Which has the lower trailing P/E, ERII or MNTK?

ERII has the lower trailing P/E: ERII trades at 24.99 and MNTK at 51.63. P/E is one valuation measure and does not by itself establish which business is cheaper.

Which has grown faster, ERII or MNTK?

Over the past five years, MNTK grew revenue faster — ERII at a 3.08% CAGR versus MNTK at 10.23%.

Is ERII or MNTK more profitable?

ERII runs the higher net margin — ERII at 12.75% versus MNTK at 4.19%.

How have ERII and MNTK total returns compared?

Over the past 5 years, ERII delivered -18.87% and MNTK delivered -26.03% annualized total return. Past performance doesn't predict future results.

Energy Recovery, Inc. (ERII) vs Montauk Renewables, Inc. (MNTK)

A side-by-side comparison of Energy Recovery, Inc. and Montauk Renewables, 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

$7.06IndustrialsDelayed quote: Oct 6, 2026, 11:30 AM EDT

MNTK

Montauk Renewables, Inc.

$407M

$2.86IndustrialsDelayed quote: Oct 6, 2026, 11:25 AM EDT

Total return — ERII vs MNTK

growth of $100 · dividends reinvested · last 6y

ERII -52.8% (-11.8%/yr)MNTK -75.2% (-20.7%/yr)ERII compounded faster over this window

ERII MNTK

ERII vs MNTK: by the numbers

•MNTK is the larger company ($407M vs $364M market cap).
•ERII trades at the lower trailing earnings multiple (24.99 vs 51.63 P/E), one valuation lens rather than an overall verdict.
•ERII converts more revenue to profit (12.75% vs 4.19% net margin).
•MNTK grew revenue faster over the past five years (10.23% vs 3.08% CAGR).

Metrics side by side

Valuation

Metric	ERII	MNTK
P/E ratio	24.99	51.63
Forward P/E	N/A	24.99
P/S ratio	3.03	2.15
P/B ratio	2.11	1.54
EV / EBITDA	10.05	15.49
FCF yield	10.61%	N/A

Profitability

Metric	ERII	MNTK
Gross margin	65.39%	34.69%
Operating margin	16.40%	1.23%
Net margin	12.75%	4.19%
ROE	8.89%	3.00%
ROIC	9.61%	0.55%

Growth (annualized)

Metric	ERII	MNTK
Revenue CAGR (5Y)	3.08%	10.23%
EPS CAGR (5Y)	-1.76%	-17.75%
FCF CAGR (5Y)	10.08%	N/A
Total return CAGR (5Y)	-18.87%	-26.03%

Frequently asked

Which has the lower trailing P/E, ERII or MNTK?: ERII has the lower trailing P/E: ERII trades at 24.99 and MNTK at 51.63. P/E is one valuation measure and does not by itself establish which business is cheaper.
Which has grown faster, ERII or MNTK?: Over the past five years, MNTK grew revenue faster — ERII at a 3.08% CAGR versus MNTK at 10.23%.
Is ERII or MNTK more profitable?: ERII runs the higher net margin — ERII at 12.75% versus MNTK at 4.19%.
How have ERII and MNTK total returns compared?: Over the past 5 years, ERII delivered -18.87% and MNTK delivered -26.03% annualized total return. Past performance doesn't predict future results.

Go deeper

Full ERII analysis Full MNTK analysis Interactive comparison tool

Dig into the metrics

Energy Recovery P/E ratio Montauk Renewables P/E ratio Energy Recovery ROE Montauk Renewables ROE Energy Recovery operating margin Montauk Renewables operating margin Energy Recovery revenue growth Montauk Renewables revenue growth Energy Recovery free cash flow Montauk Renewables free cash flow

Energy Recovery & Montauk Renewables 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.