In after-hours trading, GDTC and TDTH emerged as top performers, with GDTC climbing 35.3% to $1.15 on a volume of 9.8 million shares, and TDTH rising 24.9% to $0.370 with 3.9 million shares traded. Other notable gainers included CISS, up 14.5% to $1.90, and XRTX, which increased 33.6% to $0.671. Volume spikes were significant, with COHR experiencing a 12,448x increase in volume despite a 7.9% price drop to $202.87. ELPW saw a 229.4x volume surge, jumping 70% to $1.53. Meanwhile, ELAB's volume rose 149.1x, though its price fell 6% to $1.89. These movements highlight significant trading activity in the after-hours market.