What is the current annual book value of ATO?

As of today, ATO annual book value is $13.56B

What is 1-year change in ATO annual book value?

ATO annual book value is up +11.53% year-over-year

What is 3-year change in ATO annual book value?

ATO annual book value is up +43.95% over the past 3 years

How far is ATO annual book value from its all-time high?

ATO annual book value is currently at its all-time high

How does ATO annual book value rank versus sector peers?

ATO annual book value is higher than 81.25% of companies in Utilities sector

When is ATO next annual earnings release?

The next annual earnings release for ATO is on November 4, 2026

What is the current quarterly book value of ATO?

As of today, ATO quarterly book value is $15.26B

What is ATO quarterly book value most recent change?

ATO quarterly book value was up +2.34% on June 30, 2026

What is 1-year change in ATO quarterly book value?

ATO quarterly book value is up +13.99% year-over-year

How far is ATO quarterly book value from its all-time high?

ATO quarterly book value is currently at its all-time high

How does ATO quarterly book value rank versus sector peers?

ATO quarterly book value is higher than 82.88% of companies in Utilities sector

When is ATO next earnings release?

The next earnings release for ATO is on November 4, 2026

ATO Book Value History & Chart Since 1986

Annual Book Value

$13.56B$1.40B+11.53%

September 30, 2025

Summary

Current Value: As of today, ATO annual book value is $13.56B, up +11.53% on September 30, 2025
Historical Performance: ATO annual book value is up +43.95% over the past 3 years, up +99.65% over the past 5 years
All-Time High Comparison: ATO annual book value is currently at its all-time high
3-Year Low Comparison: ATO annual book value is +24.74% above its 3-year low of $10.87B reached on an earlier date
Sector Comparison: ATO annual book value is higher than 81.25% of companies in Utilities sector

Book Value Chart

beforeafter

Performance

ATO Performance
Metric	Date	Value	1Y	3Y	5Y	15Y
Annual Book Value	Sep 30, 25	$13.56B	+11.5%	+44.0%	+99.7%	+522.4%
Quarterly Book Value	Jun 30, 26	$15.26B	+14.0%	+43.9%	+96.3%	+553.2%
Price	Sep 30, 26	$156.44	-7.6%	+47.7%	+76.2%	+382.1%
	Sep 30, 25	$28.91B	+11.7%	+26.0%	+78.8%	+327.4%
	Sep 30, 25	$15.35B	+11.9%	+13.5%	+63.8%	+234.7%
	Sep 30, 26	1.73	-14.4%	+19.3%	+16.1%	+33.1%
	Sep 30, 25	$13.56B	+11.5%	+44.0%	+99.7%	+522.4%
Market Cap	Sep 30, 26	$26B	-3.4%	+68.1%	+124.9%	+802.2%

Book Value Highs

ATO Annual Book Value Highs Comparison
Period	High	Date	Current
3Y	$13.56B	Sep 30, 25	at high
5Y	$13.56B	Sep 30, 25	at high
All	$13.56B	Sep 30, 25	at high

Book Value Lows

ATO Annual Book Value Lows Comparison
Period	Low	Date	Current
3Y	$10.87B	N/A	+24.7%
5Y	$7.91B	N/A	+71.5%
All	$40.99M	Sep 30, 86	>+9999.0%

Book Value History

Year	Value	Change
2025	$13.56B	+11.5%
2024	$12.16B	+11.8%
2023	$10.87B	+15.4%
2022	$9.42B	+19.1%
2021	$7.91B	+16.4%
2020	$6.79B	+18.1%
2019	$5.75B	+20.6%
2018	$4.77B	+22.3%
2017	$3.90B	+12.6%
2016	$3.46B	+8.4%
2015	$3.19B	+3.5%
2014	$3.09B	+19.6%
2013	$2.58B	+9.4%
2012	$2.36B	+4.6%
2011	$2.26B	+3.5%
2010	$2.18B	+0.1%
2009	$2.18B	+6.1%
2008	$2.05B	+4.4%
2007	$1.97B	+19.3%
2006	$1.65B	+2.9%

Year	Value	Change
2005	$1.60B	+41.4%
2004	$1.13B	+32.2%
2003	$857.52M	+49.6%
2002	$573.23M	-1.8%
2001	$583.86M	+48.8%
2000	$392.47M	+3.9%
1999	$377.66M	+1.8%
1998	$371.16M	+13.4%
1997	$327.26M	+89.9%
1996	$172.30M	+8.9%
1995	$158.28M	+5.8%
1994	$149.56M	+26.5%
1993	$118.23M	+23.1%
1992	$96.03M	+6.3%
1991	$90.31M	+13.2%
1990	$79.75M	+2.6%
1989	$77.73M	+1.9%
1988	$76.31M	+79.0%
1987	$42.64M	+4.0%
1986	$40.99M	-

