BIG.PA stock down 13.99% after hours at €0.82: technical weakness with small model upside

BIG.PA stock plunged 13.99% after hours on 21 Jan 2026, closing at €0.82 on EURONEXT in Europe. The move followed heavy selling with 81,144 shares traded, five times average volume, and a break below the 50-day average of €0.98. Traders flagged weak technicals and stretched working capital metrics as drivers. We examine the price action, fundamentals, technicals, a Meyka AI grade, and what the model now projects for short-term targets.