Shares of Rigetti Computing (RGTI) plummeted 7.80% in Thursday's trading session, significantly underperforming the broader market and exceeding earlier reports of a sector-wide decline in quantum computing stocks. The sharp drop came as investors appeared to sour on quantum computing companies, with several firms in the sector experiencing notable losses.

Earlier in the day, reports indicated that quantum computing shares were tumbling across the board. MicroCloud led the decline with a 24% drop, followed by Arqit Quantum falling 10%, while Quantum Corp, IONQ, and D-Wave each shed about 6%. Initial reports suggested Rigetti Computing was down 4%, but the final figures show a much steeper decline for the company.

Adding to the potential selling pressure, Rigetti Computing filed an automatic mixed securities shelf after market close. This filing, which allows the company to issue various types of securities, may have contributed to investor concerns about potential dilution or increased debt, exacerbating the stock's downward movement during the trading session.