ThredUp Inc. Class A Common Stock. Replay the stock market charts of TDUP day by day, back to 2003. Open long and short positions without spending any money. ThredUp Inc., together with its subsidiaries, operates online resale platforms that allows consumers to buy and sell secondhand women's and kids' apparel, shoes, and accessories. ThredUp Inc. was incorporated in 2009 and is headquartered in Oakland, California.