Law Commons^™

Mere Common Ownership And The Antitrust Laws, Thomas A. Lambert

Faculty Publications

"Common ownership," also called "horizontal shareholding," refers to a stock investor's ownership of minority stakes in multiple competing firms. Recent empirical studies have purported to show that institutional investors' common ownership reduces competition among commonly owned competitors. "Mere common ownership" is horizontal shareholding that is not accompanied by any sort of illicit agreement, such as a hub-and-spoke conspiracy, or the holding of a control-conferring stake. This Article considers the legality of mere common ownership under the U.S. antitrust laws. Prominent antitrust scholars and the leading treatise have concluded that mere common ownership that has the incidental effect of lessening market …