** U.S.-listed shares of Obsidian Energy OBE.N jump 9.7%
to $1.13
** Co says starting a formal process to explore options,
which may include sale, merger or other business combination
** Says could also involve disposition of all or a portion
of co's assets, recapitalization and refinancing urn:newsml:reuters.com:*:nPn9vM2N2a
** Shares among top percentage gainers across U.S. exchanges
** For the year, New York-listed shares have fallen 60%,
while Toronto-listed OBE.TO have dropped ~61%
(Reporting by Shreyashi Sanyal in Bengaluru)