What is the current 10-day volatility of CMU?

As of today, CMU 10-day volatility is 10.97%

What 10-day volatility category does CMU fall into?

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

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

CMU 10-day volatility reached a 1-year high of 30.71% on April 14, 2025

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

CMU 10-day volatility reached a 1-year low of 3.11% on December 16, 2025

What is the current 1-month volatility of CMU?

As of today, CMU 1-month volatility is 13.49%

What 1-month volatility category does CMU fall into?

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

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

CMU 1-month volatility reached a 1-year high of 23.87% on May 2, 2025

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

CMU 1-month volatility reached a 1-year low of 4.72% on February 20, 2026

What is the current 3-month volatility of CMU?

As of today, CMU 3-month volatility is 9.69%

What 3-month volatility category does CMU fall into?

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

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

CMU 3-month volatility reached a 1-year high of 14.66% on May 2, 2025

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

CMU 3-month volatility reached a 1-year low of 6.54% on March 3, 2026

What is the current 1-year volatility of CMU?

As of today, CMU 1-year volatility is 10.33%

What 1-year volatility category does CMU fall into?

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

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

CMU 1-year volatility reached a 1-year high of 10.57% on May 2, 2025

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

CMU 1-year volatility reached a 1-year low of 8.58% on April 4, 2025

CMU Stock Volatility History & Chart Since 1987

10-Day

10.97%

March 25, 2026

Summary

Current Value: As of today, CMU 10-day volatility is 10.97%, up +20.02% on March 25, 2026
Value Category: Based on its current 10-day historical volatility, CMU falls into the very low volatility category
1-Year High: CMU 10-day volatility reached a 1-year high of 30.71% on April 14, 2025
1-Year Low: CMU 10-day volatility reached a 1-year low of 3.11% on December 16, 2025

10-Day Volatility Chart

Performance

CMU Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
10-Day Volatility	Mar 25, 26	10.97%	+20.0%	+16.8%	+100.2%	+78.1%	+22.2%	-25.2%	+1.8%
1-Month Volatility	Mar 25, 26	13.49%	-0.1%	+90.8%	+54.0%	+136.3%	+78.0%	-9.8%	+41.1%
3-Month Volatility	Mar 25, 26	9.69%	+1.6%	+24.7%	+17.4%	+19.3%	+23.0%	-28.6%	-44.0%
1-Year Volatility	Mar 25, 26	10.33%	+0.2%	+4.5%	+3.8%	+3.6%	+19.8%	-37.0%	-38.5%
14-Day RSI	Mar 25, 26	40.53	+22.9%	-39.5%	-21.0%	-29.2%	+12.0%	-13.4%	-7.3%
Beta	Mar 25, 26	0.11	0.0%	+10.0%	+10.0%	0.0%	+22.2%	-47.6%	-62.1%
ATR	Mar 25, 26	$0.04	-2.1%	+8.3%	+55.2%	+51.3%	+36.4%	-6.1%	-28.4%
	Mar 25, 26	$3.54	+0.8%	-2.2%	+1.4%	+0.8%	+1.4%	+12.7%	-19.9%
200-Day SMA	Mar 25, 26	$3.45	+0.0%	+0.7%	+1.6%	+1.6%	-2.8%	+6.7%	-20.4%
50-Day SMA	Mar 25, 26	$3.58	+0.0%	+1.1%	+2.2%	+2.2%	+0.9%	+10.9%	-20.5%

10-Day Volatility History

Date	Value	Change
Mar 26, 2026	10.97%	+78.1%
Dec 31, 2025	6.16%	-45.8%
Dec 31, 2024	11.36%	+12.6%
Dec 31, 2023	10.09%	+8.5%
Dec 31, 2022	9.30%	-5.0%
Dec 31, 2021	9.79%	-25.9%
Dec 31, 2020	13.22%	+23.0%
Dec 31, 2019	10.75%	-19.2%
Dec 31, 2018	13.31%	-8.1%
Dec 31, 2017	14.48%	+4.9%
Dec 31, 2016	13.80%	+34.4%
Dec 31, 2015	10.27%	-2.6%
Dec 31, 2014	10.54%	-46.8%
Dec 31, 2013	19.80%	+85.7%
Dec 31, 2012	10.66%	-35.2%
Dec 31, 2011	16.44%	-52.4%
Dec 31, 2010	34.54%	+179.4%
Dec 31, 2009	12.36%	-74.8%
Dec 31, 2008	49.13%	+220.7%
Dec 31, 2007	15.32%	+17.0%

