What is the current 10-day volatility of ATO?

As of today, ATO 10-day volatility is 11.94%

What 10-day volatility category does ATO fall into?

Based on its current 10-day historical volatility, ATO falls into the very low volatility category

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

ATO 10-day volatility reached a 1-year high of 26.41% on July 16, 2026

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

ATO 10-day volatility reached a 1-year low of 7.72% on June 29, 2026

What is the current 1-month volatility of ATO?

As of today, ATO 1-month volatility is 13.70%

What 1-month volatility category does ATO fall into?

Based on its current 1-month historical volatility, ATO falls into the very low volatility category

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

ATO 1-month volatility reached a 1-year high of 21.85% on July 31, 2026

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

ATO 1-month volatility reached a 1-year low of 9.70% on January 16, 2026

What is the current 3-month volatility of ATO?

As of today, ATO 3-month volatility is 15.85%

What 3-month volatility category does ATO fall into?

Based on its current 3-month historical volatility, ATO falls into the low volatility category

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

ATO 3-month volatility reached a 1-year high of 18.99% on July 22, 2026

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

ATO 3-month volatility reached a 1-year low of 13.20% on March 19, 2026

What is the current 1-year volatility of ATO?

As of today, ATO 1-year volatility is 15.61%

What 1-year volatility category does ATO fall into?

Based on its current 1-year historical volatility, ATO falls into the low volatility category

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

ATO 1-year volatility reached a 1-year high of 17.61% on November 6, 2025

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

ATO 1-year volatility reached a 1-year low of 15.09% on April 22, 2026

ATO Stock Volatility History & Chart Since 1983

10-Day

11.94%

September 11, 2026

Summary

Current Value: As of today, ATO 10-day volatility is 11.94%, down -5.46% on September 11, 2026
Value Category: Based on its current 10-day historical volatility, ATO falls into the very low volatility category
1-Year High: ATO 10-day volatility reached a 1-year high of 26.41% on July 16, 2026
1-Year Low: ATO 10-day volatility reached a 1-year low of 7.72% on June 29, 2026

10-Day Volatility Chart

Performance

ATO Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
10-Day Volatility	Sep 11, 26	11.94%	-5.5%	+22.8%	-22.8%	+13.4%	-9.5%	-40.4%	-43.5%
1-Month Volatility	Sep 11, 26	13.70%	+6.4%	-12.8%	-24.6%	-5.4%	+7.1%	-11.5%	-16.9%
3-Month Volatility	Sep 11, 26	15.85%	+0.3%	-8.0%	-8.1%	+7.2%	+2.3%	+3.4%	-6.1%
1-Year Volatility	Sep 11, 26	15.61%	-0.1%	+0.6%	+0.5%	-9.4%	-9.3%	-30.6%	-29.6%
14-Day RSI	Sep 11, 26	32.76	-9.4%	-17.9%	-40.9%	-23.1%	-46.2%	-36.7%	+27.3%
Beta	Sep 11, 26	-0.16	-6.7%	-6.7%	-700.0%	-214.3%	-176.2%	-123.9%	-139.0%
ATR	Sep 11, 26	$2.60	+0.7%	-11.6%	-16.0%	+16.0%	+15.1%	+42.7%	+62.8%
Price	Sep 11, 26	$163.19	-1.0%	-4.0%	-4.0%	-2.6%	-2.0%	+40.3%	+78.8%
200-Day SMA	Sep 11, 26	$175.39	-0.0%	-0.4%	+0.1%	+7.8%	+15.2%	+51.5%	+81.7%
50-Day SMA	Sep 11, 26	$172.21	-0.1%	-0.6%	-4.6%	-0.1%	+7.1%	+46.0%	+74.6%
20-Day SMA	Sep 11, 26	$167.93	-0.2%	-3.4%	-2.5%	-0.3%	+1.4%	+45.2%	+73.1%

10-Day Volatility History

Date	Value	Change
Sep 14, 2026	11.94%	+13.4%
Dec 31, 2025	10.53%	-51.0%
Dec 31, 2024	21.50%	+66.2%
Dec 31, 2023	12.94%	-25.9%
Dec 31, 2022	17.46%	-5.4%
Dec 31, 2021	18.45%	-37.4%
Dec 31, 2020	29.49%	+125.8%
Dec 31, 2019	13.06%	-61.2%
Dec 31, 2018	33.69%	+132.8%
Dec 31, 2017	14.47%	+4.3%
Dec 31, 2016	13.88%	-15.3%
Dec 31, 2015	16.38%	-41.7%
Dec 31, 2014	28.11%	+77.1%
Dec 31, 2013	15.87%	-17.0%
Dec 31, 2012	19.12%	+12.9%
Dec 31, 2011	16.93%	+178.5%
Dec 31, 2010	6.08%	-45.4%
Dec 31, 2009	11.14%	-40.2%
Dec 31, 2008	18.63%	-5.7%
Dec 31, 2007	19.75%	+40.1%
Dec 31, 2006	14.10%	+0.4%
Dec 31, 2005	14.04%	+8.8%

