What is the current 10-day volatility of HEI?

As of today, HEI 10-day volatility is 18.03%

What 10-day volatility category does HEI fall into?

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

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

HEI 10-day volatility reached a 1-year high of 67.38% on June 10, 2026

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

HEI 10-day volatility reached a 1-year low of 13.27% on August 20, 2025

What is the current 1-month volatility of HEI?

As of today, HEI 1-month volatility is 21.38%

What 1-month volatility category does HEI fall into?

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

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

HEI 1-month volatility reached a 1-year high of 54.28% on June 1, 2026

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

HEI 1-month volatility reached a 1-year low of 15.70% on September 29, 2025

What is the current 3-month volatility of HEI?

As of today, HEI 3-month volatility is 35.00%

What 3-month volatility category does HEI fall into?

Based on its current 3-month historical volatility, HEI falls into the moderate volatility category

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

HEI 3-month volatility reached a 1-year high of 44.77% on June 11, 2026

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

HEI 3-month volatility reached a 1-year low of 19.30% on November 28, 2025

What is the current 1-year volatility of HEI?

As of today, HEI 1-year volatility is 33.01%

What 1-year volatility category does HEI fall into?

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

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

HEI 1-year volatility reached a 1-year high of 33.88% on July 31, 2026

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

HEI 1-year volatility reached a 1-year low of 29.00% on February 27, 2026

HEI Stock Volatility History & Chart Since 1980

10-Day

18.03%

August 17, 2026

Summary

Current Value: As of today, HEI 10-day volatility is 18.03%, up +5.44% on August 17, 2026
Value Category: Based on its current 10-day historical volatility, HEI falls into the low volatility category
1-Year High: HEI 10-day volatility reached a 1-year high of 67.38% on June 10, 2026
1-Year Low: HEI 10-day volatility reached a 1-year low of 13.27% on August 20, 2025

10-Day Volatility Chart

Performance

HEI Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
10-Day Volatility	Aug 17, 26	18.03%	+5.4%	-29.7%	-59.6%	-49.8%	-52.0%	+6.7%	-29.5%
1-Month Volatility	Aug 17, 26	21.38%	-4.2%	-11.7%	-48.1%	-27.7%	-32.0%	+26.4%	-20.6%
3-Month Volatility	Aug 17, 26	35.00%	-0.2%	-13.1%	-16.4%	+44.0%	+25.0%	+34.6%	+53.8%
1-Year Volatility	Aug 17, 26	33.01%	+0.3%	-1.8%	+5.7%	+8.2%	+9.7%	+22.8%	+9.6%
14-Day RSI	Aug 17, 26	61.52	-5.9%	+21.8%	+9.8%	+16.3%	+48.4%	+96.2%	+69.4%
Beta	Aug 17, 26	1.17	0.0%	-5.7%	+0.9%	+80.0%	+74.6%	+28.6%	-1.7%
ATR	Aug 17, 26	$9.32	-2.3%	-5.2%	-3.2%	+28.4%	+26.7%	+223.9%	+261.6%
Price	Aug 17, 26	$371.28	-0.9%	+8.3%	+26.5%	+14.7%	+20.5%	+125.9%	+191.4%
200-Day SMA	Aug 17, 26	$320.98	+0.1%	+1.5%	+2.7%	+6.3%	+18.9%	+92.0%	+142.1%
50-Day SMA	Aug 17, 26	$349.56	+0.2%	+6.6%	+23.4%	+10.4%	+10.4%	+102.5%	+155.0%
20-Day SMA	Aug 17, 26	$359.97	+0.4%	+3.5%	+29.0%	+12.8%	+13.0%	+107.5%	+171.4%

10-Day Volatility History

Date	Value	Change
Aug 18, 2026	18.03%	-49.8%
Dec 31, 2025	35.90%	-18.5%
Dec 31, 2024	44.07%	+34.2%
Dec 31, 2023	32.85%	+14.8%
Dec 31, 2022	28.61%	+34.4%
Dec 31, 2021	21.28%	+13.3%
Dec 31, 2020	18.79%	-38.1%
Dec 31, 2019	30.34%	-40.6%
Dec 31, 2018	51.09%	+73.8%
Dec 31, 2017	29.39%	+53.1%
Dec 31, 2016	19.20%	-53.2%
Dec 31, 2015	41.04%	+44.3%
Dec 31, 2014	28.44%	+21.1%
Dec 31, 2013	23.49%	-6.2%
Dec 31, 2012	25.05%	-43.8%
Dec 31, 2011	44.60%	+195.4%
Dec 31, 2010	15.10%	-53.0%
Dec 31, 2009	32.10%	-60.7%
Dec 31, 2008	81.73%	+0.1%
Dec 31, 2007	81.62%	+121.9%
Dec 31, 2006	36.79%	-20.2%
Dec 31, 2005	46.11%	+95.1%
Dec 31, 2004	23.63%	+19.2%
Dec 31, 2003	19.83%	-57.8%

