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Internet security software maker RSA Security (RSAS) was down 24.8% in preopen Island trading, hitting its lowest point since April 9, after the company warned that second-half earnings and revenue would fall short of Street estimates.

Also Thursday, RSA posted earnings of 17 cents a share, 1 cent below the consensus estimate and up from the year-ago earnings of 14 cents. Revenue was $80.8 million, vs. $66.7 million in the year-ago period.

This morning, the stock was downgraded to hold from buy by

Credit Suisse First Boston

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.