Rainbow Technologies

(RNBO)

was down 30.1% in early trading after hitting a 52-week low of $7.88. The Internet security company warned late Friday that it expects to post fourth-quarter earnings of 10 to 14 cents per share, short of the Street's estimate of 18 cents. The company, which is due to report earnings Feb. 28, blamed a sudden slowdown in the last month of its quarter.