What is the current 10-day volatility of ERII?

As of today, ERII 10-day volatility is 35.54%

What 10-day volatility category does ERII fall into?

Based on its current 10-day historical volatility, ERII falls into the moderate volatility category

What is ERII 10-day volatility 1-year high?

ERII 10-day volatility reached a 1-year high of 119.06% on May 19, 2025

What is ERII 10-day volatility 1-year low?

ERII 10-day volatility reached a 1-year low of 13.22% on February 19, 2025

What is the current 1-month volatility of ERII?

As of today, ERII 1-month volatility is 29.38%

What 1-month volatility category does ERII fall into?

Based on its current 1-month historical volatility, ERII falls into the moderate volatility category

What is ERII 1-month volatility 1-year high?

ERII 1-month volatility reached a 1-year high of 85.35% on May 17, 2025

What is ERII 1-month volatility 1-year low?

ERII 1-month volatility reached a 1-year low of 18.94% on June 22, 2025

What is the current 3-month volatility of ERII?

As of today, ERII 3-month volatility is 45.38%

What 3-month volatility category does ERII fall into?

Based on its current 3-month historical volatility, ERII falls into the high volatility category

What is ERII 3-month volatility 1-year high?

ERII 3-month volatility reached a 1-year high of 57.87% on May 18, 2025

What is ERII 3-month volatility 1-year low?

ERII 3-month volatility reached a 1-year low of 29.91% on February 19, 2025

What is the current 1-year volatility of ERII?

As of today, ERII 1-year volatility is 41.22%

What 1-year volatility category does ERII fall into?

Based on its current 1-year historical volatility, ERII falls into the high volatility category

What is ERII 1-year volatility 1-year high?

ERII 1-year volatility reached a 1-year high of 53.32% on May 17, 2025

What is ERII 1-year volatility 1-year low?

ERII 1-year volatility reached a 1-year low of 41.17% on December 29, 2025

ERII Stock Volatility History & Chart Since 2008

10-Day

35.54%

January 13, 2026

Summary

Current Value: As of today, ERII 10-day volatility is 35.54%, down -0.86% on January 13, 2026
Value Category: Based on its current 10-day historical volatility, ERII falls into the moderate volatility category
1-Year High: ERII 10-day volatility reached a 1-year high of 119.06% on May 19, 2025
1-Year Low: ERII 10-day volatility reached a 1-year low of 13.22% on February 19, 2025

10-Day Volatility Chart

Performance

ERII Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
10-Day Volatility	Jan 13, 26	35.54%	-0.9%	+40.9%	+74.6%	+55.8%	+13.8%	+11.2%	-30.4%
1-Month Volatility	Jan 13, 26	29.38%	-2.3%	-8.1%	+27.0%	+24.6%	-6.3%	-11.5%	-30.3%
3-Month Volatility	Jan 13, 26	45.38%	-0.3%	+2.8%	+48.5%	+3.8%	-18.5%	-34.9%	+10.1%
1-Year Volatility	Jan 13, 26	41.22%	0.0%	-0.8%	-6.9%	-0.0%	-20.9%	-11.6%	-29.1%
14-Day RSI	Jan 13, 26	52.53	+3.2%	+13.3%	-12.1%	+52.0%	+60.6%	-12.0%	-11.6%
Beta	Jan 13, 26	0.87	0.0%	-3.3%	+2.4%	-2.3%	-3.3%	-23.7%	-17.9%
ATR	Jan 13, 26	$0.38	-2.8%	-17.2%	-1.3%	+6.1%	-32.6%	-42.4%	-32.4%
Price	Jan 13, 26	$14.38	+0.7%	-0.6%	-7.6%	+6.6%	+2.3%	-35.2%	+1.8%
200-Day SMA	Jan 13, 26	$14.29	-0.1%	-1.4%	-0.4%	-0.6%	-8.0%	-32.8%	+57.1%
50-Day SMA	Jan 13, 26	$14.43	-0.4%	-6.4%	-1.9%	-3.5%	-12.1%	-32.3%	+20.2%