Date	Value	Change
Dec 31, 2002	46.97%	-25.7%
Dec 31, 2001	63.19%	+3.3%
Dec 31, 2000	61.17%	-36.9%
Dec 31, 1999	96.97%	+76.8%
Dec 31, 1998	54.86%	-0.8%
Dec 31, 1997	55.28%	-26.2%
Dec 31, 1996	74.93%	+503.8%
Dec 31, 1995	12.41%	-68.6%
Dec 31, 1994	39.52%	+58.1%
Dec 31, 1993	25.00%	+160.7%
Dec 31, 1992	9.59%	-20.1%
Dec 31, 1991	12.01%	-37.3%
Dec 31, 1990	19.14%	-72.2%
Dec 31, 1989	68.87%	+123.2%
Dec 31, 1988	30.85%	-27.9%
Dec 31, 1987	42.78%	+134.0%
Dec 31, 1986	18.28%	-40.8%
Dec 31, 1985	30.89%	-7.8%
Dec 31, 1984	33.50%	-12.3%
Dec 31, 1983	38.20%	-29.9%
Dec 31, 1982	54.50%	+56.2%
Dec 31, 1981	34.90%	-38.1%
Dec 31, 1980	56.36%	-

FAQ

What is the current 10-day volatility of HEI?: As of today, HEI 10-day volatility is 18.03%
What 10-day volatility category does HEI fall into?: Based on its current 10-day historical volatility, HEI falls into the low volatility category
What is HEI 10-day volatility 1-year high?: HEI 10-day volatility reached a 1-year high of 67.38% on June 10, 2026
What is HEI 10-day volatility 1-year low?: HEI 10-day volatility reached a 1-year low of 13.27% on August 20, 2025

1-Month

21.38%

August 17, 2026

Summary

Current Value: As of today, HEI 1-month volatility is 21.38%, down -4.17% on August 17, 2026
Value Category: Based on its current 1-month historical volatility, HEI falls into the low volatility category
1-Year High: HEI 1-month volatility reached a 1-year high of 54.28% on June 1, 2026
1-Year Low: HEI 1-month volatility reached a 1-year low of 15.70% on September 29, 2025

Performance

HEI Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
1-Month Volatility	Aug 17, 26	21.38%	-4.2%	-11.7%	-48.1%	-27.7%	-32.0%	+26.4%	-20.6%
10-Day Volatility	Aug 17, 26	18.03%	+5.4%	-29.7%	-59.6%	-49.8%	-52.0%	+6.7%	-29.5%
3-Month Volatility	Aug 17, 26	35.00%	-0.2%	-13.1%	-16.4%	+44.0%	+25.0%	+34.6%	+53.8%
1-Year Volatility	Aug 17, 26	33.01%	+0.3%	-1.8%	+5.7%	+8.2%	+9.7%	+22.8%	+9.6%
14-Day RSI	Aug 17, 26	61.52	-5.9%	+21.8%	+9.8%	+16.3%	+48.4%	+96.2%	+69.4%
Beta	Aug 17, 26	1.17	0.0%	-5.7%	+0.9%	+80.0%	+74.6%	+28.6%	-1.7%
ATR	Aug 17, 26	$9.32	-2.3%	-5.2%	-3.2%	+28.4%	+26.7%	+223.9%	+261.6%
Price	Aug 17, 26	$371.28	-0.9%	+8.3%	+26.5%	+14.7%	+20.5%	+125.9%	+191.4%
200-Day SMA	Aug 17, 26	$320.98	+0.1%	+1.5%	+2.7%	+6.3%	+18.9%	+92.0%	+142.1%
50-Day SMA	Aug 17, 26	$349.56	+0.2%	+6.6%	+23.4%	+10.4%	+10.4%	+102.5%	+155.0%
20-Day SMA	Aug 17, 26	$359.97	+0.4%	+3.5%	+29.0%	+12.8%	+13.0%	+107.5%	+171.4%