Date	Value	Change
Dec 31, 2004	12.91%	-32.6%
Dec 31, 2003	19.15%	+12.0%
Dec 31, 2002	17.10%	-7.8%
Dec 31, 2001	18.55%	-68.3%
Dec 31, 2000	58.52%	+105.7%
Dec 31, 1999	28.45%	+130.0%
Dec 31, 1998	12.37%	-55.6%
Dec 31, 1997	27.89%	+167.9%
Dec 31, 1996	10.41%	+11.1%
Dec 31, 1995	9.37%	-69.0%
Dec 31, 1994	30.21%	+7.6%
Dec 31, 1993	28.08%	+67.6%
Dec 31, 1992	16.75%	-51.9%
Dec 31, 1991	34.81%	+7.2%
Dec 31, 1990	32.46%	+123.2%
Dec 31, 1989	14.54%	-1.2%
Dec 31, 1988	14.72%	-50.1%
Dec 31, 1987	29.51%	+91.1%
Dec 31, 1986	15.44%	-11.1%
Dec 31, 1985	17.37%	-30.6%
Dec 31, 1984	25.02%	+197.1%
Dec 31, 1983	8.42%	-

FAQ

What is the current 10-day volatility of ATO?: As of today, ATO 10-day volatility is 11.94%
What 10-day volatility category does ATO fall into?: Based on its current 10-day historical volatility, ATO falls into the very low volatility category
What is ATO 10-day volatility 1-year high?: ATO 10-day volatility reached a 1-year high of 26.41% on July 16, 2026
What is ATO 10-day volatility 1-year low?: ATO 10-day volatility reached a 1-year low of 7.72% on June 29, 2026

1-Month

13.70%

September 11, 2026

Summary

Current Value: As of today, ATO 1-month volatility is 13.70%, up +6.37% on September 11, 2026
Value Category: Based on its current 1-month historical volatility, ATO falls into the very low volatility category
1-Year High: ATO 1-month volatility reached a 1-year high of 21.85% on July 31, 2026
1-Year Low: ATO 1-month volatility reached a 1-year low of 9.70% on January 16, 2026

Performance

ATO Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
1-Month Volatility	Sep 11, 26	13.70%	+6.4%	-12.8%	-24.6%	-5.4%	+7.1%	-11.5%	-16.9%
10-Day Volatility	Sep 11, 26	11.94%	-5.5%	+22.8%	-22.8%	+13.4%	-9.5%	-40.4%	-43.5%
3-Month Volatility	Sep 11, 26	15.85%	+0.3%	-8.0%	-8.1%	+7.2%	+2.3%	+3.4%	-6.1%
1-Year Volatility	Sep 11, 26	15.61%	-0.1%	+0.6%	+0.5%	-9.4%	-9.3%	-30.6%	-29.6%
14-Day RSI	Sep 11, 26	32.76	-9.4%	-17.9%	-40.9%	-23.1%	-46.2%	-36.7%	+27.3%
Beta	Sep 11, 26	-0.16	-6.7%	-6.7%	-700.0%	-214.3%	-176.2%	-123.9%	-139.0%
ATR	Sep 11, 26	$2.60	+0.7%	-11.6%	-16.0%	+16.0%	+15.1%	+42.7%	+62.8%
Price	Sep 11, 26	$163.19	-1.0%	-4.0%	-4.0%	-2.6%	-2.0%	+40.3%	+78.8%
200-Day SMA	Sep 11, 26	$175.39	-0.0%	-0.4%	+0.1%	+7.8%	+15.2%	+51.5%	+81.7%
50-Day SMA	Sep 11, 26	$172.21	-0.1%	-0.6%	-4.6%	-0.1%	+7.1%	+46.0%	+74.6%
20-Day SMA	Sep 11, 26	$167.93	-0.2%	-3.4%	-2.5%	-0.3%	+1.4%	+45.2%	+73.1%

