** Shares of oil and gas firm Tullow Oil TLW.L down 17.94% at 6.95 p, top losers in London's Small-Cap Index .FTSC, which is down 0.55%
** Tullow Oil expects 2025 group production to be at the lower end of the 40-45 kboepd range
** Co says it continues to face challenges related to the decline in its existing well stock
** Says engaging with bondholders, commodity traders, private sources of funding for refinancing capital structure
** Up to Thursday's close, stock had fallen 60.22%, compared with a 4.89% increase in FTSC
(Reporting by Simone Lobo in Bengaluru)
((Simone.Lobo@thomsonreuters.com, +919920570373))