Clifford Chance’s (CC’s) Washington DC arm has successfully signed off a high profile antitrust instruction for Shell Oil, securing the way for the oil giant’s Houston-based subsidiary’s $1.8bn (£1.16bn) takeover of Pennzoil-Quaker State Company.

The deal, announced in March, was delayed while the US Federal Trade Commission (FTC) investigated five product areas for anti-trust issues.
CC’s global co-head of antitrust and former director of litigation at the FTC’s bureau of competition, Steve Newborn, led the deal alongside partner Laura Wilkinson.