William Frels - Mairs & Power Inc

William Frels - Mairs & Power

Period:    Q1 2026
Portfolio date:    31 Mar 2026
No. of stocks:    245
Portfolio value:    $9,786,094,433

Holdings Activity Buys Sells History

Holding/activity history for Mts Sys Corp (MTSC)

Period	Shares	% of Portfolio	Activity	% Change to Portfolio	Price	Value	Filing
2021 Q2	0	0.00	Sell 100.00%	0.02			SEC
2021 Q1	27,500	0.02	Reduce 6.24%	<0.01	$58.22	$1,601,000	SEC
2020 Q4	29,329	0.02	Reduce 4.23%	<0.01	$58.17	$1,706,000	SEC
2020 Q3	30,625	0.01	Reduce 2.55%	<0.01	$19.10	$585,000	SEC
2020 Q2	31,425	0.01	Add 0.48%		$17.60	$553,000	SEC
2020 Q1	31,275	0.01			$22.51	$704,000	SEC
2019 Q4	31,275	0.02	Reduce 2.41%	<0.01	$48.03	$1,502,000	SEC
2019 Q3	32,046	0.02	Add 3.29%	<0.01	$55.26	$1,771,000	SEC
2019 Q2	31,025	0.02	Reduce 4.58%	<0.01	$58.53	$1,816,000	SEC
2019 Q1	32,515	0.02	Add 2.85%	<0.01	$54.47	$1,771,000	SEC
2018 Q4	31,615	0.02	Reduce 8.56%	<0.01	$40.14	$1,269,000	SEC
2018 Q3	34,575	0.02			$54.75	$1,893,000	SEC
2018 Q2	34,575	0.02	Reduce 0.86%	<0.01	$52.64	$1,820,000	SEC
2018 Q1	34,875	0.02	Reduce 21.59%	<0.01	$51.64	$1,801,000	SEC
2017 Q4	44,480	0.03	Reduce 2.39%	<0.01	$53.71	$2,389,000	SEC
2017 Q3	45,570	0.03	Add 7.28%	<0.01	$53.46	$2,436,000	SEC
2017 Q2	42,478	0.03	Reduce 2.75%	<0.01	$51.79	$2,200,000	SEC
2017 Q1	43,678	0.03	Reduce 5.92%	<0.01	$55.04	$2,404,000	SEC
2016 Q4	46,428	0.03	Reduce 4.72%	<0.01	$56.69	$2,632,000	SEC
2016 Q3	48,728	0.03	Reduce 95.92%	0.68	$46.03	$2,243,000	SEC
2016 Q2	1,193,346	0.71	Reduce 6.56%	0.07	$43.84	$52,316,000	SEC
2016 Q1	1,277,076	1.10	Reduce 16.87%	0.25	$60.85	$77,710,000	SEC
2015 Q4	1,536,183	1.46	Reduce 1.25%	0.02	$63.41	$97,409,000	SEC
2015 Q3	1,555,611	1.46	Add 0.06%	<0.01	$60.11	$93,508,000	SEC
2015 Q2	1,554,735	1.52	Reduce 6.05%	0.10	$68.95	$107,199,000	SEC
2015 Q1	1,654,892	1.72	Reduce 0.12%	<0.01	$75.65	$125,193,000	SEC
2014 Q4	1,656,840	1.73	Reduce 1.55%	0.03	$75.03	$124,313,000	SEC
2014 Q3	1,683,003	1.68	Reduce 6.29%	0.11	$68.26	$114,882,000	SEC
2014 Q2	1,795,884	1.75	Add 0.77%	0.01	$67.76	$121,689,000	SEC
2014 Q1	1,782,222	1.89	Add 0.05%	<0.01	$68.49	$122,064,000	SEC
2013 Q4	1,781,382	2.04	Add 0.06%	<0.01	$71.07	$126,603,000	SEC
2013 Q3	1,780,305	2.08	Add 0.42%	<0.01	$64.35	$114,563,000	SEC
2013 Q2	1,772,805	2.01	Reduce 0.79%	<0.01	$56.60	$100,341,000	SEC
2013 Q1	1,786,960	1.06	Add 0.65%	<0.01	$58.15	$103,912,000	SEC
2012 Q4	1,775,375	2.26	Reduce 0.11%	<0.01	$50.93	$90,420,000	SEC
2012 Q3	1,777,324	2.34	Add 0.24%	<0.01	$53.55	$95,176,000	SEC
2012 Q2	1,773,028	1.78	Add 1.39%	0.02	$38.55	$68,350,000	SEC
2012 Q1	1,748,645	2.38	Reduce 1.01%	0.02	$53.09	$92,836,000	SEC
2011 Q4	1,766,438	2.07	Reduce 0.32%	<0.01	$40.75	$71,982,000	SEC
2011 Q3	1,772,049	1.75	Reduce 0.08%	<0.01	$30.64	$54,296,000	SEC
2011 Q2	1,773,444	1.01	Reduce 1.10%	0.02	$41.83	$74,183,000	SEC
2011 Q1	1,793,088	2.24	Reduce 1.10%	0.02	$45.55	$81,675,000	SEC
