Network security company Check Point Software (CHKP) - Get Check Point Software Technologies Ltd. Report was down 7.2% as it suffered from Thursday evening's weak outlook by rival RSA Security (RSAS) .

RSA said second-half results would come in sharply lower than expectations.

On July 3, Check Point warned that revenue for the second quarter would be $140 million, slightly lower than the $143 million to $153 million expected by analysts.

Another in the sector,

Internet Security Systems


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, was down 4.1% today. Internet Security warned July 2 it expected a second-quarter loss of 2 cents a share, vs. expectations for a profit of 15 to 16 cents a share.

Also, ADRs of U.K. company

Baltimore Technologies


were down 21.7%. Shares of the company had surged on the London exchange on news of a possible takeover by privately held