10-Day Volatility History

Date	Value	Change
Jan 13, 2026	35.54%	+55.8%
Dec 31, 2025	22.81%	-23.6%
Dec 31, 2024	29.86%	+5.3%
Dec 31, 2023	28.37%	+8.1%
Dec 31, 2022	26.25%	+54.0%
Dec 31, 2021	17.05%	-49.5%
Dec 31, 2020	33.78%	+46.9%
Dec 31, 2019	23.00%	-58.8%
Dec 31, 2018	55.82%	+35.1%
Dec 31, 2017	41.32%	+100.1%

Date	Value	Change
Dec 31, 2016	20.65%	+10.5%
Dec 31, 2015	18.68%	-56.9%
Dec 31, 2014	43.32%	-13.6%
Dec 31, 2013	50.15%	+42.5%
Dec 31, 2012	35.19%	-51.3%
Dec 31, 2011	72.23%	+123.3%
Dec 31, 2010	32.34%	+7.0%
Dec 31, 2009	30.23%	-66.8%
Dec 31, 2008	91.17%	-

FAQ

What is the current 10-day volatility of ERII?
As of today, ERII 10-day volatility is 35.54%
What 10-day volatility category does ERII fall into?
Based on its current 10-day historical volatility, ERII falls into the moderate volatility category
What is ERII 10-day volatility 1-year high?
ERII 10-day volatility reached a 1-year high of 119.06% on May 19, 2025
What is ERII 10-day volatility 1-year low?
ERII 10-day volatility reached a 1-year low of 13.22% on February 19, 2025

1-Month

29.38%

January 13, 2026

Summary

Current Value: As of today, ERII 1-month volatility is 29.38%, down -2.26% on January 13, 2026
Value Category: Based on its current 1-month historical volatility, ERII falls into the moderate volatility category
1-Year High: ERII 1-month volatility reached a 1-year high of 85.35% on May 17, 2025
1-Year Low: ERII 1-month volatility reached a 1-year low of 18.94% on June 22, 2025

Performance

ERII Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
1-Month Volatility	Jan 13, 26	29.38%	-2.3%	-8.1%	+27.0%	+24.6%	-6.3%	-11.5%	-30.3%
10-Day Volatility	Jan 13, 26	35.54%	-0.9%	+40.9%	+74.6%	+55.8%	+13.8%	+11.2%	-30.4%
3-Month Volatility	Jan 13, 26	45.38%	-0.3%	+2.8%	+48.5%	+3.8%	-18.5%	-34.9%	+10.1%
1-Year Volatility	Jan 13, 26	41.22%	0.0%	-0.8%	-6.9%	-0.0%	-20.9%	-11.6%	-29.1%
14-Day RSI	Jan 13, 26	52.53	+3.2%	+13.3%	-12.1%	+52.0%	+60.6%	-12.0%	-11.6%
Beta	Jan 13, 26	0.87	0.0%	-3.3%	+2.4%	-2.3%	-3.3%	-23.7%	-17.9%
ATR	Jan 13, 26	$0.38	-2.8%	-17.2%	-1.3%	+6.1%	-32.6%	-42.4%	-32.4%
Price	Jan 13, 26	$14.38	+0.7%	-0.6%	-7.6%	+6.6%	+2.3%	-35.2%	+1.8%
200-Day SMA	Jan 13, 26	$14.29	-0.1%	-1.4%	-0.4%	-0.6%	-8.0%	-32.8%	+57.1%
50-Day SMA	Jan 13, 26	$14.43	-0.4%	-6.4%	-1.9%	-3.5%	-12.1%	-32.3%	+20.2%

1-Month Volatility History

Date	Value	Change
Jan 13, 2026	29.38%	+27.5%
Dec 31, 2025	23.04%	-36.7%
Dec 31, 2024	36.42%	+5.6%
Dec 31, 2023	34.50%	+28.5%
Dec 31, 2022	26.84%	+27.4%
Dec 31, 2021	21.07%	-34.7%
Dec 31, 2020	32.25%	+42.6%
Dec 31, 2019	22.62%	-54.7%
Dec 31, 2018	49.92%	+19.5%
Dec 31, 2017	41.77%	-0.7%

Date	Value	Change
Dec 31, 2016	42.08%	+15.0%
Dec 31, 2015	36.59%	-27.3%
Dec 31, 2014	50.30%	+31.3%
Dec 31, 2013	38.32%	-15.8%
Dec 31, 2012	45.49%	-46.3%
Dec 31, 2011	84.76%	+105.2%
Dec 31, 2010	41.30%	-12.0%
Dec 31, 2009	46.95%	-60.4%
Dec 31, 2008	118.60%	-

