Light Guidance Hits Internet Security Systems

Updated from 4:24 PM EST

Fourth-quarter profit grew at Internet Security Systems(ISSX Quote), beating analysts' estimates, but the company said first-quarter earnings will come in below current projections.

Following the release, shares of ISS fell 92 cents, or 4.3%, to $20.40 on Instinet's after-hours trading exchange.

The security software maker said after the closing bell Tuesday that net income for the quarter ended Dec. 31 rose to $12.6 million, or 27 cents a share, from $9.2 million, or 19 cents a share, a year earlier. ...