About & methodology
QuantumStock is a focused tracker for publicly traded quantum computing stocks. We exist to answer one question precisely: which public companies actually have quantum computing exposure, and how much? This page explains where our data comes from, how we classify each company, and how often everything updates.
What we track
We currently track 16 companies and funds: 6 pure-plays, 9 diversified holdings with material quantum programs, and 1 quantum-themed ETF. Curation is deliberate — we exclude name-collision tickers (for example Quantum Corporation, a data-storage company, and Quantum-Si, a protein-sequencing company) that have nothing to do with quantum computing.
Where the financial data comes from
Share prices, market capitalisations, and company profiles are sourced from Financial Modeling Prep. Quotes are end-of-day and may be delayed; we do not provide real-time tick data. Every response is validated before it is stored, and we never fabricate a price or market cap — if the data provider returns nothing for a ticker, that ticker is skipped rather than guessed.
How we classify quantum exposure
The financial provider knows nothing about which companies are quantum companies. All quantum classification is editorial and hand-curated by us, not fetched or inferred by an algorithm. Each company is assigned:
- Pure-play — the business is built primarily around quantum computing.
- Diversified — a larger company running a material quantum program (quantum is a small share of revenue).
- ETF — a fund offering basket exposure to the theme.
We also tag each company by segment (hardware, software, or both) and write a short, plain-language thesis explaining the actual quantum angle — IBM's superconducting processors and Qiskit, Honeywell's majority stake in Quantinuum, and so on. Classifications are reviewed as company strategies change.
How often it updates
Prices and market caps refresh on a scheduled job that runs after the US market close on trading days. The curated classification and thesis text are updated editorially whenever a company's quantum strategy materially changes.
Important disclaimer
Informational only — not investment advice. QuantumStock provides data and editorial classification for research purposes only. Nothing on this site is a recommendation to buy, sell, or hold any security. Quantum computing is an early-stage, speculative theme and many of these stocks are highly volatile. Do your own due diligence and consult a licensed financial advisor before investing.
Back to the full list or the best quantum computing stocks.