The process of industrial decentralization in the US has been the subject of much research. Recently several scholars have become concerned with the role of large corporations in the ongoing regional shift of manufacturing production. Several of these have drawn the analogy to the spread of multi-national corporations abroad. This growing literature suggests that large corporations are a driving force of industrial decentralization with the U.S. Given the absolute importance of large corporations in the American economy, it would be hard to imagine that they have not participated in this movement. However, there is little evidence as to whether the decentralization of these large corporations has been disproportionate in any sense. The purpose of this paper is to determine whether significant disproportionality is in evidence.