William Frels - Mairs & Power Inc
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  Corning Inc. (GLW)
Period Shares % of Portfolio Activity % Change to Portfolio Reported Price Value Filing
2026   Q1 88,250 0.12 Reduce 2.32% <0.01 $135.97 $11,999,353 SEC
2025   Q4 90,350 0.08 Reduce 2.46% <0.01 $87.56 $7,911,046 SEC
2025   Q3 92,626 0.07 Reduce 0.64% <0.01 $82.03 $7,598,111 SEC
2025   Q2 93,220 0.05 Add 4.45% <0.01 $52.59 $4,902,440 SEC
2025   Q1 89,245 0.04 Reduce 3.28% <0.01 $45.78 $4,085,636 SEC
2024   Q4 92,270 0.04 Reduce 6.97% <0.01 $47.52 $4,384,670 SEC
2024   Q3 99,186 0.04 Reduce 7.35% <0.01 $45.15 $4,478,248 SEC
2024   Q2 107,055 0.04 Reduce 14.67% <0.01 $38.85 $4,159,087 SEC
2024   Q1 125,460 0.04 Reduce 23.59% 0.01 $32.96 $4,135,162 SEC
2023   Q4 164,196 0.05 Reduce 14.26% 0.01 $30.45 $4,999,768 SEC
2023   Q3 191,511 0.07 Reduce 13.01% 0.01 $30.47 $5,835,340 SEC
2023   Q2 220,161 0.08 Reduce 22.25% 0.03 $35.04 $7,714,441 SEC
2023   Q1 283,173 0.12 Reduce 15.00% 0.02 $35.28 $9,990,343 SEC
2022   Q4 333,164 0.13 Reduce 4.01% <0.01 $31.94 $10,641,258 SEC
2022   Q3 347,071 0.13 Reduce 0.35% <0.01 $29.02 $10,072,000 SEC
2022   Q2 348,287 0.13 Reduce 17.45% 0.03 $31.51 $10,975,000 SEC
2022   Q1 421,905 0.16 Reduce 75.22% 0.44 $36.91 $15,573,000 SEC
2021   Q4 1,702,469 0.59 Reduce 0.88% <0.01 $37.23 $63,383,000 SEC
2021   Q3 1,717,562 0.63 Add 0.01% <0.01 $36.49 $62,674,000 SEC
2021   Q2 1,717,388 0.69 Reduce 0.54% <0.01 $40.90 $70,241,000 SEC
2021   Q1 1,726,791 0.79 Reduce 1.81% 0.01 $43.51 $75,133,000 SEC
2020   Q4 1,758,686 0.70 Reduce 13.24% 0.11 $36.00 $63,313,000 SEC
2020   Q3 2,027,019 0.82 Reduce 8.16% 0.06 $32.41 $65,696,000 SEC
2020   Q2 2,207,240 0.75 Reduce 8.30% 0.06 $25.90 $57,168,000 SEC
2020   Q1 2,406,939 0.72 Reduce 0.24% <0.01 $20.54 $49,439,000 SEC
2019   Q4 2,412,712 0.80 Reduce 0.85% <0.01 $29.11 $70,234,000 SEC
2019   Q3 2,433,301 0.84 Add 9.17% 0.07 $28.52 $69,398,000 SEC
2019   Q2 2,228,998 0.89 Add 5.71% 0.05 $33.23 $74,070,000 SEC
2019   Q1 2,108,503 0.85 Reduce 0.91% <0.01 $33.10 $69,791,000 SEC
2018   Q4 2,127,806 0.87 Reduce 0.55% <0.01 $30.21 $64,281,000 SEC
2018   Q3 2,139,661 0.88 Reduce 7.95% 0.06 $35.30 $75,530,000 SEC
2018   Q2 2,324,548 0.79 Reduce 1.67% 0.01 $27.51 $63,948,000 SEC
2018   Q1 2,364,095 0.81 Reduce 2.33% 0.02 $27.88 $65,911,000 SEC
2017   Q4 2,420,615 0.90 Reduce 1.63% 0.01 $31.99 $77,435,000 SEC