Date	Value	Change
Dec 31, 2006	13.09%	+67.4%
Dec 31, 2005	7.82%	-33.1%
Dec 31, 2004	11.69%	+9.7%
Dec 31, 2003	10.66%	-35.7%
Dec 31, 2002	16.59%	+1.3%
Dec 31, 2001	16.38%	-21.4%
Dec 31, 2000	20.84%	-38.8%
Dec 31, 1999	34.07%	+81.6%
Dec 31, 1998	18.76%	+45.7%
Dec 31, 1997	12.88%	-25.2%
Dec 31, 1996	17.22%	-41.7%
Dec 31, 1995	29.52%	-18.4%
Dec 31, 1994	36.16%	+120.5%
Dec 31, 1993	16.40%	-20.0%
Dec 31, 1992	20.51%	-14.3%
Dec 31, 1991	23.93%	-6.6%
Dec 31, 1990	25.62%	-23.0%
Dec 31, 1989	33.29%	+79.0%
Dec 31, 1988	18.60%	-5.2%
Dec 31, 1987	19.62%	-

FAQ

What is the current 10-day volatility of CMU?
As of today, CMU 10-day volatility is 10.97%
What 10-day volatility category does CMU fall into?
Based on its current 10-day historical volatility, CMU falls into the very low volatility category
What is CMU 10-day volatility 1-year high?
CMU 10-day volatility reached a 1-year high of 30.71% on April 14, 2025
What is CMU 10-day volatility 1-year low?
CMU 10-day volatility reached a 1-year low of 3.11% on December 16, 2025

1-Month

13.49%

March 25, 2026

Summary

Current Value: As of today, CMU 1-month volatility is 13.49%, down -0.07% on March 25, 2026
Value Category: Based on its current 1-month historical volatility, CMU falls into the very low volatility category
1-Year High: CMU 1-month volatility reached a 1-year high of 23.87% on May 2, 2025
1-Year Low: CMU 1-month volatility reached a 1-year low of 4.72% on February 20, 2026

Performance

CMU Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
1-Month Volatility	Mar 25, 26	13.49%	-0.1%	+90.8%	+54.0%	+136.3%	+78.0%	-9.8%	+41.1%
10-Day Volatility	Mar 25, 26	10.97%	+20.0%	+16.8%	+100.2%	+78.1%	+22.2%	-25.2%	+1.8%
3-Month Volatility	Mar 25, 26	9.69%	+1.6%	+24.7%	+17.4%	+19.3%	+23.0%	-28.6%	-44.0%
1-Year Volatility	Mar 25, 26	10.33%	+0.2%	+4.5%	+3.8%	+3.6%	+19.8%	-37.0%	-38.5%
14-Day RSI	Mar 25, 26	40.53	+22.9%	-39.5%	-21.0%	-29.2%	+12.0%	-13.4%	-7.3%
Beta	Mar 25, 26	0.11	0.0%	+10.0%	+10.0%	0.0%	+22.2%	-47.6%	-62.1%
ATR	Mar 25, 26	$0.04	-2.1%	+8.3%	+55.2%	+51.3%	+36.4%	-6.1%	-28.4%
	Mar 25, 26	$3.54	+0.8%	-2.2%	+1.4%	+0.8%	+1.4%	+12.7%	-19.9%
200-Day SMA	Mar 25, 26	$3.45	+0.0%	+0.7%	+1.6%	+1.6%	-2.8%	+6.7%	-20.4%
50-Day SMA	Mar 25, 26	$3.58	+0.0%	+1.1%	+2.2%	+2.2%	+0.9%	+10.9%	-20.5%

