After-hours trading runs 4:00 PM – 8:00 PM ET.
YMAT last traded at $2.16 after hours, up $0.09 (4.35%) from its regular-session close of $2.07.
J-Star (YMAT) is trading at $2.16 after hours, up $0.09 (4.35%) from its regular-session close of $2.07.
YMAT is up 4.35% 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 YMAT on the NASDAQ 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.