2010 Q4	1,813,067	1.96	Reduce 0.57%	<0.01	$37.46	$67,918,000	SEC
2010 Q3	1,823,462	0.89	Add 1.15%	0.01	$31,000.00	$56,527,313,000	SEC
2010 Q2	1,802,656	1.80	Add 0.00%		$29,000.00	$52,277,016,000	SEC
2010 Q1	1,802,650	0.79	Reduce 0.56%	<0.01	$29,030.00	$52,330,924,000	SEC
2009 Q4	1,812,744	0.83	Reduce 0.03%	<0.01	$28,740.00	$52,098,263,000	SEC
2009 Q3	1,813,318	0.87	Add 1.17%	0.01	$29,210.00	$52,967,021,000	SEC
2009 Q2	1,792,360	0.70	Add 7.75%	0.05	$20,650.00	$37,012,235,000	SEC
2009 Q1	1,663,453	0.85	Add 3.06%	0.03	$22,749.99	$37,843,546,000	SEC
2008 Q4	1,614,066	0.82	Add 0.49%	<0.01	$26,640.01	$42,998,729,000	SEC
2008 Q3	1,606,187	0.99	Reduce 4.65%	0.04	$42,100.01	$67,620,488,000	SEC
2008 Q2	1,684,483	0.90	Add 1.08%	<0.01	$35,880.00	$60,439,243,000	SEC
2008 Q1	1,666,460	0.74	Add 2.34%	0.02	$32,260.00	$53,760,000,000	SEC
2007 Q4	1,628,285	1.41	Add 0.01%	<0.01	$42.67	$69,478,921	SEC
2007 Q3	1,628,185	0.81	Add 0.03%	<0.01	$41,600.00	$67,732,496,000	SEC
2007 Q2	1,627,680	0.88	Reduce 2.76%	0.02	$44.67	$72,708,466	SEC
2007 Q1	1,673,880	0.83	Reduce 1.56%	0.01	$38.84	$65,013,499	SEC
2006 Q4	1,700,380	0.84	Add 1.15%	<0.01	$38.62	$65,668,676	SEC
2006 Q3	1,680,980	1.49	Reduce 2.65%	0.05	$32.34	$54,362,893	SEC
2006 Q2	1,726,826	1.75	Add 3.52%	0.06	$39.51	$68,226,892	SEC
2006 Q1	1,668,059	0.95	Reduce 3.05%	0.03	$41.83	$69,774,911	SEC
2005 Q4	1,720,456	0.86	Reduce 0.95%	0.02	$34.58	$59,493,369	SEC
2005 Q3	1,736,903	2.05	Reduce 7.85%	0.08	$37.77	$65,602,836	SEC
2005 Q2	1,884,801	0.99	Add 5.78%	0.05	$33.58	$63,291,611	SEC
2005 Q1	1,781,798	0.86	Add 6.98%	0.06	$29.03	$51,725,592	SEC
2004 Q4	1,665,613	1.01	Reduce 2.96%	0.05	$33.81	$56,314,386	SEC
2004 Q3	1,716,464	1.56	Add 7.66%	0.11	$21.25	$36,474,870	SEC
2004 Q2	1,594,300	1.64	Reduce 0.56%	<0.01	$23.45	$37,386,335	SEC
2004 Q1	1,603,200	1.07	Reduce 9.10%	0.08	$27.77	$44,520,864	SEC
2003 Q4	1,763,700	0.91	Reduce 1.02%	<0.01	$19.23	$33,915,951	SEC
2003 Q3	1,781,900	0.84	Reduce 0.70%	0.01	$15.24	$27,156,156	SEC
2003 Q2	1,794,400	1.81	Reduce 0.04%	<0.01	$14.74	$26,449,456	SEC
2003 Q1	1,795,100	0.81	Reduce 0.06%	<0.01	$10.80	$19,387,080	SEC
2002 Q4	1,796,100	0.76	Add 0.11%	<0.01	$10.02	$17,996,922	SEC
2002 Q3	1,794,100	0.80	Reduce 0.28%	<0.01	$9.47	$16,988,333	SEC
2002 Q2	1,799,100	1.00	Add 9.18%	0.08	$12.55	$22,578,705	SEC
2002 Q1	1,647,800	1.57	Add 2.36%	0.04	$10.95	$18,043,410	SEC
2001 Q4	1,609,800	0.81			$10.11	$16,275,078	SEC
2001 Q3	1,609,800	1.05	Reduce 3.42%	0.09	$11.50	$18,512,700	SEC
2001 Q2	1,666,800	2.60	Reduce 4.56%	0.04	$13.79	$22,985,172	SEC
2001 Q1	1,746,500	0.97	Add 0.23%	<0.01	$9.09	$15,882,234	SEC
2000 Q4	1,742,500	0.73	Reduce 0.43%	<0.01	$7.25	$12,633,125	SEC
2000 Q3	1,750,014	0.80	Add 0.03%	<0.01	$7.00	$12,250,098	SEC
2000 Q2	1,749,514	0.69	Add 1.45%	<0.01	$6.25	$10,934,462	SEC
2000 Q1	1,724,514	1.74	Add 0.41%	<0.01	$7.62	$13,149,419	SEC
1999 Q4	1,717,514	0.84	Add 0.26%	<0.01	$7.75	$13,310,733	SEC
1999 Q3	1,713,000	1.12	Buy	1.12	$10.38	$17,772,375	SEC