Quantum-Si (QSI) vs SES AI (SES)
Head-to-head comparison of performance, valuation, growth, profitability and dividends. Prices delayed 15 minutes; data as of Oct 8, 2026.
Summary
Quantum-Si (QSI) has outperformed SES AI (SES) over the past year, losing 27.7% versus a loss of 73.2%. Over five years, QSI leads with a -85.1% price change compared with -92.7% for SES. SES AI is the larger company by market cap ($291.8 million vs $267.0 million), about 1.1 times the size.
Summary generated from market data by MetaCap's automated system. Methodology
Relative performance
Percent change in share price from the first common trading day shown; excludes dividends.
Head-to-head
| Metric | QSI | SES |
|---|---|---|
| Share price | $1.22 | $0.786 |
| Market cap | $267.04M | $291.83M |
| 1-day change | -4.69% | +8.37% |
| YTD return | +16.36% | -59.71% |
| 1-year return | -27.68% | -73.24% |
| 5-year return | -85.12% | -92.70% |
| EPS (TTM) | $-0.45 | $-0.20 |
| Dividend yield | 0.00% | 0.00% |
| Annual dividend | $0.00 | $0.00 |
| 52-week high | $3.10 | $3.73 |
| 52-week low | $0.69 | $0.491 |
| Distance from 52-week high | -60.65% | -78.93% |
| Analyst consensus | buy | none |
| Avg. price target upside | +86.89% | +224.43% |
| Average volume | 4.10M | 19.05M |
| Shares outstanding | 198.95M | 327.41M |
| Employees | 145 | 215 |
| Sector | Industrials | Miscellaneous |
| Industry | Industrial Machinery/Components | Industrial Machinery/Components |
Highlighted cells mark the higher value for growth, returns, margins and yield, and the lower value for P/E ratios. Highlighting is a mechanical comparison, not a recommendation.
Key differences
- QSI has outperformed SES by 45.6 percentage points over the past year.
- The two companies sit in different sectors: Quantum-Si in Industrials and SES AI in Miscellaneous.
About Quantum-Si
QSI stock →Quantum-Si incorporated, a life sciences company, develops proprietary, universal, and single-molecule detection platform applied to proteomics to enable next-gen protein sequencing (NGPS). The company offers Platinum and Platinum Pro NGPS instruments for single-molecule, amino acid level resolution, and automated data analysis; library preparation kits to prepare a customer's protein sample for sequencing; and sequencing kits, which contain the reagents and consumables used to perform NGPS.
Industrials · Industrial Machinery/Components · 145 employees
About SES AI
SES stock →SES AI Corporation develops and produces AI enhanced lithium metal and lithium-ion rechargeable battery technologies for electric vehicles, urban air mobility, drones, robotics, battery energy storage systems, and other applications. It manufactures and sells residential and commercial ESS systems, li-ion, li metal battery cells and battery materials, such as electrolytes for automotive original equipment manufacturers and others.
Miscellaneous · Industrial Machinery/Components · 215 employees
QSI vs SES FAQ
Which is bigger, Quantum-Si or SES AI?
SES AI (SES) is larger, with a market capitalization of $291.83M compared with $267.04M for Quantum-Si (QSI).
Which stock has performed better over the past year, QSI or SES?
QSI returned -27.68% over the past 12 months, compared with -73.24% for SES (price return, excluding dividends). Past performance does not predict future results.
Are Quantum-Si and SES AI in the same industry?
Yes. Both are classified in the Industrial Machinery/Components industry within the Industrials sector.