During after-hours trading on Tuesday (July 21), the data center sector showed strong performance with mainstream stocks rising collectively. As of press time, NBIS.US traded at $218.60 in after-hours, up $1.68 or 0.77% from its regular market close; compared to the previous trading day's close, the stock's after-hours gain approaches 8% (having already surged 18.78% during regular hours). CRWV.US climbed $2.17 to $81.75 in after-hours trading, representing a 2.73% gain.

Among other names, IREN.US edged down 0.20% to $41.37 in after-hours, though it had surged 2.71% during regular trading; HUT.US rose 0.48% to $109.50 in after-hours, following a 7.98% jump in regular hours. Sector heavyweight ORCL.US extended gains in after-hours trading to $127.60, up 0.43%, after already climbing 4.67% during regular session.

Among derivative plays, NEBX.US gained 1.77% to $32.15 in after-hours, following a massive 37.83% surge during regular hours; ORCX.US advanced 0.76% to $17.19 in after-hours, after rising 9.15% in regular trading. Overall, capital continued chasing data center and computing-related concepts in after-hours session, with sector sentiment remaining elevated.