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Fracking has also come under fire from environmentalists. Halliburton is the biggest pressure-pumping provider based on revenue, with nearly 29 percent of the market in 2012, according to a Barclays Capital report this month that cited figures from Spears & Associates, an oilfield-services consulting firm. Schlumberger Ltd. had 21 percent, and Baker Hughes almost 4 percent, according to the report. No other company even reached 5 percent. It was not clear whether federal officials also sought information from Schlumberger. The company declined to comment. Halliburton's stock fell 48 cents, or 1.1 percent, to close at $44.34 Thursday. Baker Hughes' shares dropped 30 cents to $47.46, while Schlumberger stock slipped 28 cents to $82.57.
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