Bel 20 drops 3.17% as arGEN-X leads selloff; KBC, Melexis fall

The Brussels Bel 20 index fell up to 3.17%, driven by a sharp decline in arGEN-X, with fourteen components down. Losses were broad-based, including KBC (-1.91%) and Melexis (-2%), while AB InBev (+1.63%) and D'Ieteren (+2.23%) provided partial support. The move reflects sector-specific or company-specific pressure rather than a broad macro shift, though the magnitude suggests notable risk-off sentiment in Belgian equities.