1-Month Volatility History

Date	Value	Change
Aug 18, 2026	21.38%	-28.9%
Dec 31, 2025	30.08%	-13.2%
Dec 31, 2024	34.66%	+18.4%
Dec 31, 2023	29.28%	+27.4%
Dec 31, 2022	22.99%	-27.3%
Dec 31, 2021	31.63%	+49.6%
Dec 31, 2020	21.15%	-29.5%
Dec 31, 2019	30.01%	-25.8%
Dec 31, 2018	40.45%	+85.1%
Dec 31, 2017	21.85%	-7.9%
Dec 31, 2016	23.73%	-30.7%
Dec 31, 2015	34.25%	-7.5%
Dec 31, 2014	37.03%	+29.0%
Dec 31, 2013	28.71%	-10.3%
Dec 31, 2012	32.02%	-19.8%
Dec 31, 2011	39.94%	+47.3%
Dec 31, 2010	27.11%	-4.9%
Dec 31, 2009	28.50%	-63.8%
Dec 31, 2008	78.69%	+18.7%
Dec 31, 2007	66.32%	+143.5%
Dec 31, 2006	27.24%	-30.2%
Dec 31, 2005	39.02%	+47.4%
Dec 31, 2004	26.48%	+39.8%
Dec 31, 2003	18.94%	-53.3%

Date	Value	Change
Dec 31, 2002	40.60%	-21.1%
Dec 31, 2001	51.43%	+2.2%
Dec 31, 2000	50.31%	-34.7%
Dec 31, 1999	77.08%	+71.3%
Dec 31, 1998	45.01%	+7.8%
Dec 31, 1997	41.75%	-25.6%
Dec 31, 1996	56.15%	+445.7%
Dec 31, 1995	10.29%	-71.7%
Dec 31, 1994	36.33%	+108.6%
Dec 31, 1993	17.42%	+51.2%
Dec 31, 1992	11.52%	-6.8%
Dec 31, 1991	12.36%	-55.7%
Dec 31, 1990	27.90%	-43.0%
Dec 31, 1989	48.95%	+97.6%
Dec 31, 1988	24.77%	-64.3%
Dec 31, 1987	69.40%	+79.4%
Dec 31, 1986	38.68%	+36.3%
Dec 31, 1985	28.38%	-34.0%
Dec 31, 1984	43.02%	-21.8%
Dec 31, 1983	55.00%	+7.3%
Dec 31, 1982	51.28%	+57.1%
Dec 31, 1981	32.64%	-44.9%
Dec 31, 1980	59.20%	-

FAQ

What is the current 1-month volatility of HEI?: As of today, HEI 1-month volatility is 21.38%
What 1-month volatility category does HEI fall into?: Based on its current 1-month historical volatility, HEI falls into the low volatility category
What is HEI 1-month volatility 1-year high?: HEI 1-month volatility reached a 1-year high of 54.28% on June 1, 2026
What is HEI 1-month volatility 1-year low?: HEI 1-month volatility reached a 1-year low of 15.70% on September 29, 2025

3-Month

35.00%

August 17, 2026

Summary

Current Value: As of today, HEI 3-month volatility is 35.00%, down -0.17% on August 17, 2026
Value Category: Based on its current 3-month historical volatility, HEI falls into the moderate volatility category
1-Year High: HEI 3-month volatility reached a 1-year high of 44.77% on June 11, 2026
1-Year Low: HEI 3-month volatility reached a 1-year low of 19.30% on November 28, 2025

Performance

HEI Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
3-Month Volatility	Aug 17, 26	35.00%	-0.2%	-13.1%	-16.4%	+44.0%	+25.0%	+34.6%	+53.8%
10-Day Volatility	Aug 17, 26	18.03%	+5.4%	-29.7%	-59.6%	-49.8%	-52.0%	+6.7%	-29.5%
1-Month Volatility	Aug 17, 26	21.38%	-4.2%	-11.7%	-48.1%	-27.7%	-32.0%	+26.4%	-20.6%
1-Year Volatility	Aug 17, 26	33.01%	+0.3%	-1.8%	+5.7%	+8.2%	+9.7%	+22.8%	+9.6%
14-Day RSI	Aug 17, 26	61.52	-5.9%	+21.8%	+9.8%	+16.3%	+48.4%	+96.2%	+69.4%
Beta	Aug 17, 26	1.17	0.0%	-5.7%	+0.9%	+80.0%	+74.6%	+28.6%	-1.7%
ATR	Aug 17, 26	$9.32	-2.3%	-5.2%	-3.2%	+28.4%	+26.7%	+223.9%	+261.6%
Price	Aug 17, 26	$371.28	-0.9%	+8.3%	+26.5%	+14.7%	+20.5%	+125.9%	+191.4%
200-Day SMA	Aug 17, 26	$320.98	+0.1%	+1.5%	+2.7%	+6.3%	+18.9%	+92.0%	+142.1%
50-Day SMA	Aug 17, 26	$349.56	+0.2%	+6.6%	+23.4%	+10.4%	+10.4%	+102.5%	+155.0%
20-Day SMA	Aug 17, 26	$359.97	+0.4%	+3.5%	+29.0%	+12.8%	+13.0%	+107.5%	+171.4%

