Mostly True
A Korean-language shorthand for the materials, parts and equipment sector — 'sokseul' (소부장), short for materials, parts and equipment — rallied sharply, posting a gain of roughly 12 percent, expressed precisely as 11.69 percent, amid a broader semiconductor rally.
The gain of about 12 percent came in the context of a rebound immediately following a steep market fall, a backdrop that warrants separate attention when interpreting the magnitude of the move.
The rally in semiconductor-related names lifted the 'sokseul' segment, which tracks Korea's sobjang (소재·부품·장비) — materials, parts and equipment — industry. The 11.69 percent figure represents the precise expression of the roughly 12 percent advance cited in the claim.
Because the surge occurred directly after a sharp downturn, the percentage gain reflects recovery momentum rather than a rally from a stable base. The claim that the sector jumped about 12 percent during a semiconductor rally is accurate on its face, with the caveat that the timing — a bounce off a recent low — shapes how the figure should be read.
Overall, the claim that 'sokseul' surged about 12 percent in a semiconductor rally is Mostly True.