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| 9 Oct 2015 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Sale | 42,493 | $154.01 | $6,544,347 9 Oct 2015 | 107,452 | ↗ |
| 2 Apr 2015 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Sale | 5,936 | $151.65 | $900,194 2 Apr 2015 | 455,495 | ↗ |
| 1 Apr 2015 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Sale | 93,564 | $150.12 | $14,045,828 1 Apr 2015 | 461,431 | ↗ |
| 15 Aug 2014 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Option | 161,445 | $40.69 | $6,569,197 15 Aug 2014 | 275,601 | ↗ |
| 15 Nov 2013 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Sale | 58,946 | $124.33 | $7,328,756 15 Nov 2013 | 102,156 | ↗ |
| 17 Oct 2012 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Option | 150,000 | $37.35 | $5,602,500 17 Oct 2012 | 280,418 | ↗ |
| 21 Jun 2012 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Option | 47,756 | $30.41 | $1,452,260 21 Jun 2012 | 134,251 | ↗ |
| 20 Jun 2012 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Option | 102,244 | $30.41 | $3,109,240 20 Jun 2012 | 188,739 | ↗ |
| 25 Apr 2011 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Option | 150,000 | $39.65 | $5,947,500 25 Apr 2011 | 130,392 | ↗ |
| 23 Jul 2010 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Sale | 50,000 | $55.38 | $2,769,000 23 Jul 2010 | 736,703 | ↗ |
| 28 Dec 2009 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Option | 50,000 | $52.50 | $2,625,000 28 Dec 2009 | 184,335 | ↗ |
| 18 Nov 2009 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Option | 100,000 | $52.50 | $5,250,000 18 Nov 2009 | 234,335 | ↗ |
| 10 Nov 2008 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Option | 100,000 | $36.19 | $3,619,000 10 Nov 2008 | 200,981 | ↗ |
| 30 Oct 2008 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Option | 200,000 | $44.97 | $8,994,000 30 Oct 2008 | 300,981 | ↗ |
| 10 Oct 2008 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Sale | 100,000 | $52.92 | $5,292,000 10 Oct 2008 | 1,186,703 | ↗ |
| 12 Mar 2008 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Option | 200,000 | $27.13 | $5,426,000 12 Mar 2008 | 260,000 | ↗ |
| 21 Dec 2007 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Sale | 100,000 | $69.63 | $6,963,000 21 Dec 2007 | 1,461,703 | ↗ |
| 2 Aug 2007 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Sale | 100,000 | $60.58 | $6,058,000 2 Aug 2007 | 1,561,703 | ↗ |
| 2 Apr 2007 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Sale | 150,000 | $53.55 | $8,032,500 2 Apr 2007 | 1,661,703 | ↗ |
| 20 Mar 2007 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Option | 200,000 | $13.44 | $2,688,000 20 Mar 2007 | 330,225 | ↗ |
| 26 Oct 2006 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Sale | 50,000 | $52.94 | $2,647,000 26 Oct 2006 | 1,811,703 | ↗ |
| 23 Oct 2006 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Sale | 50,000 | $52.27 | $2,613,500 23 Oct 2006 | 1,861,703 | ↗ |
| 20 Oct 2006 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Sale | 50,000 | $51.75 | $2,587,500 20 Oct 2006 | 1,911,703 | ↗ |
| 25 Jan 2006 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Option | 33,300 | $10.69 | $355,977 25 Jan 2006 | 102,275 | ↗ |
| 20 Jan 2006 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Option | 266,700 | $10.69 | $2,851,023 20 Jan 2006 | 335,675 | ↗ |
| 11 Mar 2005 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Option | 100,000 | $6.66 | $666,000 11 Mar 2005 | 262,475 | ↗ |
| 22 Jan 2004 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Sale | 100,000 | $36.45 | $3,645,000 22 Jan 2004 | 2,261,703 | ↗ |
| 20 Oct 2003 | COSTCostco Wholesale Corp | Jeffrey H Brotman Chairman of the Board | Sale | 100,000 | $33.37 | $3,337,000 20 Oct 2003 | 2,361,703 | ↗ |