1-Month Volatility History

Date	Value	Change
Sep 14, 2026	13.70%	-17.1%
Dec 31, 2025	16.52%	-4.3%
Dec 31, 2024	17.26%	+10.7%
Dec 31, 2023	15.59%	-4.8%
Dec 31, 2022	16.37%	-6.5%
Dec 31, 2021	17.51%	-25.0%
Dec 31, 2020	23.36%	+87.6%
Dec 31, 2019	12.45%	-53.3%
Dec 31, 2018	26.65%	+81.9%
Dec 31, 2017	14.65%	-12.2%
Dec 31, 2016	16.69%	-13.0%
Dec 31, 2015	19.18%	-20.8%
Dec 31, 2014	24.22%	+46.3%
Dec 31, 2013	16.56%	+10.2%
Dec 31, 2012	15.03%	-40.3%
Dec 31, 2011	25.16%	+67.5%
Dec 31, 2010	15.02%	+12.8%
Dec 31, 2009	13.31%	-67.8%
Dec 31, 2008	41.30%	+119.8%
Dec 31, 2007	18.79%	+41.6%
Dec 31, 2006	13.27%	+22.4%
Dec 31, 2005	10.84%	+3.8%

Date	Value	Change
Dec 31, 2004	10.44%	-33.7%
Dec 31, 2003	15.75%	-17.8%
Dec 31, 2002	19.16%	+7.9%
Dec 31, 2001	17.76%	-67.6%
Dec 31, 2000	54.79%	+116.0%
Dec 31, 1999	25.37%	-5.3%
Dec 31, 1998	26.78%	+21.7%
Dec 31, 1997	22.01%	+6.7%
Dec 31, 1996	20.62%	+110.4%
Dec 31, 1995	9.80%	-67.8%
Dec 31, 1994	30.42%	+58.7%
Dec 31, 1993	19.17%	-13.9%
Dec 31, 1992	22.27%	-24.5%
Dec 31, 1991	29.50%	+1.6%
Dec 31, 1990	29.04%	+118.3%
Dec 31, 1989	13.30%	-35.4%
Dec 31, 1988	20.59%	-31.8%
Dec 31, 1987	30.18%	+59.2%
Dec 31, 1986	18.96%	-39.1%
Dec 31, 1985	31.11%	+41.9%
Dec 31, 1984	21.92%	+160.3%
Dec 31, 1983	8.42%	-

FAQ

What is the current 1-month volatility of ATO?: As of today, ATO 1-month volatility is 13.70%
What 1-month volatility category does ATO fall into?: Based on its current 1-month historical volatility, ATO falls into the very low volatility category
What is ATO 1-month volatility 1-year high?: ATO 1-month volatility reached a 1-year high of 21.85% on July 31, 2026
What is ATO 1-month volatility 1-year low?: ATO 1-month volatility reached a 1-year low of 9.70% on January 16, 2026

3-Month

15.85%

September 11, 2026

Summary

Current Value: As of today, ATO 3-month volatility is 15.85%, up +0.32% on September 11, 2026
Value Category: Based on its current 3-month historical volatility, ATO falls into the low volatility category
1-Year High: ATO 3-month volatility reached a 1-year high of 18.99% on July 22, 2026
1-Year Low: ATO 3-month volatility reached a 1-year low of 13.20% on March 19, 2026

Performance

ATO Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
3-Month Volatility	Sep 11, 26	15.85%	+0.3%	-8.0%	-8.1%	+7.2%	+2.3%	+3.4%	-6.1%
10-Day Volatility	Sep 11, 26	11.94%	-5.5%	+22.8%	-22.8%	+13.4%	-9.5%	-40.4%	-43.5%
1-Month Volatility	Sep 11, 26	13.70%	+6.4%	-12.8%	-24.6%	-5.4%	+7.1%	-11.5%	-16.9%
1-Year Volatility	Sep 11, 26	15.61%	-0.1%	+0.6%	+0.5%	-9.4%	-9.3%	-30.6%	-29.6%
14-Day RSI	Sep 11, 26	32.76	-9.4%	-17.9%	-40.9%	-23.1%	-46.2%	-36.7%	+27.3%
Beta	Sep 11, 26	-0.16	-6.7%	-6.7%	-700.0%	-214.3%	-176.2%	-123.9%	-139.0%
ATR	Sep 11, 26	$2.60	+0.7%	-11.6%	-16.0%	+16.0%	+15.1%	+42.7%	+62.8%
Price	Sep 11, 26	$163.19	-1.0%	-4.0%	-4.0%	-2.6%	-2.0%	+40.3%	+78.8%
200-Day SMA	Sep 11, 26	$175.39	-0.0%	-0.4%	+0.1%	+7.8%	+15.2%	+51.5%	+81.7%
50-Day SMA	Sep 11, 26	$172.21	-0.1%	-0.6%	-4.6%	-0.1%	+7.1%	+46.0%	+74.6%
20-Day SMA	Sep 11, 26	$167.93	-0.2%	-3.4%	-2.5%	-0.3%	+1.4%	+45.2%	+73.1%

