QSI ▲ +1.3% - Quantum-Si incorporated $QSI - Quantum-Si Expands Proteus™ Roadshow with Additional U.S. and European Cities Quantum-Si shares rose 1.3% following the company's announcement that it is expanding its Proteus™ roadshow to include additional cities across the U.S. and Europe, signaling broader efforts to promote adoption of its platform. 09-SEP-2026 08:01 AM ET