Several of the secondhand retailers made splashy public stock listings this year, but have since seen enthusiasm for their shares fade amid market concerns that people will return to in-person shopping as lockdown orders eased and stores reopen. Poshmark, for instance, gained 142% in its trading debut in January, but its shares have since sunk 76%. ThredUp, which offers clothes to borrow or buy, similarly underperformed initial expectations after it went public in March, jumping 43% on its first day of trading before giving up most of those gains in the first month.