Tensions between the largest freight broker in the U.S. and an activist investor are growing. The Wall Street Journal reports that C.H. Robinson Worldwide is standing its ground against Ancora Holdings and its call for steep changes in the company’s structure, including carving out the international freight forwarding operation from the core domestic freight brokerage business.

The divide is the latest example of the challenges that strategies built on cross-selling and so-called one-stop shop shipping services face, at least for investors.

XPO Logistics over the past two years has been unpacking an array of business units pulled together through a series of acquisitions. 

C.H. Robinson says its global forwarding arm is crucial to its success because customers feed business into its domestic operation. The company is looking for a new CEO, and that person will likely have to solve the questions swirling around the business.