Ticker · CUSIP 29270J100

ERII

ENERGY RECOVERY INC

Industrials·Pollution & Treatment Controls

···Share

Holders (tracked)

Combined shares

1,201,195

Combined value

$16.20M

Last close

$10.58

Quarter

2025Q4

Price is -21.6% vs the avg quarter-end implied price across tracked holders.

Price · 1Y$10.58-4.25 (-28.66%)H $18.11 · L $9.46 · Avg Vol 532K

Tracked holders · last 8 quarters

-1 vs previous quarter over the last 8.

SEC event timeline

13 events

Ken Griffin (Citadel Advisors) added2026-02-17
+86,767 shares · 2025Q4
Position
D.E. Shaw & Co. trimmed2026-02-17
−283,706 shares · 2025Q4
Position
Izzy Englander (Millennium Mgmt) added2026-02-17
+66,457 shares · 2025Q4
Position
T. Rowe Price added2026-02-17
+5,798 shares · 2025Q4
Position
Wellington Management trimmed2026-02-17
−1,907 shares · 2025Q4
Position
AQR Capital Management trimmed2026-02-17
−9,547 shares · 2025Q4
Position
Renaissance Technologies added2026-02-12
+47,385 shares · 2025Q4
Position
AQR Capital Management added2025-11-14
+4,452 shares · 2025Q3
Position
Wellington Management opened position2025-11-14
+302,525 shares · 2025Q3
Position
D.E. Shaw & Co. trimmed2025-11-14
−26,891 shares · 2025Q3
Position
T. Rowe Price added2025-11-14
+5,491 shares · 2025Q3
Position
Izzy Englander (Millennium Mgmt) added2025-11-14
+31,250 shares · 2025Q3
Position
Renaissance Technologies trimmed2025-11-13
−85,500 shares · 2025Q3
Position

Insider activity

No insider transactions in the last 30 days.

View full insider history for ERII →

Follow-the-investor returns

If you'd copied each holder of ERII…

Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.

Investor	First in	Cost basis	Return	Position value today
Ken Griffin (Citadel Advisors)	2016Q1	$13.61	-22.3%	$545K
Ken Griffin (Citadel Advisors)	2016Q1	$13.61	-22.3%	$545K
T. Rowe Price	2017Q1	$14.11	-25.0%	$568K
D.E. Shaw & Co.	2016Q1	$14.61	-27.6%	$668K
Izzy Englander (Millennium Mgmt)	2016Q1	$14.93	-29.1%	$2.1M
Renaissance Technologies	2016Q1	$15.35	-31.1%	$1.1M
AQR Capital Management	2016Q2	$15.65	-32.4%	$171K
Wellington Management	2016Q2	$16.16	-34.5%	$3.2M

Who moved on this name in 2025Q4

Position changes reported for the latest quarter, grouped by direction.

New positions0

—

Added to4

Ken Griffin (Citadel Advisors)
+86,767
$1.2M
Izzy Englander (Millennium Mgmt)
+66,457
$897K
Renaissance Technologies
+47,385
$639K
T. Rowe Price
+5,798
$78

Trimmed3

D.E. Shaw & Co.
−283,706
$3.8M
AQR Capital Management
−9,547
$129K
Wellington Management
−1,907
$26K

Exited0

—

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.

Quarter	Holders	Shares	Combined value	Δ holders
2022Q1	8	4,267,228	$85.9M	—
2022Q2	10	4,848,642	$1.66B	+2
2022Q3	10	5,016,107	$109.1M	—
2022Q4	10	5,416,057	$111.0M	—
2023Q1	10	5,610,168	$129.3M	—
2023Q2	9	5,097,867	$142.5M	-1
2023Q3	9	5,269,485	$111.8M	—
2023Q4	9	5,715,839	$107.7M	—
2024Q1	11	5,815,957	$91.8M	+2
2024Q2	10	6,845,400	$91.0M	-1
2024Q3	8	1,923,933	$33.5M	-2
2024Q4	11	2,104,817	$30.9M	+3
2025Q1	10	2,246,389	$35.7M	-1
2025Q2	8	758,680	$9.7M	-2
2025Q3	9	1,309,948	$20.2M	+1
2025Q4	8	1,201,195	$16.2M	-1

Who owns ERII

8 super-investors · 2025Q4

Tracked stake

1.20M

Combined value

$16M

% of shares outstanding

—

shares-out unknown

Quarter action mix

Added5Trim3

#	Manager	Shares	Value	% of book	Last action
1	Ken Griffin Citadel Advisors	418.6K	$6M	0.0%	Added+86.8K
2	Wellington Management	300.6K	$4M	0.0%	Trim−1.9K
3	Izzy Englander Millennium Mgmt	194.5K	$3M	0.0%	Added+66.5K
4	Renaissance Technologies	103.0K	$1M	0.0%	Added+47.4K
5	D.E. Shaw & Co.	63.1K	$851K	0.0%	Trim−283.7K
6	T. Rowe Price	53.7K	$725K	0.0%	Added+5.8K
7	Ken Griffin Citadel Advisors	51.5K	$695K	0.0%	Added+86.8K
8	AQR Capital Management	16.2K	$218K	0.0%	Trim−9.5K

Recent moves

20 transactions

TRIMD.E. Shaw & Co.
−283,706 · 2025Q4
ADDIzzy Englander (Millennium Mgmt)
+66,457 · 2025Q4
TRIMWellington Management
−1,907 · 2025Q4
ADDT. Rowe Price
+5,798 · 2025Q4
ADDKen Griffin (Citadel Advisors)
+86,767 · 2025Q4
TRIMAQR Capital Management
−9,547 · 2025Q4
ADDRenaissance Technologies
+47,385 · 2025Q4
NEWWellington Management
+302,525 · 2025Q3
ADDIzzy Englander (Millennium Mgmt)
+31,250 · 2025Q3
TRIMD.E. Shaw & Co.
−26,891 · 2025Q3
ADDAQR Capital Management
+4,452 · 2025Q3
ADDT. Rowe Price
+5,491 · 2025Q3
TRIMRenaissance Technologies
−85,500 · 2025Q3
SOLDTwo Sigma Investments
−53,441 · 2025Q2
ADDAQR Capital Management
+7,881 · 2025Q2
TRIMIzzy Englander (Millennium Mgmt)
−79,661 · 2025Q2
ADDT. Rowe Price
+1,166 · 2025Q2
ADDD.E. Shaw & Co.
+111,053 · 2025Q2
TRIMRenaissance Technologies
−100,400 · 2025Q2
SOLDBaillie Gifford & Co
−1,099,276 · 2025Q2

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