3-Month Volatility History

Date	Value	Change
Sep 14, 2026	15.85%	+7.5%
Dec 31, 2025	14.75%	-3.6%
Dec 31, 2024	15.30%	-14.8%
Dec 31, 2023	17.96%	-37.8%
Dec 31, 2022	28.88%	+37.6%
Dec 31, 2021	20.99%	-27.6%
Dec 31, 2020	28.99%	+127.4%
Dec 31, 2019	12.75%	-46.0%
Dec 31, 2018	23.63%	+92.0%
Dec 31, 2017	12.31%	-44.1%
Dec 31, 2016	22.03%	+10.4%
Dec 31, 2015	19.95%	+7.5%
Dec 31, 2014	18.56%	+15.4%
Dec 31, 2013	16.09%	-3.4%
Dec 31, 2012	16.65%	-40.9%
Dec 31, 2011	28.15%	+131.5%
Dec 31, 2010	12.16%	-37.1%
Dec 31, 2009	19.33%	-66.4%
Dec 31, 2008	57.52%	+243.8%
Dec 31, 2007	16.73%	+23.8%
Dec 31, 2006	13.51%	-10.1%
Dec 31, 2005	15.03%	+4.1%

Date	Value	Change
Dec 31, 2004	14.44%	+9.6%
Dec 31, 2003	13.18%	-48.6%
Dec 31, 2002	25.63%	+9.6%
Dec 31, 2001	23.38%	-36.3%
Dec 31, 2000	36.70%	+68.7%
Dec 31, 1999	21.75%	-16.0%
Dec 31, 1998	25.90%	+1.2%
Dec 31, 1997	25.60%	+10.0%
Dec 31, 1996	23.27%	+32.0%
Dec 31, 1995	17.63%	-38.5%
Dec 31, 1994	28.67%	+63.5%
Dec 31, 1993	17.53%	-17.7%
Dec 31, 1992	21.30%	-17.7%
Dec 31, 1991	25.87%	+0.3%
Dec 31, 1990	25.79%	+72.9%
Dec 31, 1989	14.92%	-18.2%
Dec 31, 1988	18.24%	-65.5%
Dec 31, 1987	52.91%	+181.6%
Dec 31, 1986	18.79%	-34.6%
Dec 31, 1985	28.72%	+12.2%
Dec 31, 1984	25.60%	+204.0%
Dec 31, 1983	8.42%	-

FAQ

What is the current 3-month volatility of ATO?: As of today, ATO 3-month volatility is 15.85%
What 3-month volatility category does ATO fall into?: Based on its current 3-month historical volatility, ATO falls into the low volatility category
What is ATO 3-month volatility 1-year high?: ATO 3-month volatility reached a 1-year high of 18.99% on July 22, 2026
What is ATO 3-month volatility 1-year low?: ATO 3-month volatility reached a 1-year low of 13.20% on March 19, 2026

1-Year

15.61%

September 11, 2026

Summary

Current Value: As of today, ATO 1-year volatility is 15.61%, down -0.06% on September 11, 2026
Value Category: Based on its current 1-year historical volatility, ATO falls into the low volatility category
1-Year High: ATO 1-year volatility reached a 1-year high of 17.61% on November 6, 2025
1-Year Low: ATO 1-year volatility reached a 1-year low of 15.09% on April 22, 2026

