Arqit Quantum Inc. - Ordinary Shares (ARQQ)
ARQQ moved a median of +0.14% 30 minutes after news, and -0.14% by the close. How ARQQ actually reacts to news — the realized, point-in-time move the market made, measured across 416 labeled events over the last three years with zero look-ahead.
ARQQ’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 50% | 411 |
| 30-min | +0.14% | 54% | 416 |
| 60-min | -0.61% | 42% | 416 |
| to close | -0.14% | 47% | 415 |
| Middle 50% of ARQQ reactions | -1.84% to +2.03% |
|---|---|
| Median reaction (30-min) | +0.14% |
| Measured reactions | 416 |
Half of all Arqit Quantum Inc. - Ordinary Shares news events land between -1.84% and +2.03% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
Email me when ARQQ moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to ARQQ's baseline. Nothing else.
Recent ARQQ events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Arqit Quantum Inc. Announces Select Preliminary Financial Results for the Second Half and Full Fiscal Year 2026 | Press release | GlobeNewswire | +0.41% | -16.80% | |
| Form 6-K Arqit Quantum Inc. For: Oct 08 | SEC filing · Form 6-K | SEC EDGAR | -5.00% | -10.35% | |
| Today's Stolen Data Could Be Tomorrow's Decrypted Data | Press release | Canada Newswire | +0.00% | +6.22% | |
| Babcock and Arqit demonstrate secure communications network designed to counter future quantum-enabled threats | Press release | GlobeNewswire | +1.62% | -2.00% | |
| Satellites Built Today Must Outlive the Encryption Protecting Them | Press release | PR Newswire | +0.13% | -0.36% | |
| The Quantum Deadline Moved Up. Most Firms Cannot Find Their Own Keys. | Press release | GlobeNewswire | -0.28% | -3.29% | |
| Form 6-K Arqit Quantum Inc. For: Sep 09 | SEC filing · Form 6-K | SEC EDGAR | +0.00% | -2.57% | |
| Arqit, Es’hailSat and AIEE Demonstrate Quantum-Safe Satellite Security | Press release | GlobeNewswire | +0.52% | -1.82% | |
| Form 6-K Arqit Quantum Inc. For: Aug 19 | SEC filing · Form 6-K | SEC EDGAR | +0.24% | -0.99% | |
| Global Post-Quantum Cryptography Market Size Projected to Reach $2.84 Billion By 2030 | Press release | Canada Newswire | +0.79% | +0.14% | |
| You Cannot Protect What You Cannot See: A Cybersecurity Company Just Built a Map for the Encryption Hiding Inside Your Business | Press release | Canada Newswire | +0.53% | +4.22% | |
| nLighten and Arqit prove you can use the public cloud without giving up sovereignty | Press release | GlobeNewswire | -0.80% | +2.74% | |
| A Vancouver Cybersecurity Company Is Betting the Next Big Security Upgrade Starts at the Login Screen, and It Just Pushed Into Southeast Asia | Press release | PR Newswire | +0.71% | +0.00% | |
| Form 6-K Arqit Quantum Inc. For: Jun 17 | SEC filing · Form 6-K | SEC EDGAR | +0.30% | +13.63% | |
| The Quiet Race to Rewire the World's Encryption Before Quantum Computers Break It | Press release | Canada Newswire | +0.30% | +13.63% | |
| As Washington Pours Billions Into Quantum Computing, One Company Says the Real Race Is Defending the Data | Press release | Canada Newswire | -0.10% | -1.69% | |
| The Cryptographic Migration Clock Just Got Real: A Small-Cap Just Released The Tooling Stack For Enterprise Post-Quantum Cutover | Press release | Canada Newswire | +5.59% | +5.69% | |
| AI-Enabled Cyberespionage Is a National Security Threat. Integrated Cyber Solutions Has an Answer | Press release | Canada Newswire | +0.73% | +0.52% | |
| Arqit Quantum Inc. Announces Financial Results for First Half of Fiscal Year 2026 | Press release | GlobeNewswire | +12.29% | +17.50% | |
| Form 6-K Arqit Quantum Inc. For: Mar 31 | SEC filing · Form 6-K | SEC EDGAR | +12.29% | +17.50% | |
| Arqit Quantum Inc. Sets First Half 2026 Earnings Conference Call for Thursday, May 21, 2026 at 11:00 a.m. ET | Press release | GlobeNewswire | +0.56% | -1.12% | |
| Form 6-K Arqit Quantum Inc. For: May 01 | SEC filing · Form 6-K | SEC EDGAR | -0.86% | +0.35% | |
