Tenneco revealed that activist investor Carl Icahn bought 3.48 million Tenneco Class A shares on April 1.
The Icahn Enterprises Holdings investment is worth $10.86 million at the close of trading April 1.
Icahn already was the company’s largest shareholder before that acquisition with a 9.9% stake.
Tenneco has been struggling with the COVID-19 pandemic’s impact. On Friday, it withdrew its first-quarter and full-year earnings guidance.
In January, Dan Ninivaggi, who used to run Icahn Automotive Group and also is a shareholder in Tenneco through his Protean Services firm, demanded that half of Tenneco’s board be replaced. He also suggested that Tenneco should raise cash - to make good on its debt - by selling its aftermarket-parts unit or by selling the entire company. The next day, Tenneco dropped co-CEO Roger Wood.