FAQ

What is the current 1-month volatility of ERII?
As of today, ERII 1-month volatility is 29.38%
What 1-month volatility category does ERII fall into?
Based on its current 1-month historical volatility, ERII falls into the moderate volatility category
What is ERII 1-month volatility 1-year high?
ERII 1-month volatility reached a 1-year high of 85.35% on May 17, 2025
What is ERII 1-month volatility 1-year low?
ERII 1-month volatility reached a 1-year low of 18.94% on June 22, 2025

3-Month

45.38%

January 13, 2026

Summary

Current Value: As of today, ERII 3-month volatility is 45.38%, down -0.33% on January 13, 2026
Value Category: Based on its current 3-month historical volatility, ERII falls into the high volatility category
1-Year High: ERII 3-month volatility reached a 1-year high of 57.87% on May 18, 2025
1-Year Low: ERII 3-month volatility reached a 1-year low of 29.91% on February 19, 2025

Performance

ERII Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
3-Month Volatility	Jan 13, 26	45.38%	-0.3%	+2.8%	+48.5%	+3.8%	-18.5%	-34.9%	+10.1%
10-Day Volatility	Jan 13, 26	35.54%	-0.9%	+40.9%	+74.6%	+55.8%	+13.8%	+11.2%	-30.4%
1-Month Volatility	Jan 13, 26	29.38%	-2.3%	-8.1%	+27.0%	+24.6%	-6.3%	-11.5%	-30.3%
1-Year Volatility	Jan 13, 26	41.22%	0.0%	-0.8%	-6.9%	-0.0%	-20.9%	-11.6%	-29.1%
14-Day RSI	Jan 13, 26	52.53	+3.2%	+13.3%	-12.1%	+52.0%	+60.6%	-12.0%	-11.6%
Beta	Jan 13, 26	0.87	0.0%	-3.3%	+2.4%	-2.3%	-3.3%	-23.7%	-17.9%
ATR	Jan 13, 26	$0.38	-2.8%	-17.2%	-1.3%	+6.1%	-32.6%	-42.4%	-32.4%
Price	Jan 13, 26	$14.38	+0.7%	-0.6%	-7.6%	+6.6%	+2.3%	-35.2%	+1.8%
200-Day SMA	Jan 13, 26	$14.29	-0.1%	-1.4%	-0.4%	-0.6%	-8.0%	-32.8%	+57.1%
50-Day SMA	Jan 13, 26	$14.43	-0.4%	-6.4%	-1.9%	-3.5%	-12.1%	-32.3%	+20.2%

3-Month Volatility History

Date	Value	Change
Jan 13, 2026	45.38%	+3.7%
Dec 31, 2025	43.75%	-21.7%
Dec 31, 2024	55.91%	-18.3%
Dec 31, 2023	68.41%	-1.9%
Dec 31, 2022	69.73%	+142.5%
Dec 31, 2021	28.75%	-24.5%
Dec 31, 2020	38.09%	+55.5%
Dec 31, 2019	24.49%	-56.3%
Dec 31, 2018	55.98%	-4.7%
Dec 31, 2017	58.74%	-11.2%

Date	Value	Change
Dec 31, 2016	66.18%	-83.3%
Dec 31, 2015	397.28%	+523.4%
Dec 31, 2014	63.73%	+16.6%
Dec 31, 2013	54.65%	-4.6%
Dec 31, 2012	57.26%	-32.5%
Dec 31, 2011	84.83%	+84.9%
Dec 31, 2010	45.89%	+3.9%
Dec 31, 2009	44.18%	-61.5%
Dec 31, 2008	114.67%	-

FAQ

What is the current 3-month volatility of ERII?
As of today, ERII 3-month volatility is 45.38%
What 3-month volatility category does ERII fall into?
Based on its current 3-month historical volatility, ERII falls into the high volatility category
What is ERII 3-month volatility 1-year high?
ERII 3-month volatility reached a 1-year high of 57.87% on May 18, 2025
What is ERII 3-month volatility 1-year low?
ERII 3-month volatility reached a 1-year low of 29.91% on February 19, 2025

