The Terma Group said the agreement covers the sole-source manufacture and assembly of horizontal tail leading edges for all F-35 variants.
The contract is until 2019, includes follow-on options and is worth $95 million.
"The agreement signing solidifies Terma's position on the F-35 program and shows how collaboration can benefit Terma, Lockheed Martin and the F-35 program as a whole," said Jens Maaloe, Terma's president and chief executive officer.
"The companies will explore technologies, set a path forward to achieve manufacturing efficiencies to meet rigorous quality requirements and work toward establishing Terma as a premier supplier of composite parts."
Terma, which has collaborated with Lockheed Martin Aeronautics since 1976 on the original F-16 program, has been part of the F-35 program since 2000. It recently entered an agreement with Northrop Grumman for the manufacture of component parts for the F-35 Lightning II program.
"By entering these agreements, we have established the necessary solid and reliable base for our future investment in technology, production facilities, and human resources," said Maaloe.