FAQ

What is the current annual book value of ATO?: As of today, ATO annual book value is $13.56B
What is 1-year change in ATO annual book value?: ATO annual book value is up +11.53% year-over-year
What is 3-year change in ATO annual book value?: ATO annual book value is up +43.95% over the past 3 years
How far is ATO annual book value from its all-time high?: ATO annual book value is currently at its all-time high
How does ATO annual book value rank versus sector peers?: ATO annual book value is higher than 81.25% of companies in Utilities sector
When is ATO next annual earnings release?: The next annual earnings release for ATO is on November 4, 2026

Book Value Formula

Book Value = −

Quarterly Book Value

$15.26B$349.41M+2.34%

June 30, 2026

Summary

Current Value: As of today, ATO quarterly book value is $15.26B, up +2.34% on June 30, 2026
Historical Performance: ATO quarterly book value is up +13.99% year-over-year, up +43.91% over the past 3 years
All-Time High Comparison: ATO quarterly book value is currently at its all-time high
3-Year Low Comparison: ATO quarterly book value is +40.37% above its 3-year low of $10.87B reached on an earlier date
Sector Comparison: ATO quarterly book value is higher than 82.88% of companies in Utilities sector

Performance

ATO Performance
Metric	Date	Value	3M	1Y	3Y	5Y
Quarterly Book Value	Jun 30, 26	$15.26B	+2.3%	+14.0%	+43.9%	+96.3%
Annual Book Value	Sep 30, 25	$13.56B	–	+11.5%	+44.0%	+99.7%
Price	Sep 30, 26	$156.44	-9.6%	-7.6%	+47.7%	+76.2%
	Jun 30, 26	$31.59B	+4.0%	+14.0%	+45.1%	+63.5%
	Jun 30, 26	$16.33B	+5.5%	+14.0%	+46.2%	+41.5%
	Sep 30, 26	1.73	-8.5%	-14.4%	+19.3%	+16.1%
	Jun 30, 26	$15.26B	+2.3%	+14.0%	+43.9%	+96.3%
Market Cap	Sep 30, 26	$26B	-8.5%	-3.4%	+68.1%	+124.9%

Quarterly Book Value Highs

ATO Quarterly Book Value Highs Comparison
Period	High	Date	Current
1Y	$15.26B	Jun 30, 26	at high
3Y	$15.26B	Jun 30, 26	at high
5Y	$15.26B	Jun 30, 26	at high
All	$15.26B	Jun 30, 26	at high

Quarterly Book Value Lows

ATO Quarterly Book Value Lows Comparison
Period	Low	Date	Current
1Y	$13.56B	N/A	+12.5%
3Y	$10.87B	N/A	+40.4%
5Y	$7.91B	N/A	+93.0%
All	$149.60M	Sep 30, 94	>+9999.0%

Quarterly Book Value History

Month	Value	Change
Jun 2026	$15.26B	+2.3%
Mar 2026	$14.91B	+4.4%
Dec 2025	$14.28B	+5.3%
Sep 2025	$13.56B	+1.3%
Jun 2025	$13.39B	+1.9%
Mar 2025	$13.14B	+2.8%
Dec 2024	$12.78B	+5.1%
Sep 2024	$12.16B	-0.2%
Jun 2024	$12.18B	+4.9%
Mar 2024	$11.62B	+3.1%
Dec 2023	$11.27B	+3.7%
Sep 2023	$10.87B	+2.5%
Jun 2023	$10.60B	+3.9%
Mar 2023	$10.21B	+3.8%
Dec 2022	$9.84B	+4.4%
Sep 2022	$9.42B	+1.6%
Jun 2022	$9.27B	+3.2%
Mar 2022	$8.98B	+8.4%
Dec 2021	$8.29B	+4.8%
Sep 2021	$7.91B	+1.7%
Jun 2021	$7.77B	-0.6%
Mar 2021	$7.82B	+8.4%
Dec 2020	$7.21B	+6.2%
Sep 2020	$6.79B	+5.1%
Jun 2020	$6.46B	+2.5%
Mar 2020	$6.30B	+2.9%
Dec 2019	$6.13B	+6.6%
Sep 2019	$5.75B	+1.9%
Jun 2019	$5.64B	+2.4%
Mar 2019	$5.51B	+3.0%
Dec 2018	$5.35B	+12.1%
Sep 2018	$4.77B	+0.2%
Jun 2018	$4.76B	+0.8%
Mar 2018	$4.72B	+3.5%
Dec 2017	$4.56B	+17.1%
Sep 2017	$3.90B	-0.1%
Jun 2017	$3.90B	+1.7%
Mar 2017	$3.83B	+3.7%
Dec 2016	$3.70B	+6.8%
Sep 2016	$3.46B	-0.1%
Jun 2016	$3.47B	+3.7%
Mar 2016	$3.34B	+2.2%
Dec 2015	$3.27B	+2.4%
Sep 2015	$3.19B	-1.3%
Jun 2015	$3.24B	+3.1%
Mar 2015	$3.14B	+2.5%
Dec 2014	$3.06B	-0.7%
Sep 2014	$3.09B	-1.0%
Jun 2014	$3.12B	-0.3%
Mar 2014	$3.12B	+17.4%
Dec 2013	$2.66B	+3.1%
Sep 2013	$2.58B	-0.0%
Jun 2013	$2.58B	+1.5%
Mar 2013	$2.54B	+4.9%
Dec 2012	$2.42B	+2.7%
Sep 2012	$2.36B	+0.2%
Jun 2012	$2.35B	-0.2%
Mar 2012	$2.36B	+4.1%
Dec 2011	$2.27B	+0.5%
Sep 2011	$2.26B	-3.4%
Jun 2011	$2.34B	-1.6%
Mar 2011	$2.37B	+4.4%
Dec 2010	$2.27B	+4.4%
Sep 2010	$2.18B	-5.9%
Jun 2010	$2.31B	-1.1%
Mar 2010	$2.34B	+3.6%