2017   Q3 2,460,744 0.88 Reduce 3.07% 0.03 $29.92 $73,625,000 SEC
2017   Q2 2,538,634 0.92 Reduce 0.77% <0.01 $30.05 $76,286,000 SEC
2017   Q1 2,558,362 0.85 Reduce 0.13% <0.01 $27.00 $69,076,000 SEC
2016   Q4 2,561,656 0.80 Reduce 10.55% 0.09 $24.27 $62,171,000 SEC
2016   Q3 2,863,726 0.89 Reduce 2.89% 0.02 $23.65 $67,727,000 SEC
2016   Q2 2,948,886 0.82 Reduce 0.72% <0.01 $20.48 $60,393,000 SEC
2016   Q1 2,970,216 0.88 Reduce 0.49% <0.01 $20.89 $62,048,000 SEC
2015   Q4 2,984,882 0.82 Reduce 0.72% <0.01 $18.28 $54,564,000 SEC
2015   Q3 3,006,564 0.80 Reduce 0.27% <0.01 $17.12 $51,472,000 SEC
2015   Q2 3,014,714 0.84 Reduce 0.20% <0.01 $19.73 $59,480,000 SEC
2015   Q1 3,020,879 0.94 Reduce 7.49% 0.08 $22.68 $68,514,000 SEC
2014   Q4 3,265,395 1.04 Reduce 4.17% 0.04 $22.93 $74,876,000 SEC
2014   Q3 3,407,515 0.96 Reduce 4.83% 0.05 $19.34 $65,901,000 SEC
2014   Q2 3,580,460 1.13 Reduce 13.76% 0.18 $21.95 $78,591,000 SEC
2014   Q1 4,151,918 1.34 Reduce 1.34% 0.02 $20.82 $86,443,000 SEC
2013   Q4 4,208,490 1.21 Reduce 0.61% <0.01 $17.82 $74,995,000 SEC
2013   Q3 4,234,160 1.12 Reduce 1.28% 0.02 $14.59 $61,776,000 SEC
2013   Q2 4,289,007 1.22 Add 0.01% <0.01 $14.23 $61,033,000 SEC
2013   Q1 4,288,381 0.58 Add 16.68% 0.08 $13.33 $57,164,000 SEC
2012   Q4 3,675,419 1.16 Add 1.96% 0.02 $12.62 $46,384,000 SEC
2012   Q3 3,604,682 1.17 Add 0.26% <0.01 $13.15 $47,402,000 SEC
2012   Q2 3,595,281 1.21 Add 0.17% <0.01 $12.93 $46,487,000 SEC
2012   Q1 3,589,103 1.30 Add 1.55% 0.02 $14.08 $50,535,000 SEC
2011   Q4 3,534,194 1.32 Add 3.70% 0.05 $12.98 $45,874,000 SEC
2011   Q3 3,408,189 1.36 Buy 1.36 $12.36 $42,125,000 SEC
2011   Q2 0 0.00 Sell 100.00% 1.85 SEC
2011   Q1 3,266,326 1.85 Add 0.35% <0.01 $20.63 $67,384,000 SEC
2010   Q4 3,254,796 1.81 Add 1.43% 0.03 $19.32 $62,883,000 SEC
2010   Q3 3,208,881 0.93 Add 0.96% <0.01 $18,280.00 $58,658,345,000 SEC
2010   Q1 3,178,432 0.97 Reduce 1.04% 0.01 $20,210.00 $64,236,111,000 SEC
2009   Q4 3,211,779 0.98 Add 0.77% <0.01 $19,310.00 $62,019,452,000 SEC
2009   Q3 3,187,242 0.81 Add 2.27% 0.02 $15,310.00 $48,796,675,000 SEC
2009   Q2 3,116,542 0.95 Reduce 0.68% <0.01 $16,060.00 $50,051,665,000 SEC
2009   Q1 3,137,742 0.94 Add 0.67% <0.01 $13,270.00 $41,637,836,000 SEC
2008   Q4 3,116,732 0.57 Add 10.21% 0.05 $9,530.00 $29,702,456,000 SEC
2008   Q3 2,827,972 0.65 Add 10.04% 0.06 $15,640.00 $44,229,482,000 SEC
