The billionaire investor Bill Ackman raised his ownership in the sportswear company Nike by 15% and reduced his stake in the fast-casual food chain Chipotle Mexican Grill by 14% in the fourth quarter, as per a regulatory filing submitted on Friday.

Through his firm Pershing Square Capital Management, Ackman now holds 18.8 million shares in Nike and 24.7 million shares in Chipotle, a company that his firm has been invested in since 2016.

While Ackman was previously known as a vocal activist on Wall Street, advocating for changes at companies like Canadian Pacific Kansas City and Air Products and Chemicals, he has transitioned to a more low-key investment approach in recent years. Nonetheless, his investment choices continue to attract significant attention and interest.

The firm has been steadily cutting its investment in Chipotle, one of its big winners in recent years. On June 30, Pershing Square owned 28.8 million Chipotle shares.

The filing, known as a 13F filing, shows what fund managers owned at the end of the previous quarter.

The firm also cut its stake in Hilton Worldwide Holdings by 26% to 5.4 million shares.

Its biggest holding was investment firm Brookfield with roughly 35 million shares.