Arqit Quantum Inc. Ordinary SharesARQQ
Closing prices as of Sep 15, 2026Updated once daily after the US close — not a live quote.

$18.10

-25.76% past month

Notable price movement

  • Sep 15, 2026

    $18.27+12.15%

    Shares rose 12.15% on the day, a move not shared by the broad market, which slipped 0.46% . Trading volume was elevated at 2.4x the trailing average, with the session ranging between 16.40 and 19.00 .

  • Sep 14, 2026

    $16.29-18.75%

    Shares fell 18.75%, a decline not mirrored by the broad market, which was down only 0.45% . The session saw volume of 5.8x the trailing average, with prices ranging from 16.07 to 19.22 .

  • Sep 11, 2026

    $20.05-2.58%

    The stock fell 2.58% on the day while the S&P 500 ETF rose 0.85%, indicating the decline was not shared by the broad market . Trading volume was well below its trailing average, at 0.5x the 20-session norm, with shares ranging between 20.00 and 20.95 .

  • Sep 10, 2026

    $20.58-4.90%

    Shares fell 4.90% on a day when the broad market, as measured by the S&P 500 ETF, slipped only 0.60%, so the decline was not shared by the wider market .

  • Sep 9, 2026

    $21.64-4.21%

    Shares fell 4.21%, a decline not shared by the broad market, which moved just -0.46% the same session .

  • Sep 8, 2026

    $22.59+5.71%

    Shares rose 5.71% on a day the broad market slipped 0.55%, so the move was not shared by the wider market .

  • Sep 4, 2026

    $21.37+3.64%

    Shares rose 3.64% on a day when the S&P 500 ETF, used here as a broad-market benchmark, declined 0.39%, indicating the move was not shared by the broader market . The session traded on below-average volume at 0.6x the trailing 20-day average, with prices ranging between 20.23 and 21.40 .

Closing prices for ARQQ. Summaries describe past sessions only and are not advice, a forecast or a recommendation.

Prices and financial data are historical and provided for research only. Not investment advice.