Oilfield services provider Schlumberger ( SLB) was among the NYSE's losers Friday, as the company reported sliding third-quarter revenue in North America.

Schlumberger shares were falling 11% after it reported profits of $1.35 billion, or $1.09 a share, up from $1 billion, or 81 cents a share, in the year-ago period. Revenue rose to $5.93 billion, from $4.95 billion a year earlier. Those figures beat projects by analysts polled by Thomson Financial, which saw earnings of $1.06 a share on revenue of $5.89 billion. Revenue in North America, however, dropped 3%. Shares were falling $12.26 to $99.36.

Other oil and gas-related companies were also sinking on Schlumberger's results. Equipment provider Smith International ( SII) was shedding $6.81, or 9.6%, to $64.22.

Caterpillar ( CAT) was losing 6%, after missing third-quarter expectations and lowering guidance for the full year. The industrial equipment maker posted profits of $927 million, or $1.40 a share, below analysts' forecast of $1.43 a share. Revenue rose 9% to $11.44 billion, exceeding estimates. For the full year, Caterpillar maintained its sales outlook at around $44 billion, but lowered its earnings target to between $5.20 and $5.60 a share. Analysts expect $5.44 a share. The stock was lower $4.66 to $72.

Tribune ( TRB) shares were shedding 5.4%, after a Federal Communications Commission official made comments that could hurt real estate mogul Sam Zell's $8.9 billion bid to take the company private, according to the Los Angeles Times. Zell's bid is contingent on FCC waivers allowing him to own both newspapers and TV stations in the same market, but the FCC is currently debating whether to ease restrictions on that type of arrangement and may not grant new waivers until it settles the matter. Tribune shares were losing $1.50 to $26.42.

On the winning end, Overstock.com ( OSTK) shares jumped 9.3% after the online retailer narrowed its third-quarter loss and beat estimates. The company said it lost $4.7 million, or 20 cents a share, vs. a loss of $24.5 million, or $1.16 a share in the year-ago period. The company reported revenue of $161.9 million for the quarter, vs. $156.9 a year ago. Analysts had expected a loss of 39 cents a share on revenue of $155.1 million. Shares were gaining $2.75 to $32.40.