What is the current 10-day volatility of AMT?

As of today, AMT 10-day volatility is 19.12%

What 10-day volatility category does AMT fall into?

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

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

AMT 10-day volatility reached a 1-year high of 44.33% on July 7, 2026

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

AMT 10-day volatility reached a 1-year low of 9.95% on January 6, 2026

What is the current 1-month volatility of AMT?

As of today, AMT 1-month volatility is 22.74%

What 1-month volatility category does AMT fall into?

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

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

AMT 1-month volatility reached a 1-year high of 40.95% on July 2, 2026

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

AMT 1-month volatility reached a 1-year low of 16.01% on October 10, 2025

What is the current 3-month volatility of AMT?

As of today, AMT 3-month volatility is 24.74%

What 3-month volatility category does AMT fall into?

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

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

AMT 3-month volatility reached a 1-year high of 32.81% on August 7, 2026

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

AMT 3-month volatility reached a 1-year low of 19.02% on November 3, 2025

What is the current 1-year volatility of AMT?

As of today, AMT 1-year volatility is 26.46%

What 1-year volatility category does AMT fall into?

Based on its current 1-year historical volatility, AMT falls into the moderate volatility category

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

AMT 1-year volatility reached a 1-year high of 26.68% on October 14, 2025

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

AMT 1-year volatility reached a 1-year low of 22.83% on May 15, 2026

AMT Stock Volatility History & Chart Since 1998

10-Day

19.12%

September 30, 2026

Summary

Current Value: As of today, AMT 10-day volatility is 19.12%, up +10.33% on September 30, 2026
Value Category: Based on its current 10-day historical volatility, AMT falls into the low volatility category
1-Year High: AMT 10-day volatility reached a 1-year high of 44.33% on July 7, 2026
1-Year Low: AMT 10-day volatility reached a 1-year low of 9.95% on January 6, 2026

10-Day Volatility Chart

Performance

AMT Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
10-Day Volatility	Sep 30, 26	19.12%	+10.3%	+23.1%	-55.4%	+17.7%	+38.9%	-33.0%	-6.5%
1-Month Volatility	Sep 30, 26	22.74%	+7.4%	-2.2%	-43.4%	+31.8%	+20.6%	-13.6%	+16.3%
3-Month Volatility	Sep 30, 26	24.74%	-1.4%	-20.7%	-20.8%	+25.8%	+20.6%	+2.1%	+45.9%
1-Year Volatility	Sep 30, 26	26.46%	+0.4%	+1.2%	+3.6%	+8.0%	-0.6%	-8.2%	+27.5%
14-Day RSI	Sep 30, 26	32.77	-13.6%	-39.6%	-10.3%	-24.9%	-20.4%	-2.1%	+15.2%
Beta	Sep 30, 26	-0.07	0.0%	+53.3%	+22.2%	-800.0%	-100.0%	-106.9%	-111.5%
ATR	Sep 30, 26	$3.88	+1.0%	-3.9%	-30.5%	+34.1%	+1.1%	-3.2%	-28.5%
Price	Oct 1, 26	$161.70	-1.2%	-8.1%	-2.6%	-7.9%	-16.4%	-1.7%	-39.4%
200-Day SMA	Sep 30, 26	$177.07	-0.1%	-0.4%	-2.4%	-12.6%	-13.9%	-10.1%	-30.0%
50-Day SMA	Sep 30, 26	$173.04	0.0%	+1.2%	-4.1%	-3.9%	-15.1%	-3.9%	-39.6%
20-Day SMA	Sep 30, 26	$173.25	-0.3%	-0.3%	-4.3%	-2.4%	-10.8%	-0.6%	-39.9%

10-Day Volatility History

Date	Value	Change
Oct 1, 2026	19.12%	+17.7%
Dec 31, 2025	16.25%	-46.5%
Dec 31, 2024	30.39%	+216.2%
Dec 31, 2023	9.61%	-59.5%
Dec 31, 2022	23.72%	+54.8%
Dec 31, 2021	15.32%	-6.5%
Dec 31, 2020	16.39%	-27.3%
Dec 31, 2019	22.56%	-22.2%
Dec 31, 2018	29.01%	+170.6%
Dec 31, 2017	10.72%	+25.4%
Dec 31, 2016	8.55%	-58.8%
Dec 31, 2015	20.77%	+41.0%
Dec 31, 2014	14.73%	+16.5%
Dec 31, 2013	12.64%	-15.0%
Dec 31, 2012	14.87%	-53.7%

