Arqit Quantum is trading 6.02% down at $17.32, extending its decline after Thursday’s preliminary results announcement and a lower second-half fiscal 2026 revenue outlook. - It expects second-half fiscal 2026 revenue of $355,000–$380,000, compared with $463,000 a year earlier. - The company stopped recognizing revenue under a material Middle East customer contract affected by regional geopolitical events. Supplied major indices are modestly higher, and the broader market context does not clearly explain the drop.