2008   Q2 2,569,992 0.88 Add 0.06% <0.01 $23,050.00 $59,238,316,000 SEC
2008   Q1 2,568,397 0.85 Add 0.49% <0.01 $24,040.00 $61,744,264,000 SEC
2007   Q4 2,555,997 1.25 Add 1.27% 0.02 $23,990.00 $61,318,368,000 SEC
2007   Q3 2,523,877 0.74 Add 0.43% <0.01 $24,650.00 $62,213,568,000 SEC
2007   Q2 2,512,977 0.78 Add 0.58% <0.01 $25,550.00 $64,206,562,000 SEC
2007   Q1 2,498,427 0.72 Add 1.93% 0.01 $22,740.00 $56,814,230,000 SEC
2006   Q4 2,451,127 0.59 Add 10.07% 0.05 $18,710.00 $45,860,586,000 SEC
2006   Q3 2,226,891 1.49 Reduce 0.43% 0.01 $24,410.00 $54,358,409,000 SEC
2006   Q2 2,236,469 2.71 Add 10.60% 0.26 $24,190.00 $54,100,179,000 SEC
2006   Q1 2,022,149 0.74 Reduce 3.01% 0.02 $26,920.00 $54,436,251,000 SEC
2005   Q4 2,084,849 0.60 Reduce 0.31% <0.01 $19,660.00 $40,988,131,000 SEC
2005   Q3 2,091,299 1.27 Reduce 1.72% <0.01 $19,330.00 $40,424,810,000 SEC
2005   Q2 2,127,899 0.55 Add 0.07% <0.01 $16,620.00 $35,365,681,000 SEC
2005   Q1 2,126,393 0.39 Add 6.78% 0.02 $11,130.00 $23,666,754,000 SEC
2004   Q4 1,991,331 0.42 Buy 0.42 $11,770.00 $23,437,966,000 SEC
2004   Q3 0 0.00 Sell 100.00% 1.15 SEC
2004   Q2 2,001,358 1.15 $13,060.00 $26,137,735,000 SEC
2004   Q1 2,001,358 0.54 Reduce 0.48% <0.01 $11,180.00 $22,375,182,000 SEC
2003   Q4 2,011,015 0.56 Reduce 0.83% <0.01 $10,430.00 $20,974,886,000 SEC
2003   Q3 2,027,815 0.59 Buy 0.59 $9,420.00 $19,102,017,000 SEC
2003   Q2 0 0.00 Sell 100.00% 0.48 SEC
2003   Q1 1,950,550 0.48 Add 0.07% <0.01 $5,840.00 $11,391,212,000 SEC
2002   Q4 1,949,150 0.27 Add 2.48% <0.01 $3,310.00 $6,451,687,000 SEC
2002   Q3 1,902,000 0.14 Add 1.80% <0.01 $1,600.00 $3,043,200,000 SEC
2002   Q2 1,868,300 0.29 Add 59.13% 0.11 $3,550.00 $6,632,465,000 SEC
2002   Q1 1,174,100 0.78 Add 32.07% 0.19 $7,620.00 $8,946,642,000 SEC
2001   Q4 889,000 0.40 Add 3.30% 0.01 $8,920.00 $7,929,880,000 SEC
2001   Q3 860,600 0.43 Add 21.47% 0.08 $8,820.00 $7,590,492,000 SEC
2001   Q2 708,500 1.34 Buy 1.34 $16,710.00 $11,839,035,000 SEC
2001   Q1 0 0.00 Sell 100.00% 0.46 SEC
2000   Q4 149,180 0.46 Add 196.08% 0.30 $52,812.50 $7,878,569,000 SEC
2000   Q3 50,385 0.97 Reduce 9.98% 0.09 $297,000.00 $14,964,345,000 SEC
2000   Q2 55,973 0.95 Buy 0.95 $269,874.99 $15,105,713,000 SEC
2000   Q1 0 0.00 Sell 100.00% 0.69 SEC
1999   Q4 84,898 0.69 Reduce 11.69% 0.05 $128,937.50 $10,946,536,000 SEC
1999   Q3 96,138 0.42 Buy 0.42 $68,562.50 $6,591,462,000 SEC