1-Month Volatility History

Date	Value	Change
Mar 26, 2026	13.49%	+65.7%
Dec 31, 2025	8.14%	-11.0%
Dec 31, 2024	9.15%	-20.2%
Dec 31, 2023	11.46%	-25.0%
Dec 31, 2022	15.29%	+38.6%
Dec 31, 2021	11.03%	+4.7%
Dec 31, 2020	10.53%	-28.9%
Dec 31, 2019	14.80%	+14.5%
Dec 31, 2018	12.93%	+6.2%
Dec 31, 2017	12.18%	-19.2%
Dec 31, 2016	15.08%	+19.6%
Dec 31, 2015	12.61%	+14.0%
Dec 31, 2014	11.06%	-38.9%
Dec 31, 2013	18.11%	+22.4%
Dec 31, 2012	14.80%	-29.0%
Dec 31, 2011	20.84%	-38.1%
Dec 31, 2010	33.69%	+106.6%
Dec 31, 2009	16.31%	-70.3%
Dec 31, 2008	54.88%	+226.3%
Dec 31, 2007	16.82%	+38.4%

Date	Value	Change
Dec 31, 2006	12.15%	+19.6%
Dec 31, 2005	10.16%	-16.1%
Dec 31, 2004	12.11%	+3.9%
Dec 31, 2003	11.66%	-30.4%
Dec 31, 2002	16.76%	-4.7%
Dec 31, 2001	17.58%	-30.3%
Dec 31, 2000	25.24%	-29.5%
Dec 31, 1999	35.79%	+118.2%
Dec 31, 1998	16.40%	+44.0%
Dec 31, 1997	11.39%	-36.3%
Dec 31, 1996	17.87%	-29.7%
Dec 31, 1995	25.41%	-20.1%
Dec 31, 1994	31.81%	+54.9%
Dec 31, 1993	20.53%	-19.3%
Dec 31, 1992	25.44%	+10.5%
Dec 31, 1991	23.02%	-1.5%
Dec 31, 1990	23.38%	+0.1%
Dec 31, 1989	23.35%	+55.6%
Dec 31, 1988	15.01%	-38.0%
Dec 31, 1987	24.21%	-

FAQ

What is the current 1-month volatility of CMU?
As of today, CMU 1-month volatility is 13.49%
What 1-month volatility category does CMU fall into?
Based on its current 1-month historical volatility, CMU falls into the very low volatility category
What is CMU 1-month volatility 1-year high?
CMU 1-month volatility reached a 1-year high of 23.87% on May 2, 2025
What is CMU 1-month volatility 1-year low?
CMU 1-month volatility reached a 1-year low of 4.72% on February 20, 2026

3-Month

9.69%

March 25, 2026

Summary

Current Value: As of today, CMU 3-month volatility is 9.69%, up +1.57% on March 25, 2026
Value Category: Based on its current 3-month historical volatility, CMU falls into the very low volatility category
1-Year High: CMU 3-month volatility reached a 1-year high of 14.66% on May 2, 2025
1-Year Low: CMU 3-month volatility reached a 1-year low of 6.54% on March 3, 2026

Performance

CMU Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
3-Month Volatility	Mar 25, 26	9.69%	+1.6%	+24.7%	+17.4%	+19.3%	+23.0%	-28.6%	-44.0%
10-Day Volatility	Mar 25, 26	10.97%	+20.0%	+16.8%	+100.2%	+78.1%	+22.2%	-25.2%	+1.8%
1-Month Volatility	Mar 25, 26	13.49%	-0.1%	+90.8%	+54.0%	+136.3%	+78.0%	-9.8%	+41.1%
1-Year Volatility	Mar 25, 26	10.33%	+0.2%	+4.5%	+3.8%	+3.6%	+19.8%	-37.0%	-38.5%
14-Day RSI	Mar 25, 26	40.53	+22.9%	-39.5%	-21.0%	-29.2%	+12.0%	-13.4%	-7.3%
Beta	Mar 25, 26	0.11	0.0%	+10.0%	+10.0%	0.0%	+22.2%	-47.6%	-62.1%
ATR	Mar 25, 26	$0.04	-2.1%	+8.3%	+55.2%	+51.3%	+36.4%	-6.1%	-28.4%
	Mar 25, 26	$3.54	+0.8%	-2.2%	+1.4%	+0.8%	+1.4%	+12.7%	-19.9%
200-Day SMA	Mar 25, 26	$3.45	+0.0%	+0.7%	+1.6%	+1.6%	-2.8%	+6.7%	-20.4%
50-Day SMA	Mar 25, 26	$3.58	+0.0%	+1.1%	+2.2%	+2.2%	+0.9%	+10.9%	-20.5%

