Warren Buffett - Berkshire Hathaway Inc
Period:    Q1 2026
Portfolio date:    31 Mar 2026
No. of stocks:    29
Portfolio value:    $263,095,703,570
Holdings Activity Buys Sells    History
Holding/activity history for  Iron Mountain Inc. (IRM*)
Period Shares % of Portfolio Activity % Change to Portfolio Reported Price Value Filing
2010   Q3 0 0.00 Sell 100.00% 0.39 SEC
2010   Q2 8,000,000 0.39 Add 2.63% 0.01 $22.46 $179,680,000 SEC
2010   Q1 7,794,800 0.43 Add 11.35% 0.04 $27.40 $213,578,000 SEC
2009   Q4 7,000,000 0.28 Add 107.58% 0.15 $22.76 $159,320,000 SEC
2009   Q3 3,372,200 0.16 $26.66 $89,902,000 SEC
2009   Q2 3,372,200 0.20 $28.75 $96,951,000 SEC
2009   Q1 3,372,200 0.19 $22.17 $74,762,000 SEC
2008   Q4 3,372,200 0.16 $24.73 $83,395,000 SEC
2008   Q3 3,372,200 0.14 $24.41 $82,315,000 SEC
2008   Q2 3,372,200 0.16 $26.55 $89,532,000 SEC
2008   Q1 3,372,200 0.14 Reduce 27.70% 0.07 $26.44 $89,161,000 SEC
2007   Q4 4,663,900 0.26 Reduce 48.45% 0.21 $37.02 $172,658,000 SEC
2007   Q3 9,047,850 0.44 $30.48 $275,778,000 SEC
2007   Q2 9,047,850 0.40 $26.13 $236,420,000 SEC
2007   Q1 9,047,850 0.43 Add 50.00% 0.14 $26.13 $236,420,000 SEC
2006   Q4 6,031,900 0.49 $41.34 $249,359,000 SEC
2006   Q3 6,031,900 0.54 Add 20.04% 0.09 $42.94 $259,010,000 SEC
2006   Q2 5,024,700 0.44 Add 44.25% 0.14 $37.38 $187,823,000 SEC
2006   Q1 3,483,300 0.33 Reduce 11.79% 0.05 $40.74 $141,910,000 SEC
2005   Q4 3,948,800 0.41 Reduce 21.02% 0.12 $42.22 $166,718,000 SEC
2005   Q3 5,000,000 0.58 $36.70 $183,500,000 SEC
2005   Q2 5,000,000 0.47 $31.02 $155,100,000 SEC
2005   Q1 5,000,000 0.44 $28.84 $144,200,000 SEC
2004   Q4 5,000,000 0.46 Reduce 27.91% 0.21 $30.49 $152,450,000 SEC
2004   Q3 6,935,750 0.75 Add 38.20% 0.21 $33.85 $234,775,000 SEC
2004   Q2 5,018,500 0.83 $48.26 $242,193,000 SEC
2004   Q1 5,018,500 0.67 $44.63 $223,976,000 SEC
2003   Q4 5,018,500 0.61 $39.54 $198,431,000 SEC
2003   Q3 5,018,500 0.62 $35.90 $180,164,000 SEC
2003   Q2 5,018,500 15.37 Buy 15.37 $37.09 $186,136,000 SEC
2003   Q1 0 0.00 Sell 100.00% 1.02 SEC
2002   Q4 8,000,000 1.02 Add 19.92% 0.17 $33.01 $264,080,000 SEC
2002   Q3 6,671,200 0.64 Buy 0.64 $24.99 $166,723,000 SEC