Company · Ownership research

Energy Recovery, Inc. ERII

CIK 0001421517

Form 4 transactions dated Sep 1, 2023 to Sep 26, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

Insider filings on file run through 2026-07-29.

Insider purchases & sales

Purchased: $1.11M
Sold: $16.55M

Sep 1, 2023 – Jul 29, 2026
Available records · partial months are marked ·

2023, from Sep 1, 20238 of 8 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
2023-11-10	Chow Joan Kai Director	Purchase	$26.68K 1,500 shares bought	New holding Indirect holding	▾
2023-11-09	Moon David W Interim President and CEO · Director	Purchase	$153.94K 8,500 shares bought	New holding Indirect holding	▾
2023-11-09	Sabol Colin R Director	Purchase	$36.00K 2,000 shares bought	200.00% added Indirect holding	▾
2023-11-07	Mao Robert Yu Lang Director	Sale	$2.19M 121,383 shares sold	53.71% sold Direct holding	▾
2023-11-07	TONDREAU PAMELA L. Director	Purchase	$149.54K 8,350 shares bought	56.54% added Direct holding	▾
2023-11-06	Mao Robert Yu Lang Director	Sale	$2.31M 130,000 shares sold	66.29% sold Direct holding	▾
2023-11-06	Sabol Colin R Director	Purchase	$17.75K 1,000 shares bought	New holding Indirect holding	▾
2023-09-12	Ballard Joshua Chief Financial Officer	Sale	$16.82K 700 shares sold	100.00% sold Indirect holding	▾

Showing 8 / 8 record groups in 2023. The complete set is available through the API.

Energy Recovery, Inc. · ERII

Follow the people behind the trades.

Sign in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and reach other datasets through the Akkru API.

Download CSV
Earlier filings
Advanced screening & filtering
API & AI access

Already have an account?

＋ New accounts get free API credits to explore data beyond ownership filings.

For AI agents & developers

The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. For the year shown, this page lists 8 of 8 purchase / sale groups and 15 of 15 other groups; the totals and the monthly series cover the whole window.

Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP.

MCP  https://api.akkrudata.ai/mcp

list_insider_transactions
{"ticker":"ERII","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

Connect to MCP with OAuth and follow the returned pagination. Credits and usage limits depend on the account.

MCP endpoint: https://api.akkrudata.ai/mcp
API / MCP documentation: /documents
llms.txt: /llms.txt

Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.