Jenga

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June 18 (Bloomberg) -- Bill Ackman was right: the world's largest bond insurers aren't worthy of a AAA credit rating and may be headed for the bottom of the scale.

Ackman, the 42-year-old hedge fund manager who says he stands to make hundreds of millions of dollars betting against MBIA Inc. and Ambac Financial Group Inc. if they go bankrupt, will tell investors at a conference in New York today that losses posted by bond insurers may threaten to breach the capital limits allowed by regulators, making them insolvent.

That once-unthinkable scenario would trigger clauses in $400 billion of derivative contracts written to insure collateralized debt obligations and other securities, allowing policyholders to demand immediate payment for market losses, which have reached $20 billion, according to company filings. Downgrades of the insurers would cause a drop in rankings for the $2 trillion of debt that the companies guarantee, wiping out the value of the CDO insurance held by Wall Street firms, analysts at Oppenheimer & Co. said.