Affymetrix, Crocs, Netflix, Western Digital: U.S. Equity Movers

By Jeff Kearns

July 25 (Bloomberg) -- The following companies are having unusual price changes in U.S. trading. Stock symbols are in parentheses, and share prices are as of 9:40 a.m. in New York.

Affymetrix Inc. (AFFX US) plunged 23 percent, the most since April 15, to $8. The maker of tools to analyze genes said revenue will be lower this year than previously forecast because of weak pharmaceutical sales.

Crocs Inc. (CROX US) had the biggest drop since its February 2006 initial public offering, losing 47 percent to $4.79. The company forecast earnings lower than its previous prediction, raising concerns that it may not be able to sell its colored foam clogs profitably.

Interactive Brokers Group Inc. (IBKR US) fell the most since March 17, sliding 14 percent to $27.83. The firm that handles 14 percent of equity options worldwide said second-quarter profit rose less than analysts expected because of smaller gains from market making.

Juniper Networks Inc. (JNPR US) rose the most in a year, adding 9.3 percent to $24.66. The second-largest maker of networking equipment increased its annual profit and revenue forecasts, bolstered by rising orders from phone companies.

Netflix Inc. (NFLX US) advanced the most since June 19, gaining 4.5 percent to $27.94. The largest U.S. mail-order movie service posted its sixth straight quarter of profit growth, beating estimates by 11 percent, as the number of customers increased and the cost of adding them fell.

Reliance Steel & Aluminum Co. (RS US) gained 8.5 percent, the most since April 2007, to $62.07. The U.S. distributor of more than 100,000 metals products canceled a sale of 6.75 million shares because of ``market conditions.''

Tiffany & Co. (TIF US) lost 2.2 percent to $37.84, the lowest since July 15. The world's second-largest luxury-jewelry retailer was cut to ``sell'' from ``neutral'' at Bank of America Corp. Airlines' reductions in flights to New York and other tourist destinations are likely to hurt sales at Tiffany's, analyst Dana Cohen wrote in a report.

Western Digital Corp. (WDC US) fell 8 percent, the most in three months, to $30.93. The world's second-largest maker of hard-disk drives forecast profit that missed analysts' estimates after an industry glut put pressure on prices.

To contact the reporter on this story: Jeff Kearns in New York at jkearns3@bloomberg.net.