Date	Value	Change
Dec 31, 2011	32.09%	+95.0%
Dec 31, 2010	16.46%	+53.8%
Dec 31, 2009	10.70%	-78.3%
Dec 31, 2008	49.35%	+162.2%
Dec 31, 2007	18.82%	+12.2%
Dec 31, 2006	16.78%	+67.1%
Dec 31, 2005	10.04%	-39.2%
Dec 31, 2004	16.51%	-40.7%
Dec 31, 2003	27.83%	-64.9%
Dec 31, 2002	79.19%	+18.3%
Dec 31, 2001	66.93%	+45.9%
Dec 31, 2000	45.87%	-4.9%
Dec 31, 1999	48.22%	+36.8%
Dec 31, 1998	35.24%	-

FAQ

What is the current 10-day volatility of AMT?: As of today, AMT 10-day volatility is 19.12%
What 10-day volatility category does AMT fall into?: Based on its current 10-day historical volatility, AMT falls into the low volatility category
What is AMT 10-day volatility 1-year high?: AMT 10-day volatility reached a 1-year high of 44.33% on July 7, 2026
What is AMT 10-day volatility 1-year low?: AMT 10-day volatility reached a 1-year low of 9.95% on January 6, 2026

1-Month

22.74%

September 30, 2026

Summary

Current Value: As of today, AMT 1-month volatility is 22.74%, up +7.37% on September 30, 2026
Value Category: Based on its current 1-month historical volatility, AMT falls into the low volatility category
1-Year High: AMT 1-month volatility reached a 1-year high of 40.95% on July 2, 2026
1-Year Low: AMT 1-month volatility reached a 1-year low of 16.01% on October 10, 2025

Performance

AMT Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
1-Month Volatility	Sep 30, 26	22.74%	+7.4%	-2.2%	-43.4%	+31.8%	+20.6%	-13.6%	+16.3%
10-Day Volatility	Sep 30, 26	19.12%	+10.3%	+23.1%	-55.4%	+17.7%	+38.9%	-33.0%	-6.5%
3-Month Volatility	Sep 30, 26	24.74%	-1.4%	-20.7%	-20.8%	+25.8%	+20.6%	+2.1%	+45.9%
1-Year Volatility	Sep 30, 26	26.46%	+0.4%	+1.2%	+3.6%	+8.0%	-0.6%	-8.2%	+27.5%
14-Day RSI	Sep 30, 26	32.77	-13.6%	-39.6%	-10.3%	-24.9%	-20.4%	-2.1%	+15.2%
Beta	Sep 30, 26	-0.07	0.0%	+53.3%	+22.2%	-800.0%	-100.0%	-106.9%	-111.5%
ATR	Sep 30, 26	$3.88	+1.0%	-3.9%	-30.5%	+34.1%	+1.1%	-3.2%	-28.5%
Price	Oct 1, 26	$161.70	-1.2%	-8.1%	-2.6%	-7.9%	-16.4%	-1.7%	-39.4%
200-Day SMA	Sep 30, 26	$177.07	-0.1%	-0.4%	-2.4%	-12.6%	-13.9%	-10.1%	-30.0%
50-Day SMA	Sep 30, 26	$173.04	0.0%	+1.2%	-4.1%	-3.9%	-15.1%	-3.9%	-39.6%
20-Day SMA	Sep 30, 26	$173.25	-0.3%	-0.3%	-4.3%	-2.4%	-10.8%	-0.6%	-39.9%

1-Month Volatility History

Date	Value	Change
Oct 1, 2026	22.74%	+18.3%
Dec 31, 2025	19.23%	-27.5%
Dec 31, 2024	26.53%	+70.7%
Dec 31, 2023	15.54%	-33.4%
Dec 31, 2022	23.33%	+18.0%
Dec 31, 2021	19.77%	-4.1%
Dec 31, 2020	20.62%	+1.0%
Dec 31, 2019	20.42%	-16.7%
Dec 31, 2018	24.50%	+42.9%
Dec 31, 2017	17.15%	+21.9%
Dec 31, 2016	14.07%	-32.1%
Dec 31, 2015	20.71%	+36.4%
Dec 31, 2014	15.18%	+6.8%
Dec 31, 2013	14.21%	+19.2%
Dec 31, 2012	11.92%	-52.0%

Date	Value	Change
Dec 31, 2011	24.82%	+66.2%
Dec 31, 2010	14.93%	-21.6%
Dec 31, 2009	19.04%	-69.6%
Dec 31, 2008	62.63%	+119.6%
Dec 31, 2007	28.52%	+57.5%
Dec 31, 2006	18.11%	+26.1%
Dec 31, 2005	14.36%	-33.5%
Dec 31, 2004	21.59%	-27.4%
Dec 31, 2003	29.72%	-73.6%
Dec 31, 2002	112.45%	+30.0%
Dec 31, 2001	86.48%	+6.0%
Dec 31, 2000	81.58%	+55.0%
Dec 31, 1999	52.62%	+20.9%
Dec 31, 1998	43.51%	-

