Traders didn't have a lot to get excited about after the close Friday, until WorldCom ( WCOM) upset the rather quiet mood with a revenue warning. Following the close of regular trading, WorldCom lowered its revenue guidance for 2002 and cut its capital spending plan. The stock was lately down 13.5% to $5.17, making it the biggest percentage loser on the Instinet platform after the close. As usual on a Friday, little corporate news was being released. Volume was moderate, with around 2.9 million shares changing hands among the top-20 volume movers 75 minutes into the late session. Credit card issuer Metris ( MXT) was ticking up 0.1% to $13.13, and a handful of other non-tech companies were making their way onto the volume leader board. Tyco International ( TYC) was active, but unchanged at $29.89. Sun Micro ( SUNW) was slipping 0.3% to $9.12, and the Nasdaq 100 Unit Trust ( QQQ) was down 0.2% to $34.40. Microsoft ( MSFT) was ticking up 0.1%, while Cisco ( CSCO) was slightly lower, and Intel ( INTC) was unchanged.