Quantum-Si incorporated fell 16.6% on Friday, October 30, 2026, on 9,884,300 shares. The headline around the move:
Quantum-Si incorporated (QSI:NASDAQ) closed at $1.30 on November 3, 2026, up 3.17% on the day. The stock trades 33.3% below its 52-week high of $1.95 and 88.4% above its 52-week low of $0.690. Over the past year, it lost 31.5%. Quantum-Si incorporated is part of the Health Care sector.
In 252 trading sessions since October 31, 2025, QSI closed higher on 106 days (42%). Its best day was October 1, 2026 (+33.64%) and its worst was June 5, 2026 (-17.97%). The stock moved 10% or more in a single session 19 times. It opened at least 5% above the previous day's high 3 times.
Quantum-Si Inc is focused on revolutionizing the growing field of proteomics. The company's suite of technologies is powered by a first-of-its-kind semiconductor chip designed to enable single-molecule next-generation protein sequencing and genomics, and digitize proteomic research in order to advance drug discovery and diagnostics beyond DNA sequencing.
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Based on end-of-day data. For information only, not investment advice.