Arqit Quantum (NASDAQ:ARQQ) rose 35.57% on June 23, 2026, as US quantum orders ignited a security rally, with shares closing at $29.04.

Key Highlights

  • Rose 35.57%: Arqit Quantum closed at $29.04 on June 23 after moving $7.62 per share.
  • Catalyst: During the session, US quantum orders ignited a security rally.
  • Company: Arqit Quantum sells quantum-safe encryption software intended to protect data and communications networks.
  • Session: The stock finished at $29.04, while the available company record showed a disclosed catalyst for the move.

Arqit Quantum (NASDAQ:ARQQ) rose 35.57% on June 23, 2026, closing at $29.04 after a $7.62 per-share move. The session’s advance came as US quantum orders ignited a security rally, based on the available company disclosures and trading context.

The quantum sector rallied broadly after the US president signed two executive orders advancing quantum technology initiatives, one focused on developing quantum computing for advanced scientific applications and another mandating federal agencies implement post-quantum encryption protocols before 2031. Arqit, which provides quantum-safe encryption software, was particularly well-positioned for the post-quantum cybersecurity mandate theme.

Arqit Quantum sells quantum-safe encryption software intended to protect data and communications networks.

Short-covering amplified the move given the stock's elevated short interest. No company-specific announcement accompanied the session's surge.

The policy action applied across the quantum technology and cybersecurity sector, rather than to a single listed company. The measures increased attention on federal computing, sensing and post-quantum encryption priorities, areas connected to Arqit Quantum’s business.

No separate company-specific contract or earnings release accompanied the June 23 move. The stock’s $29.04 finish primarily recorded the market response to the broader government initiative.

For the June 23 close, the defining facts were the 35.57% advance, the $29.04 closing price and the catalyst described above. Any further change in the investment record would require a new filing, financial update, regulatory communication or transaction announcement from the company.