Barclays Capital has moved to the top of the US oil and gas advisory league tables following a spate of recent mandate wins in the sector, including this week's $7.2bn Kohlberg Kravis Roberts-led buyout of a US exploration and production company.

A KKR-led consortium yesterday agreed to buy all of Samson Investment's assets except its onshore Gulf Coast and offshore deep water Gulf of Mexico assets, which will continue to be owned by the founding Schusterman family.