Arqit Quantum is trading 5.56% up now at $21.25, alongside a stronger technology-led market.
- The Nasdaq Composite is up 1.35% and the S&P 500 is up 0.77%; falling oil prices and Treasury yields are supporting risk appetite.
- No fresh company-specific catalyst was identified on September 21, 2026; recent coverage references the September 1 satellite-security demonstration.
- The move appears primarily global, with quantum and technology-linked shares benefiting from improved sentiment.