3-Month Volatility History

Date	Value	Change
Aug 18, 2026	34.75%	+43.7%
Dec 31, 2025	24.18%	-14.5%
Dec 31, 2024	28.29%	+26.2%
Dec 31, 2023	22.42%	-22.6%
Dec 31, 2022	28.96%	+9.1%
Dec 31, 2021	26.55%	-24.4%
Dec 31, 2020	35.11%	+43.4%
Dec 31, 2019	24.48%	-27.1%
Dec 31, 2018	33.59%	+65.5%
Dec 31, 2017	20.30%	-3.0%
Dec 31, 2016	20.93%	-13.5%
Dec 31, 2015	24.21%	-27.6%
Dec 31, 2014	33.43%	+27.0%
Dec 31, 2013	26.32%	-4.8%
Dec 31, 2012	27.66%	-46.3%
Dec 31, 2011	51.53%	+89.4%
Dec 31, 2010	27.21%	-19.8%
Dec 31, 2009	33.93%	-59.9%
Dec 31, 2008	84.62%	+73.7%
Dec 31, 2007	48.71%	+87.1%
Dec 31, 2006	26.03%	-14.0%
Dec 31, 2005	30.27%	+6.2%
Dec 31, 2004	28.49%	+0.8%
Dec 31, 2003	28.25%	-39.5%

Date	Value	Change
Dec 31, 2002	46.66%	-11.4%
Dec 31, 2001	52.64%	+14.9%
Dec 31, 2000	45.82%	-21.1%
Dec 31, 1999	58.06%	-1.4%
Dec 31, 1998	58.91%	+20.5%
Dec 31, 1997	48.87%	+22.6%
Dec 31, 1996	39.86%	+131.5%
Dec 31, 1995	17.22%	-27.3%
Dec 31, 1994	23.68%	-34.4%
Dec 31, 1993	36.10%	+97.4%
Dec 31, 1992	18.29%	-1.0%
Dec 31, 1991	18.47%	-26.4%
Dec 31, 1990	25.11%	-34.8%
Dec 31, 1989	38.53%	+41.6%
Dec 31, 1988	27.22%	-64.8%
Dec 31, 1987	77.34%	+158.1%
Dec 31, 1986	29.97%	-15.7%
Dec 31, 1985	35.57%	-6.0%
Dec 31, 1984	37.85%	-30.4%
Dec 31, 1983	54.40%	-20.2%
Dec 31, 1982	68.21%	+42.9%
Dec 31, 1981	47.72%	-21.9%
Dec 31, 1980	61.14%	-

FAQ

What is the current 3-month volatility of HEI?: As of today, HEI 3-month volatility is 35.00%
What 3-month volatility category does HEI fall into?: Based on its current 3-month historical volatility, HEI falls into the moderate volatility category
What is HEI 3-month volatility 1-year high?: HEI 3-month volatility reached a 1-year high of 44.77% on June 11, 2026
What is HEI 3-month volatility 1-year low?: HEI 3-month volatility reached a 1-year low of 19.30% on November 28, 2025

1-Year

33.01%

August 17, 2026

Summary

Current Value: As of today, HEI 1-year volatility is 33.01%, up +0.33% on August 17, 2026
Value Category: Based on its current 1-year historical volatility, HEI falls into the moderate volatility category
1-Year High: HEI 1-year volatility reached a 1-year high of 33.88% on July 31, 2026
1-Year Low: HEI 1-year volatility reached a 1-year low of 29.00% on February 27, 2026

