Prejudgment interest

Section 4 of the Clayton Act (15 U.S.C. 15) is amended by striking subsection (a) and inserting the following: (a) Except as provided in subsection (b), any person who shall be injured in his business or property by reason of anything forbidden in the antitrust laws may sue therefor in any district court of the United States in the district in which the defendant resides or is found or has an agent, without respect to the amount in controversy, and shall recover threefold the damages by him sustained, the cost of suit, including a reasonable attorney’s fee, and simple interest on threefold the damages by him sustained for the period beginning on the date of service of such person’s pleading setting forth a claim under the antitrust laws and ending on the date of judgment..