FAQ

What is the current 1-month volatility of AMT?: As of today, AMT 1-month volatility is 22.74%
What 1-month volatility category does AMT fall into?: Based on its current 1-month historical volatility, AMT falls into the low volatility category
What is AMT 1-month volatility 1-year high?: AMT 1-month volatility reached a 1-year high of 40.95% on July 2, 2026
What is AMT 1-month volatility 1-year low?: AMT 1-month volatility reached a 1-year low of 16.01% on October 10, 2025

3-Month

24.74%

September 30, 2026

Summary

Current Value: As of today, AMT 3-month volatility is 24.74%, down -1.39% on September 30, 2026
Value Category: Based on its current 3-month historical volatility, AMT falls into the low volatility category
1-Year High: AMT 3-month volatility reached a 1-year high of 32.81% on August 7, 2026
1-Year Low: AMT 3-month volatility reached a 1-year low of 19.02% on November 3, 2025

Performance

AMT Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
3-Month Volatility	Sep 30, 26	24.74%	-1.4%	-20.7%	-20.8%	+25.8%	+20.6%	+2.1%	+45.9%
10-Day Volatility	Sep 30, 26	19.12%	+10.3%	+23.1%	-55.4%	+17.7%	+38.9%	-33.0%	-6.5%
1-Month Volatility	Sep 30, 26	22.74%	+7.4%	-2.2%	-43.4%	+31.8%	+20.6%	-13.6%	+16.3%
1-Year Volatility	Sep 30, 26	26.46%	+0.4%	+1.2%	+3.6%	+8.0%	-0.6%	-8.2%	+27.5%
14-Day RSI	Sep 30, 26	32.77	-13.6%	-39.6%	-10.3%	-24.9%	-20.4%	-2.1%	+15.2%
Beta	Sep 30, 26	-0.07	0.0%	+53.3%	+22.2%	-800.0%	-100.0%	-106.9%	-111.5%
ATR	Sep 30, 26	$3.88	+1.0%	-3.9%	-30.5%	+34.1%	+1.1%	-3.2%	-28.5%
Price	Oct 1, 26	$161.70	-1.2%	-8.1%	-2.6%	-7.9%	-16.4%	-1.7%	-39.4%
200-Day SMA	Sep 30, 26	$177.07	-0.1%	-0.4%	-2.4%	-12.6%	-13.9%	-10.1%	-30.0%
50-Day SMA	Sep 30, 26	$173.04	0.0%	+1.2%	-4.1%	-3.9%	-15.1%	-3.9%	-39.6%
20-Day SMA	Sep 30, 26	$173.25	-0.3%	-0.3%	-4.3%	-2.4%	-10.8%	-0.6%	-39.9%

3-Month Volatility History

Date	Value	Change
Oct 1, 2026	24.74%	+26.5%
Dec 31, 2025	19.56%	-30.2%
Dec 31, 2024	28.03%	-6.5%
Dec 31, 2023	29.97%	-20.3%
Dec 31, 2022	37.61%	+92.9%
Dec 31, 2021	19.50%	-6.8%
Dec 31, 2020	20.93%	+1.6%
Dec 31, 2019	20.61%	-17.5%
Dec 31, 2018	24.99%	+28.6%
Dec 31, 2017	19.43%	-15.3%
Dec 31, 2016	22.93%	+11.3%
Dec 31, 2015	20.61%	+24.0%
Dec 31, 2014	16.62%	+0.5%
Dec 31, 2013	16.54%	-3.8%
Dec 31, 2012	17.20%	-29.5%

Date	Value	Change
Dec 31, 2011	24.41%	+47.0%
Dec 31, 2010	16.60%	-33.8%
Dec 31, 2009	25.09%	-72.7%
Dec 31, 2008	91.91%	+235.7%
Dec 31, 2007	27.38%	+24.3%
Dec 31, 2006	22.03%	+2.3%
Dec 31, 2005	21.54%	-5.6%
Dec 31, 2004	22.81%	-41.8%
Dec 31, 2003	39.19%	-77.8%
Dec 31, 2002	176.29%	+62.4%
Dec 31, 2001	108.55%	+39.5%
Dec 31, 2000	77.82%	+63.2%
Dec 31, 1999	47.69%	-47.7%
Dec 31, 1998	91.13%	-

FAQ

What is the current 3-month volatility of AMT?: As of today, AMT 3-month volatility is 24.74%
What 3-month volatility category does AMT fall into?: Based on its current 3-month historical volatility, AMT falls into the low volatility category
What is AMT 3-month volatility 1-year high?: AMT 3-month volatility reached a 1-year high of 32.81% on August 7, 2026
What is AMT 3-month volatility 1-year low?: AMT 3-month volatility reached a 1-year low of 19.02% on November 3, 2025

