Arqit Quantum Inc. (ARQQ:NASDAQ) closed at $14.02 on October 16, 2026, down 11.82% on the day. The stock trades 71.6% below its 52-week high of $49.33 and 21.7% above its 52-week low of $11.52. Over the past year, it lost 66.2%. Arqit Quantum Inc. is part of the Technology sector.
| 5D | 1M | 3M | 6M | 1Y |
|---|---|---|---|---|
| -15.82% | -28.18% | -18.54% | -13.19% | -66.21% |
In 252 trading sessions since October 16, 2025, ARQQ closed higher on 111 days (44%). Its best day was June 23, 2026 (+35.57%) and its worst was October 16, 2025 (-26.01%). The stock moved 10% or more in a single session 32 times. It opened at least 5% above the previous day's high 3 times.
Arqit Quantum Inc is symmetric encryption reborn for the cloud. It supplies a unique quantum encryption Platform-as-a-Service that makes the communications links of any networked device secure against current and future forms of attack even from a quantum computer. Its product, QuantumCloud, enables any device to download a lightweight software agent, which can create keys in partnership with any other device. The firm operates in one segment being the provision of cybersecurity services via satellite and terrestrial platforms.
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Based on end-of-day data. For information only, not investment advice.