Portillo's is an iconic midwestern fast casual chain founded more than 60 years ago. It has a differentiated menu anchored by Italian beef sandwiches, hot dogs and milkshakes. The company was acquired by private equity firm Berkshire Partners in 2014 from the founder for approximately $1 billion. Berkshire took it public in October 2021 at $20 per share, and the stock soared to $54.22 per share about a month later. Since then, Berkshire has been selling its position down from 66% to 19% while the stock has ...