1-Year

41.22%

January 13, 2026

Summary

Current Value: As of today, ERII 1-year volatility is 41.22%, unchanged on January 13, 2026
Value Category: Based on its current 1-year historical volatility, ERII falls into the high volatility category
1-Year High: ERII 1-year volatility reached a 1-year high of 53.32% on May 17, 2025
1-Year Low: ERII 1-year volatility reached a 1-year low of 41.17% on December 29, 2025

Performance

ERII Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
1-Year Volatility	Jan 13, 26	41.22%	0.0%	-0.8%	-6.9%	-0.0%	-20.9%	-11.6%	-29.1%
10-Day Volatility	Jan 13, 26	35.54%	-0.9%	+40.9%	+74.6%	+55.8%	+13.8%	+11.2%	-30.4%
1-Month Volatility	Jan 13, 26	29.38%	-2.3%	-8.1%	+27.0%	+24.6%	-6.3%	-11.5%	-30.3%
3-Month Volatility	Jan 13, 26	45.38%	-0.3%	+2.8%	+48.5%	+3.8%	-18.5%	-34.9%	+10.1%
1-Year Volatility	Jan 13, 26	41.22%	0.0%	-0.8%	-6.9%	-0.0%	-20.9%	-11.6%	-29.1%
14-Day RSI	Jan 13, 26	52.53	+3.2%	+13.3%	-12.1%	+52.0%	+60.6%	-12.0%	-11.6%
Beta	Jan 13, 26	0.87	0.0%	-3.3%	+2.4%	-2.3%	-3.3%	-23.7%	-17.9%
ATR	Jan 13, 26	$0.38	-2.8%	-17.2%	-1.3%	+6.1%	-32.6%	-42.4%	-32.4%
Price	Jan 13, 26	$14.38	+0.7%	-0.6%	-7.6%	+6.6%	+2.3%	-35.2%	+1.8%
200-Day SMA	Jan 13, 26	$14.29	-0.1%	-1.4%	-0.4%	-0.6%	-8.0%	-32.8%	+57.1%
50-Day SMA	Jan 13, 26	$14.43	-0.4%	-6.4%	-1.9%	-3.5%	-12.1%	-32.3%	+20.2%

1-Year Volatility History

Date	Value	Change
Jan 13, 2026	41.22%	-0.0%
Dec 31, 2025	41.23%	-20.8%
Dec 31, 2024	52.09%	+10.7%
Dec 31, 2023	47.06%	+0.7%
Dec 31, 2022	46.74%	+6.3%
Dec 31, 2021	43.95%	-23.5%
Dec 31, 2020	57.43%	+40.1%
Dec 31, 2019	41.00%	-15.9%
Dec 31, 2018	48.78%	-0.0%
Dec 31, 2017	48.79%	-23.3%

Date	Value	Change
Dec 31, 2016	63.64%	-69.3%
Dec 31, 2015	206.97%	+209.3%
Dec 31, 2014	66.91%	+5.0%
Dec 31, 2013	63.72%	+22.9%
Dec 31, 2012	51.85%	-28.2%
Dec 31, 2011	72.17%	+28.6%
Dec 31, 2010	56.13%	-7.1%
Dec 31, 2009	60.40%	-35.8%
Dec 31, 2008	94.11%	-

FAQ

What is the current 1-year volatility of ERII?
As of today, ERII 1-year volatility is 41.22%
What 1-year volatility category does ERII fall into?
Based on its current 1-year historical volatility, ERII falls into the high volatility category
What is ERII 1-year volatility 1-year high?
ERII 1-year volatility reached a 1-year high of 53.32% on May 17, 2025
What is ERII 1-year volatility 1-year low?
ERII 1-year volatility reached a 1-year low of 41.17% on December 29, 2025

Data Sources & References

ERII Official Website www.energyrecovery.com
Most Recent Quarterly Report (10-Q) www.sec.gov/Archives/edgar/data/1421517/000142151725000134/0001421517-25-000134-index.htm
Most Recent Annual Report (10-K) www.sec.gov/Archives/edgar/data/1421517/000142151725000048/0001421517-25-000048-index.htm
ERII Profile on Yahoo Finance finance.yahoo.com/quote/ERII
ERII Profile on NASDAQ.com www.nasdaq.com/market-activity/stocks/erii