Performance

HEI Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
1-Year Volatility	Aug 17, 26	33.01%	+0.3%	-1.8%	+5.7%	+8.2%	+9.7%	+22.8%	+9.6%
10-Day Volatility	Aug 17, 26	18.03%	+5.4%	-29.7%	-59.6%	-49.8%	-52.0%	+6.7%	-29.5%
1-Month Volatility	Aug 17, 26	21.38%	-4.2%	-11.7%	-48.1%	-27.7%	-32.0%	+26.4%	-20.6%
3-Month Volatility	Aug 17, 26	35.00%	-0.2%	-13.1%	-16.4%	+44.0%	+25.0%	+34.6%	+53.8%
1-Year Volatility	Aug 17, 26	33.01%	+0.3%	-1.8%	+5.7%	+8.2%	+9.7%	+22.8%	+9.6%
14-Day RSI	Aug 17, 26	61.52	-5.9%	+21.8%	+9.8%	+16.3%	+48.4%	+96.2%	+69.4%
Beta	Aug 17, 26	1.17	0.0%	-5.7%	+0.9%	+80.0%	+74.6%	+28.6%	-1.7%
ATR	Aug 17, 26	$9.32	-2.3%	-5.2%	-3.2%	+28.4%	+26.7%	+223.9%	+261.6%
Price	Aug 17, 26	$371.28	-0.9%	+8.3%	+26.5%	+14.7%	+20.5%	+125.9%	+191.4%
200-Day SMA	Aug 17, 26	$320.98	+0.1%	+1.5%	+2.7%	+6.3%	+18.9%	+92.0%	+142.1%
50-Day SMA	Aug 17, 26	$349.56	+0.2%	+6.6%	+23.4%	+10.4%	+10.4%	+102.5%	+155.0%
20-Day SMA	Aug 17, 26	$359.97	+0.4%	+3.5%	+29.0%	+12.8%	+13.0%	+107.5%	+171.4%

1-Year Volatility History

Date	Value	Change
Aug 18, 2026	32.96%	+8.0%
Dec 31, 2025	30.51%	+34.7%
Dec 31, 2024	22.65%	-6.0%
Dec 31, 2023	24.10%	-13.6%
Dec 31, 2022	27.89%	+5.4%
Dec 31, 2021	26.46%	-52.7%
Dec 31, 2020	55.99%	+117.9%
Dec 31, 2019	25.69%	-8.6%
Dec 31, 2018	28.12%	+44.1%
Dec 31, 2017	19.52%	-11.0%
Dec 31, 2016	21.94%	-7.9%
Dec 31, 2015	23.82%	-21.7%
Dec 31, 2014	30.43%	+22.5%
Dec 31, 2013	24.84%	-17.6%
Dec 31, 2012	30.15%	-34.5%
Dec 31, 2011	46.06%	+27.2%
Dec 31, 2010	36.21%	-30.1%
Dec 31, 2009	51.79%	-13.3%
Dec 31, 2008	59.74%	+54.8%
Dec 31, 2007	38.60%	+30.9%
Dec 31, 2006	29.48%	+10.4%
Dec 31, 2005	26.70%	-26.6%
Dec 31, 2004	36.38%	-6.7%
Dec 31, 2003	38.99%	-14.4%

Date	Value	Change
Dec 31, 2002	45.56%	-13.2%
Dec 31, 2001	52.51%	-2.7%
Dec 31, 2000	53.97%	+20.8%
Dec 31, 1999	44.68%	-17.4%
Dec 31, 1998	54.10%	+23.5%
Dec 31, 1997	43.80%	+0.5%
Dec 31, 1996	43.60%	+48.0%
Dec 31, 1995	29.45%	+37.7%
Dec 31, 1994	21.39%	-21.0%
Dec 31, 1993	27.06%	+3.0%
Dec 31, 1992	26.27%	+15.8%
Dec 31, 1991	22.68%	-31.2%
Dec 31, 1990	32.95%	-1.9%
Dec 31, 1989	33.59%	-13.5%
Dec 31, 1988	38.83%	-19.1%
Dec 31, 1987	48.00%	+9.8%
Dec 31, 1986	43.71%	+8.4%
Dec 31, 1985	40.31%	-18.2%
Dec 31, 1984	49.27%	-8.9%
Dec 31, 1983	54.09%	-2.8%
Dec 31, 1982	55.62%	+5.9%
Dec 31, 1981	52.51%	-20.6%
Dec 31, 1980	66.12%	-

FAQ

What is the current 1-year volatility of HEI?: As of today, HEI 1-year volatility is 33.01%
What 1-year volatility category does HEI fall into?: Based on its current 1-year historical volatility, HEI falls into the moderate volatility category
What is HEI 1-year volatility 1-year high?: HEI 1-year volatility reached a 1-year high of 33.88% on July 31, 2026
What is HEI 1-year volatility 1-year low?: HEI 1-year volatility reached a 1-year low of 29.00% on February 27, 2026

Data Sources & References

HEI Official Website www.heico.com
Most Recent Annual Report (10-K) www.sec.gov/Archives/edgar/data/46619/000004661925000082/0000046619-25-000082-index.htm
HEI Profile on Yahoo Finance finance.yahoo.com/quote/HEI
HEI Profile on NASDAQ.com www.nasdaq.com/market-activity/stocks/hei