller than Ambac and MBIA. If the two larger bond insurers are downgraded, banks and brokers that have bought guarantees from them may have to write-down their exposures further.
Merrill has net CDO exposure of $4.8 billion. But that includes a lot of hedging, mainly through guarantees bought from bond insurers. Excluding those hedges, the brokerage firm still has a "whopping" $30.4 billion of CDOs on its balance sheet, Brad Hintz, an analyst at Bernstein Research, noted on Friday.
"We remain very uncomfortable with Merrill's CDO balance sheet exposure," the analyst wrote in a note to investors. "If the counterparties are downgraded, and they cannot post additional collateral, we would expect that Merrill Lynch would have to take a valuation reserve against that specific exposure."
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