| Tomorrow Street, a joint venture between Vodafone and Luxembourg’s technology incubator, chooses Arqit to add Quantum Security Solutions to its portfolio | Press release | GlobeNewswire | +0.55% | -3.84% | |
| Form 6-K Arqit Quantum Inc. For: Apr 13 | SEC filing · Form 6-K | SEC EDGAR | -2.85% | +7.64% | |
| Arqit Quantum Inc. Announces Select Preliminary Financial Results for the First Half of Fiscal Year 2026 | Press release | GlobeNewswire | -2.85% | +7.64% | |
| Quantum Secure Encryption Corp. announces official launch of QPA v2, its enterprise post-quantum cryptographic migration platform | Press release | Canada Newswire | -0.07% | -0.67% | |
| Quantum Threats Are Real. These Companies Are Building the Fix | Press release | PR Newswire | +0.38% | -3.75% | |
| Form 6-K Arqit Quantum Inc. For: Mar 04 | SEC filing · Form 6-K | SEC EDGAR | +0.43% | -1.97% | |
| Arqit and RAD announce Quantum-Safe collaboration Against Evolving Cyberthreats | Press release | GlobeNewswire | +0.19% | +7.25% | |
| Arqit and 6WIND launch technology and product integrations for Quantum-Safe services delivered by Telco Service Providers | Press release | GlobeNewswire | -0.34% | +5.06% | |
| Form EFFECT Arqit Quantum Inc. | SEC filing · Form EFFECT | SEC EDGAR | +1.53% | +1.61% | |
| Form F-3/A Arqit Quantum Inc. | SEC filing · Form F-3 | SEC EDGAR | -1.92% | -5.17% | |
| Form 6-K Arqit Quantum Inc. For: Jan 12 | SEC filing · Form 6-K | SEC EDGAR | -1.51% | +1.72% | |
| Form F-3 Arqit Quantum Inc. | SEC filing · Form F-3 | SEC EDGAR | -1.61% | -1.95% | |
| Arqit Quantum Inc. Announces Financial Results for Fiscal Year 2025 | Press release | GlobeNewswire | +3.06% | +5.56% | |
| Form 20-F Arqit Quantum Inc. For: Sep 30 | SEC filing · Form 20-F | SEC EDGAR | +3.06% | +5.56% | |
| Form 6-K Arqit Quantum Inc. For: Dec 09 | SEC filing · Form 6-K | SEC EDGAR | +3.06% | +5.56% | |
| Arqit Quantum Inc. Sets Fiscal year 2025 Conference Call for Tuesday, December 9, 2025 at 11:00 a.m. ET | Press release | GlobeNewswire | -1.21% | -3.40% | |
| Quantum Entropy, Rising Hacks, and a Hardware Shift Now Forcing Security Overhauls | Press release | PR Newswire | +0.63% | -1.06% | |
| Form 6-K Arqit Quantum Inc. For: Oct 21 | SEC filing · Form 6-K | SEC EDGAR | -0.24% | -1.14% | |
| Arqit Quantum Inc. Announces Select Preliminary Financial Results for the Second Half and Full Fiscal Year 2025 | Press release | GlobeNewswire | +5.11% | +3.62% | |
| Form 6-K Arqit Quantum Inc. For: Oct 09 | SEC filing · Form 6-K | SEC EDGAR | +5.11% | +3.62% | |
| Form EFFECT Arqit Quantum Inc. | SEC filing · Form EFFECT | SEC EDGAR | -6.86% | +2.51% | |
| Form 6-K Arqit Quantum Inc. For: Sep 15 | SEC filing · Form 6-K | SEC EDGAR | +3.34% | -1.25% | |
| Form F-3/A Arqit Quantum Inc. | SEC filing · Form F-3 | SEC EDGAR | +3.34% | -1.25% | |
| Form 6-K Arqit Quantum Inc. For: Sep 11 | SEC filing · Form 6-K | SEC EDGAR | +0.13% | +11.40% | |
| Form F-3 Arqit Quantum Inc. | SEC filing · Form F-3 | SEC EDGAR | +1.94% | -1.98% | |
| Form 6-K Arqit Quantum Inc. For: Aug 28 | SEC filing · Form 6-K | SEC EDGAR | +1.34% | +1.66% | |
| Arqit Joins Oracle Defense Ecosystem | Press release | GlobeNewswire | +0.21% | +9.53% | |
| Arqit Quantum Inc. Announces Financial Results for First Half of Fiscal Year 2025 | Press release | GlobeNewswire | -0.46% | +4.30% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the ARQQ section they belong to.
Where else ARQQ is measured.
ARQQ earnings → · Analyst actions → · SEC filings →
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How the numbers are made.
How is Arqit Quantum Inc. - Ordinary Shares's median reaction calculated?
Every labeled ARQQ news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 416 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 54% of ARQQ's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does ARQQ's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.