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  Merck & Co (MRKC)
← All MRKC superinvestors
Period Shares % of Portfolio Activity % Change to Portfolio Price Value Filing
2009   Q4 0 0.00 Sell 100.00% 0.07 SEC
2009   Q3 138,885 0.07 Add 1.05% <0.01 $31,630.00 $4,392,933,000 SEC
2009   Q2 137,445 0.07 $27,960.00 $3,842,962,000 SEC
2009   Q1 137,445 0.08 Reduce 26.26% 0.02 $26,750.00 $3,676,654,000 SEC
2008   Q4 186,395 0.09 Add 23.64% 0.02 $25,971.56 $4,840,968,000 SEC
2008   Q3 150,753 0.07 Add 0.33% <0.01 $31,560.00 $4,757,765,000 SEC
2008   Q2 150,253 0.08 Add 2.95% <0.01 $37,690.00 $5,663,036,000 SEC
2008   Q1 145,953 0.08 Reduce 0.58% <0.01 $37,950.00 $5,538,916,000 SEC
2007   Q4 146,803 0.17 Add 0.21% <0.01 $58.11 $8,530,722 SEC
2007   Q3 146,498 0.09 Add 0.22% <0.01 $51,690.00 $7,572,482,000 SEC
2007   Q2 146,173 0.09 Reduce 2.32% <0.01 $49.80 $7,279,415 SEC
2007   Q1 149,648 0.08 Reduce 4.97% <0.01 $44.17 $6,609,952 SEC
2006   Q4 157,473 0.09 Reduce 5.39% 0.01 $43.60 $6,865,823 SEC
2006   Q3 166,453 0.19 Reduce 60.77% 0.24 $41.90 $6,974,381 SEC
2006   Q2 424,303 0.40 Reduce 38.56% 0.13 $36.43 $15,457,347 SEC
2006   Q1 690,547 0.33 Reduce 18.69% 0.07 $35.23 $24,327,960 SEC
2005   Q4 849,303 0.39 Reduce 3.90% 0.03 $31.81 $27,016,319 SEC
2005   Q3 883,767 0.75 Add 0.11% <0.01 $27.21 $24,047,292 SEC
2005   Q2 882,816 0.43 Add 1.02% <0.01 $30.80 $27,190,724 SEC
2005   Q1 873,936 0.47 Add 3.11% 0.01 $32.37 $28,289,299 SEC
2004   Q4 847,536 0.49 Add 5.48% 0.03 $32.14 $27,239,797 SEC
2004   Q3 803,506 1.14 Add 0.44% <0.01 $33.00 $26,515,688 SEC
2004   Q2 799,990 1.67 Add 0.60% 0.01 $47.50 $37,999,511 SEC
2004   Q1 795,190 0.84 Add 3.92% 0.03 $44.19 $35,139,433 SEC
2003   Q4 765,213 0.95 Add 6.12% 0.05 $46.20 $35,352,827 SEC
2003   Q3 721,113 1.13 Add 21.16% 0.20 $50.62 $36,502,725 SEC
2003   Q2 595,154 2.47 Add 16.48% 0.35 $60.55 $36,036,557 SEC
2003   Q1 510,968 1.17 Reduce 0.12% <0.01 $54.78 $27,990,811 SEC
2002   Q4 511,568 1.22 Add 2.83% 0.03 $56.61 $28,959,848 SEC
2002   Q3 497,483 1.07 Add 8.07% 0.08 $45.71 $22,739,934 SEC
2002   Q2 460,333 1.03 Add 26.50% 0.22 $50.64 $23,311,248 SEC
2002   Q1 363,908 1.83 Add 38.36% 0.51 $57.58 $20,953,805 SEC
2001   Q4 263,008 0.77 Add 19.46% 0.13 $58.80 $15,464,853 SEC
2001   Q3 220,157 0.84 Add 494.83% 0.70 $66.60 $14,662,456 SEC
2001   Q2 37,012 0.27 Add 22.63% 0.05 $63.91 $2,365,437 SEC
2001   Q1 30,182 0.14 Add 0.57% <0.01 $75.90 $2,290,814 SEC
2000   Q4 30,012 0.16 $93.63 $2,809,874 SEC
2000   Q3 30,012 0.15 Reduce 10.18% 0.02 $74.44 $2,234,018 SEC
2000   Q2 33,412 0.16 Add 3.24% <0.01 $76.62 $2,560,194 SEC
2000   Q1 32,362 0.27 Add 3.19% <0.01 $62.12 $2,010,489 SEC
1999   Q4 31,362 0.13 Add 0.16% <0.01 $67.19 $2,107,134 SEC
1999   Q3 31,312 0.13 Buy 0.13 $64.81 $2,029,409 SEC