BUZZ-Oil companies: Shares fall as Brent crude plunges to 5-year low
** Oil and gas companies' shares fall 6-22 pct
** Brent crude hits a five-year low of below $68, extending losses after oil producer group OPEC last Thursday decided not to cut output despite fears of a supply glut
** U.S. crude hits intraday low of $63.72 per barrel, lowest since July 2009
** Both U.S. crude and Brent have fallen for five straight months, longest losing streak since 2008 financial crisis
** Energy XXI Ltd down 21.7 pct at $3.13; Breitburn Energy Partners LP down 17.6 pct at $10.89; SandRidge Energy Inc down 13.6 pct at $2.43; Tesco corp down 12 pct at $12.40; Vanguard Natural Resources down 11.8 pct at $20.45; U.S.-listed shares of Petrobras SA down 6.2 pct at $9.12
** Ladenburgh cuts Energy XXI to "neutral" from "buy", and Guggenheim cuts Tesco to "neutral" from "buy", according to theflyonthewall.com
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