Energy Recovery

ERII on Nasdaq. Energy Recovery sells pressure exchangers to desalination plants and factories. Market value $349m.

Watch this stockFree. We tell you when something changes.

Price checks use the past 12 months to June 2026. Quality checks use five annual reports, the latest for the year to December 2025.

We can't read total debt from the filing, so debt is left out.

Should I look at this?

Worth a closer look

Read what could go wrong

This is not advice. Check the numbers below.

Compare with another stock

Cash yield
past 12 months to June 2026
11.1%very high

For every $100 of what the whole company costs, it produced $11.07 of spare cash in the past 12 months. A savings account pays about $4.

Price to profit
past 12 months to June 2026
n/a

The filings do not give us enough to work this out.

Return on capital
five annual reports to December 2025
n/a

The filings do not give us enough to work this out.

Quality score: 70 of 100. Price score: 74 of 100. Our list needs 70 on quality and 60 on price.

$6.83 a share, 3% above its 1-year low

Over the past year the price has ranged from $6.60 to $18.32.

Pays no dividend

Prices from Monday’s close (5 October).

Five years of cash, in billions

0.0
0.0
0.0
0.0
0.0
0.0
2021202220232024202512 monthsto Jun '26

Spare cash swings from quarter to quarter here: $39 million in the past 12 months, $17 million in the year to December 2025.

Revenue
$104m$126m$128m$145m$135m
Operating margin
13.3%19.8%14.8%13.6%17.7%
Debt to equity
n/an/an/an/an/a
Shares outstanding
0.06bn0.06bn0.06bn0.05bn0.05bn

Health checks

  • Free cash flow positive5 of 5 years
  • Accounting looks honest (Beneish)Not enough data
  • Financial strength (Piotroski)5 of 8 checks we could run
  • Profit backed by cash (accruals)Yes
  • DebtUnknown
  • Revenue growth, five yearsSlow, 2.6% a year
  • Buying back its own sharesYes, 9% fewer since 2021

The quarter to June 2026

How the business did, compared with the same quarter a year earlier.

  • Sales: $12 million last quarter, down 57% on a year ago.
  • A loss of $3 million, after a profit of $2 million a year ago.
  • It keeps 12 cents of each $1 of sales as operating profit, down from 15 cents a year earlier.
  • Spare cash over the past 12 months: $39 million, up from $20 million.
  • 6% fewer shares than a year ago. Each share owns a bit more of the company.
  • Sales grew on a year ago in 1 of the last 4 quarters.
Sales by quarter
Sales by quarter
Quarter toAmount
September 2024$39m
December 2024$67m
March 2025$8m
June 2025$28m
September 2025$32m
December 2025$67m
March 2026$10m
June 2026$12m
Profit by quarter
Profit by quarter
Quarter toAmount
September 2024$8m
December 2024$23m
March 2025-$10m
June 2025$2m
September 2025$4m
December 2025$27m
March 2026-$12m
June 2026-$3m

From the company's quarterly reports to the SEC.

Dates

Next results (estimated)
n/a
Last annual report (10-K)
25 February 2026
Next quarterly (estimated, 10-Q)
4 November 2026

Who owns it

3 long-term investors we follow own it, down from 4 last quarter. 200 funds in all.

Jun '25
Dec '25
Jun '26
Largest holders overall

From 13F filings for the quarter ended 30 June 2026.

Big holders and activists

1 investor owns more than 5%.

From Schedule 13D and 13G filings: anyone owning more than 5% must file one.

What insiders did

In the last 12 months, 2 insiders bought $266,078 of shares on the open market. 5 sold $4m, $712,944 of it under preset trading plans.

  • Clemente Rodney
    SVP, Water
    Sold
    Date
    28 July 2026
    Shares
    5,387
    Price
    $8.56
    Value
    $46,113
  • Yeung William
    Chief Legal Officer
    Sold
    Date
    28 July 2026
    Shares
    2,048
    Price
    $8.56
    Value
    $17,531
  • Sabol Colin R
    Director
    Bought
    Date
    15 June 2026
    Shares
    11,180
    Price
    $8.88
    Value
    $99,278
  • BUEHLER ALEXANDER J
    Interim President and CEO, Director
    Sold
    Date
    15 June 2026
    Shares
    14,900
    Price
    $8.71
    Value
    $129,779
  • TONDREAU PAMELA L.
    Director
    Bought
    Date
    13 May 2026
    Shares
    20,000
    Price
    $8.34
    Value
    $166,800
  • Hanstveit Arve
    Director
    Sold
    Date
    6 April 2026
    Shares
    2,419
    Price
    $10.29
    Value
    $24,892
  • Hanstveit Arve
    Director
    Sold
    Date
    2 April 2026
    Shares
    165,292
    Price
    $10.14
    Value
    $2m
  • Hanstveit Arve
    Director
    Sold
    Date
    10 March 2026
    Shares
    25,000
    Price
    $10.96
    Value
    $274,000
  • Hanstveit Arve
    Director
    Sold
    Date
    6 March 2026
    Shares
    11,582
    Price
    $10.62
    Value
    $123,001
  • Hanstveit Arve
    Director
    Sold
    Date
    5 March 2026
    Shares
    38,418
    Price
    $10.71
    Value
    $411,457

