Allbirds

Allbirds is a San Francisco footwear and apparel company that built a global brand on wool sneakers and a sustainability-first ethos. Co-founded in 2015 by former pro footballer Tim Brown and biotech engineer Joey Zwillinger, it turned superfine merino wool, eucalyptus tree fiber and sugarcane into low-carbon shoes, became the first fashion brand to print a carbon footprint on its products, and reached a $4 billion valuation at its 2021 IPO. After years of declining sales, store closures and a stock collapse, Allbirds agreed in March 2026 to sell its brand and assets to American Exchange Group for roughly $39 million.