It’s unusual when a major corporation boasts about its decision to cut back on doing business with Amazon.

But FedEx’s announcement on Friday that it would not renew its contract to provide express shipping service for Amazon in the United States was a signal that it believes e-commerce is bigger than just one company. FedEx said its “strategic decision” would allow it to focus on “serving the broader e-commerce market.”

“FedEx has already built out the network and capacity to serve thousands of retailers in the e-commerce space, including brands such as Target, Walgreens and Walmart,’’ a FedEx spokeswoman said in a statement.

Walmart has become a particularly large FedEx customer, analysts say, and the move not to renew the contract shows how the shipping company is deepening ties with Amazon’s biggest rival.