Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

Energy Recovery, Inc.

ERII · Nasdaq · CIK 0001421517 · Industrials · Pollution & Treatment Controls

INSIDER SIGNAL

44.4 / 100

2 buyers · 2 purchase transaction lines · $266.1K gross purchase

WHY THIS SIGNAL?

Buyer breadthLow
Purchase sizeLow
RoleStrong
RecencyLow
ConvictionLow
Score anatomy

Each bar shows the contribution to the current score; the weights and formula stay unchanged.

Cluster+14.0 / 35
Purchase size+6.4 / 25
Role+20.0 / 20
Recency+1.2 / 10
Conviction+2.7 / 10

What is holding the score back?

  • ⚠ Cluster breadth is moderate · 2 insider(s), not 4+
  • ⚠ Purchase size is modest relative to the model scale
  • ⚠ Purchase activity is becoming less recent
  • ⚠ Buying conviction is reduced by concurrent selling
  • ✓ Role scores high · most senior buyer: Director

Purchase-size comments are relative to the model scale. Average daily volume is a separate market-context diagnostic.

US-v1.2 ranks qualifying equity purchases under the current 180-day rules. The score is a research priority, not a return forecast or probability. Backtests have not shown that a higher US score is followed by better returns.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
Sabol Colin RDirector
○●
BUEHLER ALEXANDER JInterim President and CEO
○▼
TONDREAU PAMELA L.Director
●○
Clemente RodneySVP, Water
○▼
Yeung WilliamChief Legal Officer
○▼
Chow Joan KaiDirector
○
● Purchase▼ Sale○ Other

Showing the six most active owners; 3 additional owner(s) remain in Form 4 evidence.

Purchase breadth & concentration

QUALIFYING BUYERS2
PURCHASE CONCENTRATION63%Largest buyer: TONDREAU PAMELA L. · $166.8K
CLUSTER BUYING · 15D1 insiderPeak activity: 2026-05-13–2026-05-13

Roles in the peak window: Director. Concentration uses priced qualifying P lines only and does not change the saved score.

SIGNAL HISTORY

44.4 / 100

Latest recorded score

→ +0.0 ptsversus the previous recorded snapshot
  1. 44.6
  2. 44.5
  3. 44.5
  4. 44.4
  5. 44.4

Only scores saved when a full US scoring run completed are shown; gaps are not reconstructed.

Recent Form 4 activity

2Purchases
21Sales
27Other Form 4 lines
34SEC filings · 365 days
BUYING2 qualifying P line(s) · 180 days
SELLING3 sale line(s) · context only
OTHER9 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context provides additional background on recent price performance and risk. It does not affect the Insider Signal.

Price performance

1M
-5.9%
3M
-21.0%
6M
-38.4%
12M
-55.7%

Volatility & liquidity

Volatility
51.3%
Beta
—
Avg daily value
USD 6.4M

Valuation

Market cap
USD 349.1M
P/E
15.2×

Fundamentals

Profit margin
17.0%
ROE
11.1%
Industry
Pollution & Treatment Controls

Market data

Price data up to: 2026-10-11 · Price source: OpenBB/yfinance; volume from price cache (yfinance) · From SEC filings: Market cap, P/E, Profit margin, ROE · Fiscal year ended: 2025-12-31 · Market cap is the shares outstanding stated on the filing cover multiplied by the latest close. Share count date: 2026-07-31 · Status: PASS

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
3,321,523
Previous report
3,431,138
Avg daily volume
897,776
Days to cover
3.7

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2026-06-15Sabol Colin RPurchase (P)Common Stock11,180USD 8.88USD 99,278SEC filing ↗
2026-05-13TONDREAU PAMELA L.Purchase (P)Common Stock20,000USD 8.34USD 166,800SEC filing ↗
2025-05-14TONDREAU PAMELA L.Purchase (P)Common Stock4,200USD 12.28USD 51,576SEC filing ↗
2025-05-13Moon David WPurchase (P)Common Stock4,200USD 12.20USD 51,240SEC filing ↗
2024-08-05Moon David WPurchase (P)Common Stock3,000USD 16.00USD 48,000SEC filing ↗
2024-05-07Moon David WPurchase (P)Common Stock10,500USD 13.46USD 141,330SEC filing ↗
2024-02-27Moon David WPurchase (P)Common Stock10,750USD 15.51USD 166,732SEC filing ↗
2023-11-10Chow Joan KaiPurchase (P)Common Stock1,500USD 17.79USD 26,685SEC filing ↗
2023-11-09Sabol Colin RPurchase (P)Common Stock2,000USD 18.00USD 36,000SEC filing ↗
2023-11-09Moon David WPurchase (P)Common Stock8,500USD 18.11USD 153,935SEC filing ↗
2023-11-07TONDREAU PAMELA L.Purchase (P)Common Stock8,350USD 17.91USD 149,548SEC filing ↗
2023-11-06Sabol Colin RPurchase (P)Common Stock1,000USD 17.75USD 17,750SEC filing ↗
2023-11-06Sabol Colin RPurchase (P)Common Stock1,000USD 17.75USD 17,750SEC filing ↗