3-Month Volatility History

Date	Value	Change
Mar 26, 2026	9.69%	+19.0%
Dec 31, 2025	8.14%	-20.0%
Dec 31, 2024	10.17%	-41.2%
Dec 31, 2023	17.31%	+8.9%
Dec 31, 2022	15.89%	+55.0%
Dec 31, 2021	10.25%	+18.6%
Dec 31, 2020	8.64%	-24.6%
Dec 31, 2019	11.46%	-4.5%
Dec 31, 2018	12.00%	-29.4%
Dec 31, 2017	17.00%	+15.6%
Dec 31, 2016	14.71%	+7.7%
Dec 31, 2015	13.66%	+25.1%
Dec 31, 2014	10.92%	-20.3%
Dec 31, 2013	13.70%	-13.4%
Dec 31, 2012	15.82%	+4.1%
Dec 31, 2011	15.19%	-45.6%
Dec 31, 2010	27.90%	+35.6%
Dec 31, 2009	20.57%	-76.6%
Dec 31, 2008	87.74%	+494.4%
Dec 31, 2007	14.76%	+37.4%

Date	Value	Change
Dec 31, 2006	10.74%	-1.5%
Dec 31, 2005	10.90%	-19.9%
Dec 31, 2004	13.61%	+33.8%
Dec 31, 2003	10.17%	-35.2%
Dec 31, 2002	15.70%	-5.3%
Dec 31, 2001	16.58%	-36.3%
Dec 31, 2000	26.03%	-14.1%
Dec 31, 1999	30.29%	+36.7%
Dec 31, 1998	22.15%	+107.8%
Dec 31, 1997	10.66%	-49.4%
Dec 31, 1996	21.08%	+0.3%
Dec 31, 1995	21.02%	-29.5%
Dec 31, 1994	29.82%	+69.4%
Dec 31, 1993	17.60%	-22.8%
Dec 31, 1992	22.80%	+4.2%
Dec 31, 1991	21.89%	+14.0%
Dec 31, 1990	19.20%	+10.5%
Dec 31, 1989	17.37%	+12.2%
Dec 31, 1988	15.48%	-55.0%
Dec 31, 1987	34.42%	-

FAQ

What is the current 3-month volatility of CMU?
As of today, CMU 3-month volatility is 9.69%
What 3-month volatility category does CMU fall into?
Based on its current 3-month historical volatility, CMU falls into the very low volatility category
What is CMU 3-month volatility 1-year high?
CMU 3-month volatility reached a 1-year high of 14.66% on May 2, 2025
What is CMU 3-month volatility 1-year low?
CMU 3-month volatility reached a 1-year low of 6.54% on March 3, 2026

1-Year

10.33%

March 25, 2026

Summary

Current Value: As of today, CMU 1-year volatility is 10.33%, up +0.19% on March 25, 2026
Value Category: Based on its current 1-year historical volatility, CMU falls into the very low volatility category
1-Year High: CMU 1-year volatility reached a 1-year high of 10.57% on May 2, 2025
1-Year Low: CMU 1-year volatility reached a 1-year low of 8.58% on April 4, 2025

