Which has grown faster, ERII or PESI?

Over the past five years, ERII grew revenue faster — ERII at a 3.08% CAGR versus PESI at -10.18%.

Is ERII or PESI more profitable?

ERII runs the higher net margin — ERII at 12.75% versus PESI at -37.04%.

How have ERII and PESI total returns compared?

Over the past 10 years, ERII delivered -8.05% and PESI delivered 11.56% annualized total return. Past performance doesn't predict future results.

Energy Recovery, Inc. (ERII) vs Perma-Fix Environmental Services, Inc. (PESI)

A side-by-side comparison of Energy Recovery, Inc. and Perma-Fix Environmental Services, Inc. across valuation, profitability, dividends, and growth — built entirely from reported fundamentals, as of October 6, 2026. Differences are shown without an overall score or investment verdict.

ERII

Energy Recovery, Inc.

$364M

$7.07IndustrialsDelayed quote: Oct 6, 2026, 11:55 AM EDT

PESI

Perma-Fix Environmental Services, Inc.

$333M

$15.72IndustrialsDelayed quote: Oct 6, 2026, 11:55 AM EDT

Total return — ERII vs PESI

growth of $100 · dividends reinvested · last 10y

ERII -56.8% (-8.0%/yr)PESI +196.2% (+11.5%/yr)PESI compounded faster over this window

Log scale — wide-divergence pair

ERII PESI

ERII vs PESI: by the numbers

•ERII is the larger company ($364M vs $333M market cap).
•ERII is profitable (12.75% net margin) while PESI runs a net loss (-37.04%).
•ERII grew revenue faster over the past five years (3.08% vs -10.18% CAGR).

Metrics side by side

Valuation

Metric	ERII	PESI
P/E ratio	25.01	N/A
P/S ratio	3.03	5.83
P/B ratio	2.11	5.71
EV / EBITDA	10.06	N/A
FCF yield	10.60%	N/A

Profitability

Metric	ERII	PESI
Gross margin	65.39%	9.59%
Operating margin	16.40%	-19.03%
Net margin	12.75%	-37.04%
ROE	8.89%	-36.31%
ROIC	9.61%	-25.42%

Growth (annualized)

Metric	ERII	PESI
Revenue CAGR (5Y)	3.08%	-10.18%
EPS CAGR (5Y)	-1.76%	N/A
FCF CAGR (5Y)	10.08%	N/A
Total return CAGR (5Y)	-18.87%	17.15%

Frequently asked

Which has grown faster, ERII or PESI?: Over the past five years, ERII grew revenue faster — ERII at a 3.08% CAGR versus PESI at -10.18%.
Is ERII or PESI more profitable?: ERII runs the higher net margin — ERII at 12.75% versus PESI at -37.04%.
How have ERII and PESI total returns compared?: Over the past 10 years, ERII delivered -8.05% and PESI delivered 11.56% annualized total return. Past performance doesn't predict future results.

Go deeper

Full ERII analysis Full PESI analysis Interactive comparison tool

Dig into the metrics

Energy Recovery P/E ratio Energy Recovery ROE Perma-Fix Environmental Services ROE Energy Recovery operating margin Perma-Fix Environmental Services operating margin Energy Recovery revenue growth Perma-Fix Environmental Services revenue growth Energy Recovery free cash flow Perma-Fix Environmental Services free cash flow

Energy Recovery & Perma-Fix Environmental Services appear in these rankings

Highest FCF Yield Stocks

Figures are sourced from reported fundamentals and the latest end-of-day price. This comparison is informational only and is not investment advice. Past performance does not predict future results. See our methodology. Compiled by TGMCharts Research · data verified October 6, 2026.