ARQQ ▲ +0.2% - Arqit Quantum Inc. $ARQQ RKLB IONQ PL - Satellites Built Today Must Outlive the Encryption Protecting Them Arqit Quantum (ARQQ) rose 0.2% today as the company continued to highlight the strategic importance of quantum-resistant encryption for satellite infrastructure, addressing a core market narrative around the vulnerability of current satellite systems to future cryptographic threats. 17-SEP-2026 09:16 AM ET