Month	Value	Change
Dec 2009	$2.26B	+3.7%
Sep 2009	$2.18B	-0.7%
Jun 2009	$2.19B	+0.6%
Mar 2009	$2.18B	+4.8%
Dec 2008	$2.08B	+1.2%
Sep 2008	$2.05B	-2.5%
Jun 2008	$2.11B	-1.0%
Mar 2008	$2.13B	+4.6%
Dec 2007	$2.03B	+3.4%
Sep 2007	$1.97B	-1.1%
Jun 2007	$1.99B	-1.7%
Mar 2007	$2.02B	+5.3%
Dec 2006	$1.92B	+16.5%
Sep 2006	$1.65B	-1.0%
Jun 2006	$1.66B	-2.4%
Mar 2006	$1.71B	+4.2%
Dec 2005	$1.64B	+2.2%
Sep 2005	$1.60B	-0.8%
Jun 2005	$1.62B	-1.0%
Mar 2005	$1.63B	+6.1%
Dec 2004	$1.54B	+35.8%
Sep 2004	$1.13B	+22.3%
Jun 2004	$926.85M	-0.6%
Mar 2004	$932.85M	+6.1%
Dec 2003	$879.35M	+2.5%
Sep 2003	$857.52M	+3.6%
Jun 2003	$827.45M	+16.9%
Mar 2003	$707.73M	+6.1%
Dec 2002	$666.81M	+16.3%
Sep 2002	$573.23M	-8.5%
Jun 2002	$626.38M	-0.7%
Mar 2002	$630.88M	+5.6%
Dec 2001	$597.42M	+2.3%
Sep 2001	$583.86M	-2.8%
Jun 2001	$600.60M	+2.6%
Mar 2001	$585.42M	+7.1%
Dec 2000	$546.42M	+39.2%
Sep 2000	$392.47M	-2.1%
Jun 2000	$400.74M	-2.8%
Mar 2000	$412.18M	+5.8%
Dec 1999	$389.56M	+3.1%
Sep 1999	$377.66M	-5.9%
Jun 1999	$401.38M	-2.1%
Mar 1999	$409.93M	+6.5%
Dec 1998	$384.84M	+3.7%
Sep 1998	$371.16M	-1.9%
Jun 1998	$378.40M	-0.4%
Mar 1998	$380.10M	+10.2%
Dec 1997	$344.90M	+5.4%
Sep 1997	$327.30M	+73.9%
Jun 1997	$188.20M	-1.4%
Mar 1997	$190.80M	+6.3%
Dec 1996	$179.50M	-45.5%
Sep 1996	$329.60M	+84.0%
Jun 1996	$179.10M	-1.3%
Mar 1996	$181.50M	+9.3%
Dec 1995	$166.10M	+4.9%
Sep 1995	$158.30M	-2.6%
Jun 1995	$162.60M	-1.2%
Mar 1995	$164.60M	+7.4%
Dec 1994	$153.30M	+2.5%
Sep 1994	$149.60M	-4.3%
Jun 1994	$156.40M	-2.6%
Mar 1994	$160.50M	+6.5%
Dec 1993	$150.70M	-

FAQ

What is the current quarterly book value of ATO?: As of today, ATO quarterly book value is $15.26B
What is ATO quarterly book value most recent change?: ATO quarterly book value was up +2.34% on June 30, 2026
What is 1-year change in ATO quarterly book value?: ATO quarterly book value is up +13.99% year-over-year
How far is ATO quarterly book value from its all-time high?: ATO quarterly book value is currently at its all-time high
How does ATO quarterly book value rank versus sector peers?: ATO quarterly book value is higher than 82.88% of companies in Utilities sector
When is ATO next earnings release?: The next earnings release for ATO is on November 4, 2026

Book Value Formula

Book Value = −

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