Billionaire investor Carl Icahn acquired a 14.8% stake in auto service chain Monro, making him the largest shareholder. It’s unclear if he plans to push for changes. Monro’s shares surged over 17% after the disclosure, surpassing BlackRock Fund Advisors. Icahn remains active despite challenges at his investment firm.

Icahn, known for taking large stakes in companies, has added Monro to his list of investments. His move comes after Monro’s shares fell over 40% this year due to declining sales and rising labor costs. Icahn previously owned Icahn Automotive before selling it last year as part of a restructuring.

Read more at CNBC: Auto repair chain Monro soars after Carl Icahn takes 15% stake