Performance

CMU Performance
Metric	Date	Value	1D	1M	3M	YTD	1Y	3Y	5Y
1-Year Volatility	Mar 25, 26	10.33%	+0.2%	+4.5%	+3.8%	+3.6%	+19.8%	-37.0%	-38.5%
10-Day Volatility	Mar 25, 26	10.97%	+20.0%	+16.8%	+100.2%	+78.1%	+22.2%	-25.2%	+1.8%
1-Month Volatility	Mar 25, 26	13.49%	-0.1%	+90.8%	+54.0%	+136.3%	+78.0%	-9.8%	+41.1%
3-Month Volatility	Mar 25, 26	9.69%	+1.6%	+24.7%	+17.4%	+19.3%	+23.0%	-28.6%	-44.0%
1-Year Volatility	Mar 25, 26	10.33%	+0.2%	+4.5%	+3.8%	+3.6%	+19.8%	-37.0%	-38.5%
14-Day RSI	Mar 25, 26	40.53	+22.9%	-39.5%	-21.0%	-29.2%	+12.0%	-13.4%	-7.3%
Beta	Mar 25, 26	0.11	0.0%	+10.0%	+10.0%	0.0%	+22.2%	-47.6%	-62.1%
ATR	Mar 25, 26	$0.04	-2.1%	+8.3%	+55.2%	+51.3%	+36.4%	-6.1%	-28.4%
	Mar 25, 26	$3.54	+0.8%	-2.2%	+1.4%	+0.8%	+1.4%	+12.7%	-19.9%
200-Day SMA	Mar 25, 26	$3.45	+0.0%	+0.7%	+1.6%	+1.6%	-2.8%	+6.7%	-20.4%
50-Day SMA	Mar 25, 26	$3.58	+0.0%	+1.1%	+2.2%	+2.2%	+0.9%	+10.9%	-20.5%

1-Year Volatility History

Date	Value	Change
Mar 26, 2026	10.33%	+3.6%
Dec 31, 2025	9.97%	+16.6%
Dec 31, 2024	8.55%	-41.4%
Dec 31, 2023	14.59%	-17.3%
Dec 31, 2022	17.65%	+53.5%
Dec 31, 2021	11.50%	-59.5%
Dec 31, 2020	28.40%	+126.5%
Dec 31, 2019	12.54%	+28.5%
Dec 31, 2018	9.76%	-25.7%
Dec 31, 2017	13.13%	+0.4%
Dec 31, 2016	13.08%	+2.8%
Dec 31, 2015	12.72%	+9.8%
Dec 31, 2014	11.58%	-31.1%
Dec 31, 2013	16.80%	+6.2%
Dec 31, 2012	15.82%	+3.7%
Dec 31, 2011	15.25%	-20.5%
Dec 31, 2010	19.18%	-40.6%
Dec 31, 2009	32.29%	-35.9%
Dec 31, 2008	50.39%	+311.0%
Dec 31, 2007	12.26%	+0.2%

Date	Value	Change
Dec 31, 2006	12.24%	+13.6%
Dec 31, 2005	10.77%	-19.3%
Dec 31, 2004	13.35%	+20.4%
Dec 31, 2003	11.09%	-11.6%
Dec 31, 2002	12.55%	-27.6%
Dec 31, 2001	17.33%	-28.6%
Dec 31, 2000	24.26%	+11.1%
Dec 31, 1999	21.84%	+24.1%
Dec 31, 1998	17.60%	+7.3%
Dec 31, 1997	16.41%	-24.5%
Dec 31, 1996	21.74%	-4.7%
Dec 31, 1995	22.81%	-9.3%
Dec 31, 1994	25.16%	+31.9%
Dec 31, 1993	19.07%	-10.3%
Dec 31, 1992	21.26%	+15.7%
Dec 31, 1991	18.38%	-9.4%
Dec 31, 1990	20.28%	+28.4%
Dec 31, 1989	15.79%	-21.1%
Dec 31, 1988	20.02%	-24.5%
Dec 31, 1987	26.51%	-

FAQ

What is the current 1-year volatility of CMU?
As of today, CMU 1-year volatility is 10.33%
What 1-year volatility category does CMU fall into?
Based on its current 1-year historical volatility, CMU falls into the very low volatility category
What is CMU 1-year volatility 1-year high?
CMU 1-year volatility reached a 1-year high of 10.57% on May 2, 2025
What is CMU 1-year volatility 1-year low?
CMU 1-year volatility reached a 1-year low of 8.58% on April 4, 2025

Data Sources & References

CMU Official Website www.mfs.com/en-us/individual-investor/product-strategies/closed-end-funds/CMU-mfs-high-yield-municipal-trust.html#tab-overview
CMU Profile on Yahoo Finance finance.yahoo.com/quote/CMU
CMU Profile on NASDAQ.com www.nasdaq.com/market-activity/stocks/cmu