Standard & Poor's Friday ceased pricing more than half of the auction-rate securities previously listed on its securities evaluation service due to lack of information, the company said.

"Information and clarity are the underlying fuels of pricing and in the absence of being able to get that kind of information we feel that it's prudent to stop pricing for those securities that we're not able to get that kind of information readily for," Standard & Poor's spokesman Michael Privitera said.

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