Oil-related stocks fell in premarket activity Friday after China, a major oil importer, vowed to impose an additional 34% tariff on all imported US goods, effective April 10.

Shares of Exxon Mobil (XOM) fell 2.9%, Chevron (CVX) slipped 2.8%, Schlumberger (SLB) dropped 4.9%, and Marathon Petroleum (MPC) declined 4.4% after China's response to the Trump administration's announcement of additional duties on goods imported from various countries, including China.