Shares of next-gen encryption-software trailblazer Arqit Quantum (NASDAQ: ARQQ) were up 10.9% as of market close today, according to data provided by S&P Global Market Intelligence. Arqit, which just went public via a SPAC merger at the start of September, is currently double the price it was when it made its publicly traded debut, but is half its peak valuation in mid-September.