Thermo Fisher stock hits fresh 52-week high as volume jumps in late trade
New York, Jan 21, 2026, 19:34 EST — After-hours Thermo Fisher Scientific Inc shares climbed 2.8%, closing at $636.30 on Wednesday and hitting a new 52-week high. After hours, the stock barely moved following heavy volume earlier in the day. The S&P 500 advanced 1.16%, while the Dow added 1.21%.