Quantum-Si price to book ratio QSI

Market value divided by the book value of the company's net assets, since 2020.

Today, Oct 23, 2026: 1.7×
6-year median: 1.0×
Against its 6-year history: 78th; percentile: 0 is its lowest day, 100 its highest
6-year range: 0.5× to 60.6×
Peer median: 3.3×

Quantum-Si's price to book ratio is 1.7× as of Oct 23, 2026.

That is above its 6-year median of 1.0×, higher than on 78% of days in the last 6 years.

Over that time it ranged from 0.5× in Oct 2024 to 60.6× in Feb 2021.

The median for 10 industrial machinery stocks of a similar size is 3.3×.

Price to book ratio over time

Open the interactive chart, with overlays and comparisons

Year by year

Year	End of year	Low	High
2026 so far	1.7×	0.7×	1.9×
2025	1.1×	0.9×	2.9×
2024	2.4×	0.5×	2.4×
2023	1.0×	0.5×	1.4×
2022	0.7×	0.7×	1.8×
2021	2.2×	1.6×	60.6×
2020	30.0×	29.2×	34.0×

Against its peers

Companies in Industrial - Machinery nearest Quantum-Si's size, closest first, today.

Company	Price to book ratio
QSIQuantum-Si	1.7×
TWINTwin Disc	1.6×
PPIHPerma-Pipe International	2.5×
LYTSLSI Industries	2.1×
GHMGraham	4.0×
PSIXPower Solutions International	5.2×
TNCTennant	2.1×
ENREnergizer	7.6×
EPACEnerpac Tool	4.3×
SPBSpectrum Brands	1.0×
GRCGorman Rupp	4.4×
Peer median	3.3×

What the price to book ratio tells you

Market value divided by the accounting value of the company's net assets. Below 1 means the market values the business at less than what it owns on paper.

Book value misses brands, software and people, so asset-light companies always look expensive on it. Most useful for banks and industrials.

More on Quantum-Si

Valuation data, not investment advice. Prices as of Oct 23, 2026. Reported figures come from the company's filings with the SEC.