Form 4 evidence

50 transaction lines in the latest 365-day window; 459 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-07-28Yeung WilliamSale (S)Common Stock2,048USD 8.56USD 17,531SEC filing ↗
2026-07-28Clemente RodneySale (S)Common Stock5,387USD 8.56USD 46,113SEC filing ↗
2026-07-27Yeung WilliamTax withholding (F)Common Stock2,828USD 8.42USD 23,812SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-07-28Yeung WilliamSale (S)Common Stock2,048USD 8.56USD 17,531SEC filing ↗
2026-07-28Clemente RodneySale (S)Common Stock5,387USD 8.56USD 46,113SEC filing ↗
2026-07-27Yeung WilliamTax withholding (F)Common Stock2,828USD 8.42USD 23,812SEC filing ↗
2026-07-27Clemente RodneyTax withholding (F)Common Stock2,320USD 8.42USD 19,534SEC filing ↗
2026-07-09Mitchell John JosephAward / grant (A)Common Stock16,797USD 0.00USD 0SEC filing ↗
2026-06-15Sabol Colin RPurchase (P)Common Stock11,180USD 8.88USD 99,278SEC filing ↗
2026-06-15BUEHLER ALEXANDER JSale (S)Common Stock14,900USD 8.71USD 129,779SEC filing ↗
2026-06-15BUEHLER ALEXANDER JOption exercise / conversion (M)Common Stock15,327USD 8.60USD 131,812SEC filing ↗
2026-06-04TONDREAU PAMELA L.Award / grant (A)Common Stock22,316USD 8.29USD 185,000SEC filing ↗
2026-06-04Sabol Colin RAward / grant (A)Common Stock18,094USD 8.29USD 149,999SEC filing ↗
2026-06-04Hanstveit ArveAward / grant (A)Common Stock18,094USD 8.29USD 149,999SEC filing ↗
2026-06-04Chow Joan KaiAward / grant (A)Common Stock18,094USD 8.29USD 149,999SEC filing ↗
2026-05-13TONDREAU PAMELA L.Purchase (P)Common Stock20,000USD 8.34USD 166,800SEC filing ↗
2026-05-06Ryan AidanAward / grant (A)Common Stock18,518USD 11.61USD 214,994SEC filing ↗
2026-04-06Hanstveit ArveSale (S)Common Stock2,419USD 10.29USD 24,892SEC filing ↗
2026-04-02Hanstveit ArveSale (S)Common Stock165,292USD 10.14USD 1,676,061SEC filing ↗
2026-03-10Hanstveit ArveSale (S)Common Stock25,000USD 10.96USD 274,000SEC filing ↗
2026-03-06Hanstveit ArveSale (S)Common Stock11,582USD 10.62USD 123,001SEC filing ↗
2026-03-05Hanstveit ArveSale (S)Common Stock38,418USD 10.71USD 411,457SEC filing ↗
2026-03-05Ramanan NatarajanSale (S)Common Stock272USD 10.57USD 2,875SEC filing ↗
2026-03-04Clemente RodneySale (S)Common Stock20,568USD 10.61USD 218,226SEC filing ↗
2026-03-03Ramanan NatarajanTax withholding (F)Common Stock2,724USD 10.22USD 27,839SEC filing ↗
2026-02-17Yeung WilliamAward / grant (A)Common Stock25,959USD 0.00USD 0SEC filing ↗
2026-02-17Ramanan NatarajanAward / grant (A)Common Stock29,106USD 0.00USD 0SEC filing ↗
2026-02-17Moon David WAward / grant (A)Common Stock81,812USD 0.00USD 0SEC filing ↗
2026-02-17Mancini Michael S.Award / grant (A)Common Stock45,626USD 0.00USD 0SEC filing ↗
2026-02-17Hostetler MatthewAward / grant (A)Common Stock25,959USD 0.00USD 0SEC filing ↗
2026-02-17Clemente RodneyAward / grant (A)Common Stock45,626USD 0.00USD 0SEC filing ↗
2026-02-06Yeung WilliamSale (S)Common Stock646USD 15.14USD 9,780SEC filing ↗
2026-02-05Yeung WilliamSale (S)Common Stock890USD 14.59USD 12,985SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerERII
CIK0001421517
SectorIndustrials
IndustryPollution & Treatment Controls Yahoo Finance
SEC SIC3559 Special Industry Machinery, NEC
ExchangeNasdaq

Data coverage

Local Form 4 history459 transaction lines from 2020-01-09 to 2026-07-28
13 P purchase lines · 192 S sale lines · 254 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.