Jefferies Randall & Dewey, the US boutique, has won its third multi-billion dollar advisory mandate from Canadian oil group Anadarko Petroleum in six months, working on deals totalling almost $4bn (€3bn).

Anadarko said it had agreed to sell two oil fields to rival Exco Resources for $1.6bn, to reduce its levels of debt following the takeover of Kerr-McGee and Western Gas Resources for $23.3bn in June.