IONQ vs QSI: Which Quantum Stock Is Better?
IonQ (Trapped-Ion) vs Quantum-Si (Quantum Biology) — live market, SEC financial and quantum-hardware data side by side.
IONQ is the larger company at $19.18B market cap, about 95× the size of QSI ($201.23M).
IONQ reports more revenue ($130.02M vs $2.44M for QSI, latest fiscal year).
On cash runway — the metric that decides who needs to raise money first — IONQ is stronger (61mo vs 24mo).
| Metric | IONQIonQ | QSIQuantum-Si |
|---|
| Market |
| Price | $51.40 | $0.9241 |
| Market Cap | $19.18B | $201.23M |
| 1Y Return | +28.2% | -51.4% |
| 52W High | $84.64 | $3.10 |
| 52W Low | $25.89 | $0.69 |
| Financials |
| Revenue (latest FY) | $130.02M | $2.44M |
| Revenue YoY | +201.9% | -20.3% |
| Net Income | $-510,378,000 | $-101,339,000 |
| Cash & Equivalents | $2.04B | $190.40M |
| Cash Runway | 61mo | 24mo |
| Risk |
| Going Concern Flag | No | No |
| ATM Offerings (dilution) | 18 | 29 |
| Daily Short Vol % | 49.8% | 38.8% |
| Beta (1Y vs SPY) | 0.89 | 1.35 |
| Government & Research |
| Federal Awards Total | $302.98M | $30.30M |
| Academic Citations | 38K | — |
| Patents | — | — |
| Quantum Technology |
| Physical Qubits | 100 | — |
| Qubit Modality | #AQ (Algorithmic Qubits) | — |
| 2Q Gate Fidelity | 99.6% | — |
| Cloud Platforms | AWS Braket, Azure Quantum, Google Cloud, IonQ Quantum Cloud | — |
| Roadmap Target | #AQ 64 achieved Sept 2025 (Tempo); 256-qubit chip-based system shipments 2026; 800 logical qubits by 2027; fault-tolerant at scale 2028–2030 | Proteus commercial launch late 2026 (18+ amino acids, ~1,000× throughput); 20 of 20 amino acids by 2027 |
| Company |
| Founded | 2015 | 2017 |
| Headquarters | College Park, MD | Guilford, CT |
| Employees | — | — |
IONQ vs QSI FAQ
Is IONQ or QSI the bigger company?
IONQ is larger, with a market cap of $19.18B versus $201.23M for QSI.
Which has the longer cash runway, IONQ or QSI?
IONQ's cash runway is 61mo and QSI's is 24mo (current cash ÷ trailing-twelve-month operating burn; "CF+" means cash-flow positive).
What technology do IONQ and QSI use?
IonQ (IONQ): #AQ (Algorithmic Qubits). Quantum-Si (QSI): Quantum Biology. Qubit counts are not directly comparable across different modalities.
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