From Form 4 filings: insiders must report trades in their own company's shares within two days.

Warning signs in its filings

Problems the company itself reported to the SEC, in its own words.

None of the warning signs we check for were found.

We look for five warning signs: doubt it can keep going, weak checks on its own accounts, a notice that its past accounts can't be relied on, a change of auditor, and one customer bringing in a big share of sales. We don't check lawsuits, investigations or debt yet.

We checked the auditor's report, internal controls, restatement notices, auditor changes and big customers in the 10-K filed 25 Feb 2026, plus the 10-Q filed 5 Aug 2026 and 5 later 8-Ks.

A 10-K is the yearly report every US company files with the SEC. An 8-K is a short notice of a big event.

What could go wrong

Cheap for a reason is the question the numbers cannot answer.

Whether the price already reflects the risks is what the deep dive is for.

What changed in the risks this year

Companies must list what could hurt them each year. These are the parts that changed since last year’s report.

  • our business, results of operations, or financial condition.

    Could happen
    These recent tariffs and the subsequent retaliatory tariffs could increase the cost of goods for our products or reduce our ability to sell products globally, particularly for our Wastewater business in China, which may adversely affect our operating results and financial condition.
    Read more
  • wind down, which will have an adverse effect on our Emerging Technologies segment financial condition and results of operations.

    For the past decade, the global commercial and industrial refrigeration industry has been shifting away from HFC-based refrigerants to natural refrigerants, such as CO 2 -based refrigerants in response to the global HFC-based refrigerant phase-down and subsequent environmental regulations. We introduced the PX G1300 energy recovery device for use in CO 2 -based refrigeration systems in 2021. While interest in the PX G1300 had been positive, in February 2026, as a result of discussions with OEM and end user customers, we decided to wind down operations in the CO 2 business within our Emerging Technologies segment due to a fundamental change in the business’ outlook. We expect to substantially complete the wind down in the first quarter of 2026, and we will incur costs associated with the wind down which will have an adverse effect on our Emerging Technologies segment financial condition and results of operations.
    Read more
  • tax reform policies, or changes in tax legislation or policies could materially impact our financial position and results of operations.

    Could happen
    Our future effective tax rates could be subject to volatility or adversely affected by changes in tax laws, regulations, accounting principles, or interpretations thereof. For example, on July 4, 2025, the One Big Beautiful Bill Act (“OBBB”) was enacted, which, among other things, allows domestic research and development expenditures to be expensed for tax years beginning on or after January 1, 2025, with retroactive elections for such expenditures paid or incurred in the two prior years, the restoration of 100% bonus depreciation for certain qualified property, modifications to international tax provisions, including provisions addressing the global intangible low-taxed income, foreign-derived intangible income, base erosion anti-abuse tax and controlled foreign corporation rules, and permanently extends certain expiring provisions of the Tax Act described below.
    Read more
  • our business, results of operations, or financial condition.

    Could happen
    Any further unfavorable government policies on international trade, such as capital controls or tariffs, may affect the demand for our products and services, impact the competitive position of our products or prevent us from selling products in certain countries. If any new tariffs, legislation and/or regulations are implemented, or if existing trade agreements are renegotiated, such changes could have an adverse effect on our business, financial condition and results of operations.
    Read more

Read it in the annual report

The deep dive

Everything above is arithmetic on public filings. The deep dive reads the last ten years of annual reports, the proxy statements, and the earnings calls, then argues the case the way Buffett, Klarman, and Hohn would, and checks every claim against the source.

  • What the business is worth, as a range, and the margin of safety at today’s price
  • Prices to start buying, buy, and buy hard
  • The three things that would make this a mistake
  • Every number footnoted to the filing it came from
Create a free account to run it

Your first deep dive is free.

What a finished deep dive looks like

Not advice. Numbers on this page come from SEC filings and are updated each night; prices are updated again after the US market closes. The five-year figures are rounded.