BUZZ-Transocean Ltd: Profit beats estimates for sixth quarter
** Rig contractor Transocean Ltd's U.S.-listed shares up 2.15 pct at $30.35 premarket
** Adjusted profit beats market estimates for the sixth straight quarter as costs fall roughly 4 pct
** A $2.76 billion impairment charge, announced last week, pushes company to Q3 loss
** Drops plans for private placement of shares of Caledonia Offshore Drilling; no reason given
** Up to Friday's close, stock had fallen nearly 40 pct this year, much steeper than the 3 pct fall in the Dow Jones oil equipment and services index
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