structured investment vehicles

Structured investment vehicles at issue

The debt securities under scrutiny in Orange County's investment pool were issued by so-called structured investment vehicles, or SIVs -- typically bank-managed funds that borrow using short-term IOUs to buy longer-term assets, such as bonds backed by mortgages or credit card debt.

SIV ratings may be cut at HSBC, Citigroup

Moody's Investors Service sent warnings Wednesday to Citigroup Inc. in New York and HSBC Holdings in London that it might downgrade their structured investment vehicles as the rating company reviews $33 billion worth of the debt.

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