Private equity firm KKR has agreed to pay $250 million to resolve a U.S. antitrust investigation concerning alleged repeated violations of federal pre-merger filing requirements. The Department of Justice (DOJ) announced the settlement Wednesday, describing the penalty as the largest civil fine ever imposed under the Hart-Scott-Rodino (HSR) Antitrust Improvements Act. The law mandates that companies notify regulators of certain mergers and acquisitions before completion to ensure antitrust scrutiny.

The DOJ alleged that KKR bypassed required filings in at least 16 transactions, enabling the firm to avoid review that might have impeded or altered its deals. The department did not provide specific details about the transactions involved but emphasized the importance of adherence to HSR filing requirements to maintain fair competition.

KKR acknowledged the settlement but disputed the government’s characterization of its conduct. In a statement, the firm said it “acted in good faith at all times under our prior filing process,” which it said was in line with standard industry practice. KKR also noted that the $250 million penalty would not affect its finances or those of its funds and investors, as the amount would be covered by external legal counsel.

The settlement illustrates increasing regulatory scrutiny on pre-merger compliance within private equity, where the complexity and volume of transactions can present compliance challenges. While neither party admitted wrongdoing as part of the agreement, the DOJ’s record penalty signals its commitment to enforcing antitrust laws rigorously.

The resolution closes a lengthy investigation by the DOJ into KKR’s compliance but also serves as a warning to other firms about the consequences of failing to meet federal notification requirements.