1-Year

26.46%

September 30, 2026

Summary

Current Value: As of today, AMT 1-year volatility is 26.46%, up +0.42% on September 30, 2026
Value Category: Based on its current 1-year historical volatility, AMT falls into the moderate volatility category
1-Year High: AMT 1-year volatility reached a 1-year high of 26.68% on October 14, 2025
1-Year Low: AMT 1-year volatility reached a 1-year low of 22.83% on May 15, 2026

Performance

AMT Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
1-Year Volatility	Sep 30, 26	26.46%	+0.4%	+1.2%	+3.6%	+8.0%	-0.6%	-8.2%	+27.5%
10-Day Volatility	Sep 30, 26	19.12%	+10.3%	+23.1%	-55.4%	+17.7%	+38.9%	-33.0%	-6.5%
1-Month Volatility	Sep 30, 26	22.74%	+7.4%	-2.2%	-43.4%	+31.8%	+20.6%	-13.6%	+16.3%
3-Month Volatility	Sep 30, 26	24.74%	-1.4%	-20.7%	-20.8%	+25.8%	+20.6%	+2.1%	+45.9%
1-Year Volatility	Sep 30, 26	26.46%	+0.4%	+1.2%	+3.6%	+8.0%	-0.6%	-8.2%	+27.5%
14-Day RSI	Sep 30, 26	32.77	-13.6%	-39.6%	-10.3%	-24.9%	-20.4%	-2.1%	+15.2%
Beta	Sep 30, 26	-0.07	0.0%	+53.3%	+22.2%	-800.0%	-100.0%	-106.9%	-111.5%
ATR	Sep 30, 26	$3.88	+1.0%	-3.9%	-30.5%	+34.1%	+1.1%	-3.2%	-28.5%
Price	Oct 1, 26	$161.70	-1.2%	-8.1%	-2.6%	-7.9%	-16.4%	-1.7%	-39.4%
200-Day SMA	Sep 30, 26	$177.07	-0.1%	-0.4%	-2.4%	-12.6%	-13.9%	-10.1%	-30.0%
50-Day SMA	Sep 30, 26	$173.04	0.0%	+1.2%	-4.1%	-3.9%	-15.1%	-3.9%	-39.6%
20-Day SMA	Sep 30, 26	$173.25	-0.3%	-0.3%	-4.3%	-2.4%	-10.8%	-0.6%	-39.9%

1-Year Volatility History

Date	Value	Change
Oct 1, 2026	26.46%	+8.0%
Dec 31, 2025	24.51%	-1.2%
Dec 31, 2024	24.82%	-7.3%
Dec 31, 2023	26.78%	-16.4%
Dec 31, 2022	32.05%	+57.6%
Dec 31, 2021	20.34%	-53.6%
Dec 31, 2020	43.87%	+141.4%
Dec 31, 2019	18.17%	-11.1%
Dec 31, 2018	20.43%	+30.0%
Dec 31, 2017	15.71%	-24.4%
Dec 31, 2016	20.77%	+2.7%
Dec 31, 2015	20.22%	+30.8%
Dec 31, 2014	15.46%	-24.1%
Dec 31, 2013	20.37%	+18.6%
Dec 31, 2012	17.18%	-40.2%

Date	Value	Change
Dec 31, 2011	28.71%	+24.0%
Dec 31, 2010	23.16%	-34.6%
Dec 31, 2009	35.39%	-38.3%
Dec 31, 2008	57.36%	+127.1%
Dec 31, 2007	25.26%	-3.2%
Dec 31, 2006	26.10%	+25.4%
Dec 31, 2005	20.81%	-37.1%
Dec 31, 2004	33.11%	-38.7%
Dec 31, 2003	53.98%	-60.0%
Dec 31, 2002	134.89%	+60.1%
Dec 31, 2001	84.23%	+28.8%
Dec 31, 2000	65.39%	+29.0%
Dec 31, 1999	50.68%	-30.0%
Dec 31, 1998	72.39%	-

FAQ

What is the current 1-year volatility of AMT?: As of today, AMT 1-year volatility is 26.46%
What 1-year volatility category does AMT fall into?: Based on its current 1-year historical volatility, AMT falls into the moderate volatility category
What is AMT 1-year volatility 1-year high?: AMT 1-year volatility reached a 1-year high of 26.68% on October 14, 2025
What is AMT 1-year volatility 1-year low?: AMT 1-year volatility reached a 1-year low of 22.83% on May 15, 2026

Data Sources & References

AMT Official Website www.americantower.com
Most Recent Annual Report (10-K) www.sec.gov/Archives/edgar/data/1053507/000105350726000035/0001053507-26-000035-index.htm
AMT Profile on Yahoo Finance finance.yahoo.com/quote/AMT
AMT Profile on NASDAQ.com www.nasdaq.com/market-activity/stocks/amt