STLN.SW Swiss Steel Holding AG (SIX) +11.11% pre-market Jan 2026: volume spike

The STLN.SW stock surged +11.11% in pre-market trade on 29 Jan 2026, led by a volume spike of 23,878.00 shares versus an average of 11,142.00. We see a clear high-volume mover pattern on the SIX in Switzerland that demands a short-term trading checklist. The move lifts the price to CHF 1.30, above the open at CHF 1.15, but remains far below the 12-month high of CHF 12.86. This note explains drivers, key ratios, and the trading implications for investors and traders.