Are insiders buying ERII stock?

Yes — 4 distinct insiders have bought ERII (Energy Recovery, Inc.) on the open market, including 1 cluster buy where two or more insiders bought within a rolling window. The most recent qualifying activity was May 15, 2026.

How much ERII stock have insiders bought?

Insiders have bought a combined $459.0K of ERII across 5 open-market purchases, based on SEC Form 4 filings.

What is an insider cluster buy in ERII?

A cluster buy is two or more distinct Energy Recovery, Inc. insiders — officers, directors, or 10% owners — each buying ERII on the open market within a rolling window. ERII has 1 detected cluster buy to date.

Where does this ERII insider trading data come from?

Every figure is parsed directly from SEC Form 4 filings on EDGAR, and each purchase on this page links back to its original filing document.

ERII insider buying

1 cluster buy

Energy Recovery, Inc. · Industrials

When two or more insiders at Energy Recovery, Inc. buy ERII on the open market around the same time, that clustered conviction is one of the highest-signal patterns in SEC filing data. Below is every cluster we've detected in ERII plus the full record of qualifying open-market buys, each parsed directly from Form 4 filings and linked back to the source on SEC EDGAR.

Clusters

Distinct insiders

Total bought

$459.0K

Market cap

$463.9M

Detected clusters

May 13 – May 14, 2025
Detected May 14, 2025
High conviction2 insiders
Total bought
$102.8K
Market cap
$463.9M

All notable open-market buys in ERII

Every open-market Form 4 purchase, newest first. Click an insider to see their full buying record across companies.

Date	Insider	Shares	Price	Value	Filing
May 13, 2026	TONDREAU PAMELA L. Director	20,000	$8.34	$166.8K	SEC ↗
May 14, 2025	TONDREAU PAMELA L.cluster Director	4,200	$12.28	$51.6K	SEC ↗
May 13, 2025	Moon David Wcluster Director, President and CEO	4,200	$12.20	$51.2K	SEC ↗
Aug 5, 2024	Moon David W Director, President and CEO	3,000	$16.00	$48.0K	SEC ↗
May 7, 2024	Moon David W Director, President and CEO	10,500	$13.46	$141.3K	SEC ↗

More Industrials stocks with insider cluster buys

All insider buying in Industrials →

ERII insider buying — FAQ

Are insiders buying ERII stock?: Yes — 4 distinct insiders have bought ERII (Energy Recovery, Inc.) on the open market, including 1 cluster buy where two or more insiders bought within a rolling window. The most recent qualifying activity was May 15, 2026.
How much ERII stock have insiders bought?: Insiders have bought a combined $459.0K of ERII across 5 open-market purchases, based on SEC Form 4 filings.
What is an insider cluster buy in ERII?: A cluster buy is two or more distinct Energy Recovery, Inc. insiders — officers, directors, or 10% owners — each buying ERII on the open market within a rolling window. ERII has 1 detected cluster buy to date.
Where does this ERII insider trading data come from?: Every figure is parsed directly from SEC Form 4 filings on EDGAR, and each purchase on this page links back to its original filing document.

How we track insider buying in ERII

We continuously poll SEC EDGAR for new Form 4 filings and parse every open-market purchase (transaction code P). A cluster is recorded when two or more distinct insiders — officers, directors, or 10% owners — each buy ERII within a rolling window. We track clusters at every company size, from micro-caps to mega-caps. Every figure on this page traces back to an official filing; open any row to jump straight to the source document. What counts as a cluster buy?

This page is informational and reflects public filing data. It is not investment advice or a recommendation regarding ERII.