Allbirds has filed for a confidential IPO, financial and industry sources told WWD.

The San Francisco, CA-based sustainable footwear brand last September was valued at $1.7 billion.

The report noted that the offering would follow initial public offerings this year from ThredUp, Poshmark, The Honest Co., Dr. Martens, and Mytheresa.

Warby Parker, Authentic Brands Group and Rent the Runway are also reportedly exploring offerings.

Photo courtesy Allbirds