BUZZ-Oil and gas companies: Oil falls below $55
** U.S.-listed shares of oil and gas companies down 6-14 pct
** Oil falls below $55/bbl ahead of U.S. government data expected to show domestic crude stockpiles at all-time highs
** Brent crude down 3.5 pct at $54.48/bbl at 10:25 ET; U.S. crude down 2.6 pct at $48.70/bbl
** Shares of Jones Energy Inc down 10.9 pct at $10.09, Seventy Seven Energy Inc down 8.9 pct at $4.80, Stone Energy Corp down 7.6 pct at $15.47, Penn West Petroleum Ltd down 8 pct at $2.37
** PostRock Energy Corp down 14.4 pct at $5.35, Rexx Energy Corp down 8.5 pct at $4.21, BreitBurn Energy Partners LP down 7.7 pct at $7.13, Linn Energy LLC <LINE.O down 6.4 pct at $12.33
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