Six years on, the reverberations from Volkswagen’s Dieselgate scandal continue to be felt as Porsche SE, a holding company that is the automaker’s biggest shareholder, faces a lawsuit in the U.S. over claims related to the emissions scandal.

The suit was filed in April with the Supreme Court of the state of New York, Porsche SE revealed in its half-year report. The suit targets both it and former members of the management and supervisory board of VW, per Reuters. Porsche SE holds 31.4 percent of Volkswagen stock.

The identity of the plaintiffs has not been revealed nor has the amount they are asking, but the holding company did disclose that they claimed to be VW shareholders.

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“The plaintiffs claim to be shareholders of Volkswagen AG and assert with their action alleged claims of Volkswagen AG on behalf of Volkswagen AG,” Porsche SE said.

The Dieselgate scandal broke in 2015 when it was discovered that Volkswagen’s so-called clean diesel engines used a software program to cheat on their emissions tests. That allowed the company’s vehicles to pass the tests and at the same time pollute more than they should have for years.

The scandal has cost the automaker more than €32 billion ($38 billion USD) in fines and legal costs so far. It also spurred the company to invest heavily in electric vehicles to help rehabilitate its image in the public eye.

Volkswagen and Porsche SE are currently subject to €4.1 billion in shareholder claims in relation to the crisis, reports Reuters, making this just the latest in a series of suits all of which could take years to resolve.