Publicly Traded Quantum — 2026-05-18
Published:
Generated: 2026-05-18 UTC. Prices are last available daily close from Yahoo Finance and are informational only — not investment advice.
Companies
Quantum-primary publicly traded companies (quantum hardware, software, or quantum-enabled products as the core business). Diversified mega-caps with quantum divisions (Google, IBM, Microsoft, Amazon, etc.) are intentionally excluded.
| Ticker | Company | HQ | Focus | Last close | Δ vs prev close | 30d |
|---|---|---|---|---|---|---|
| IONQ | IonQ | College Park, MD, USA | Trapped-ion quantum computers | $49.31 | -5.08% | |
| RGTI | Rigetti Computing | Berkeley, CA, USA | Superconducting quantum hardware | $16.62 | -6.89% | |
| QBTS | D-Wave Quantum | Burnaby, BC, Canada | Quantum annealing | $19.06 | -6.34% | |
| QUBT | Quantum Computing Inc. (QCI) | Hoboken, NJ, USA | Photonic / entropy quantum systems | $9.72 | -7.52% | |
| ARQQ | Arqit Quantum | London, UK | Symmetric quantum-safe encryption | $12.74 | -4.50% | |
| QSI | Quantum-Si | Branford, CT, USA | Quantum-enabled protein sequencing | $0.85 | -4.06% | |
| LAES | SEALSQ | Geneva, Switzerland | Post-quantum secure semiconductors | $2.79 | -2.79% |
ETFs
Broad-basket exchange-traded funds that track quantum-computing and adjacent quantum-tech holdings.
| Ticker | Fund | Listing | Focus | Last close | Δ vs prev close | 30d |
|---|---|---|---|---|---|---|
| QTUM | Defiance Quantum ETF | USA | Broad quantum-computing ETF | $141.97 | -0.78% |
Leaderboard (1-day move)
**Top gainers**
- Defiance Quantum ETF (QTUM) — -0.78%
- SEALSQ (LAES) — -2.79%
- Quantum-Si (QSI) — -4.06%
- Arqit Quantum (ARQQ) — -4.50%
- IonQ (IONQ) — -5.08%
- Quantum Computing Inc. (QCI) (QUBT) — -7.52%
- Rigetti Computing (RGTI) — -6.89%
- D-Wave Quantum (QBTS) — -6.34%
- IonQ (IONQ) — -5.08%
- Arqit Quantum (ARQQ) — -4.50%