After-hours trading runs 4:00 PM – 8:00 PM ET.
SI last traded at $18.52 after hours, down $0.01 (0.08%) from its regular-session close of $18.53.
Shoulder Innovations (SI) is trading at $18.52 after hours, down $0.01 (0.08%) from its regular-session close of $18.53.
SI is down 0.08% in after-hours trading. Moves in this session almost always follow something released after the 4:00 PM ET close — an earnings report, guidance, a filing, or news — and trade on far thinner volume than the regular session, so the size of the move can overstate what the market will settle on at the next open.
After-hours trading in SI on the NYSE runs from 4:00 PM to 8:00 PM ET on trading days, immediately after the regular session closes. Not every broker offers the full window, and liquidity thins sharply after about 6:30 PM ET.