Performance

ATO Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
1-Year Volatility	Sep 11, 26	15.61%	-0.1%	+0.6%	+0.5%	-9.4%	-9.3%	-30.6%	-29.6%
10-Day Volatility	Sep 11, 26	11.94%	-5.5%	+22.8%	-22.8%	+13.4%	-9.5%	-40.4%	-43.5%
1-Month Volatility	Sep 11, 26	13.70%	+6.4%	-12.8%	-24.6%	-5.4%	+7.1%	-11.5%	-16.9%
3-Month Volatility	Sep 11, 26	15.85%	+0.3%	-8.0%	-8.1%	+7.2%	+2.3%	+3.4%	-6.1%
1-Year Volatility	Sep 11, 26	15.61%	-0.1%	+0.6%	+0.5%	-9.4%	-9.3%	-30.6%	-29.6%
14-Day RSI	Sep 11, 26	32.76	-9.4%	-17.9%	-40.9%	-23.1%	-46.2%	-36.7%	+27.3%
Beta	Sep 11, 26	-0.16	-6.7%	-6.7%	-700.0%	-214.3%	-176.2%	-123.9%	-139.0%
ATR	Sep 11, 26	$2.60	+0.7%	-11.6%	-16.0%	+16.0%	+15.1%	+42.7%	+62.8%
Price	Sep 11, 26	$163.19	-1.0%	-4.0%	-4.0%	-2.6%	-2.0%	+40.3%	+78.8%
200-Day SMA	Sep 11, 26	$175.39	-0.0%	-0.4%	+0.1%	+7.8%	+15.2%	+51.5%	+81.7%
50-Day SMA	Sep 11, 26	$172.21	-0.1%	-0.6%	-4.6%	-0.1%	+7.1%	+46.0%	+74.6%
20-Day SMA	Sep 11, 26	$167.93	-0.2%	-3.4%	-2.5%	-0.3%	+1.4%	+45.2%	+73.1%

1-Year Volatility History

Date	Value	Change
Sep 14, 2026	15.61%	-9.4%
Dec 31, 2025	17.23%	+14.6%
Dec 31, 2024	15.04%	-19.8%
Dec 31, 2023	18.76%	-19.4%
Dec 31, 2022	23.28%	+17.1%
Dec 31, 2021	19.88%	-52.2%
Dec 31, 2020	41.62%	+195.0%
Dec 31, 2019	14.11%	-19.0%
Dec 31, 2018	17.43%	+44.2%
Dec 31, 2017	12.09%	-35.3%
Dec 31, 2016	18.68%	-2.3%
Dec 31, 2015	19.11%	+17.2%
Dec 31, 2014	16.31%	+2.5%
Dec 31, 2013	15.91%	+10.6%
Dec 31, 2012	14.39%	-43.5%
Dec 31, 2011	25.47%	+48.1%
Dec 31, 2010	17.20%	-24.1%
Dec 31, 2009	22.66%	-34.9%
Dec 31, 2008	34.80%	+103.4%
Dec 31, 2007	17.11%	+35.4%
Dec 31, 2006	12.64%	-20.5%
Dec 31, 2005	15.89%	+6.5%

Date	Value	Change
Dec 31, 2004	14.92%	-12.7%
Dec 31, 2003	17.09%	-37.0%
Dec 31, 2002	27.12%	-4.9%
Dec 31, 2001	28.53%	-31.1%
Dec 31, 2000	41.39%	+66.4%
Dec 31, 1999	24.87%	-5.2%
Dec 31, 1998	26.23%	+15.5%
Dec 31, 1997	22.71%	-18.7%
Dec 31, 1996	27.95%	+46.4%
Dec 31, 1995	19.09%	-25.3%
Dec 31, 1994	25.54%	+38.0%
Dec 31, 1993	18.51%	-10.2%
Dec 31, 1992	20.62%	-5.8%
Dec 31, 1991	21.90%	+0.5%
Dec 31, 1990	21.80%	+34.6%
Dec 31, 1989	16.20%	-32.0%
Dec 31, 1988	23.81%	-27.7%
Dec 31, 1987	32.92%	+10.5%
Dec 31, 1986	29.79%	+13.3%
Dec 31, 1985	26.29%	+18.7%
Dec 31, 1984	22.14%	+162.9%
Dec 31, 1983	8.42%	-

FAQ

What is the current 1-year volatility of ATO?: As of today, ATO 1-year volatility is 15.61%
What 1-year volatility category does ATO fall into?: Based on its current 1-year historical volatility, ATO falls into the low volatility category
What is ATO 1-year volatility 1-year high?: ATO 1-year volatility reached a 1-year high of 17.61% on November 6, 2025
What is ATO 1-year volatility 1-year low?: ATO 1-year volatility reached a 1-year low of 15.09% on April 22, 2026

Data Sources & References

ATO Official Website www.atmosenergy.com
Most Recent Annual Report (10-K) www.sec.gov/Archives/edgar/data/731802/000073180225000056/0000731802-25-000056-index.htm
ATO Profile on Yahoo Finance finance.yahoo.com/quote/ATO
ATO Profile on NASDAQ.com www.nasdaq.com/market-activity/stocks/ato