One year ago this month, the Pennsylvania Supreme Court in Mortimer v. McCool, 255 A.3d 261 (Pa. 2021) adopted the "enterprise theory" of piercing the corporate veil, thereby placing Pennsylvania among the minority of states that have adopted the theory and expanding the scope of veil piercing under Pennsylvania law to "sister" or "affiliated" business entities. Although the court adopted the enterprise theory, it declined to apply the theory to the facts presented in Mortimer and did not adopt a standard for determining when the doctrine should be applied.