| 2016-07-26 | Sale | Costco Wholesale Corporation COST | 14,884 0.0034% | $167.10 | $2.49M | -1.15% | ||
| 2016-07-13 | Sale | Costco Wholesale Corporation COST | 12,360 0.0028% | $166.03 | $2.05M | -0.04% | ||
| 2013-04-18 | Sale | Costco Wholesale Corporation COST | director | 51,660 0.012% | $104.63 | $5.41M | +11.63% | |
| 2012-04-27 | Sale | Costco Wholesale Corporation COST | Former Director | 12,000 0.0009% | $30.41 | $364,920 | +13.04% | |
| 2011-05-27 | Sale | Costco Wholesale Corporation COST | Former Director | 12,000 0.0013% | $39.65 | $475,800 | +2.56% | |
| 2010-06-21 | Sale | Costco Wholesale Corporation COST | Former Director | 12,000 0.0017% | $36.19 | $434,250 | +23.47% | |
| 2009-10-09 | Sale | Costco Wholesale Corporation COST | Former Director | 12,000 0.0025% | $52.50 | $630,000 | +1.01% | |
| 2008-06-30 | Sale | Costco Wholesale Corporation COST | Former Director | 16,000 0.0023% | $44.97 | $719,501 | -28.8% | |
| 2007-07-27 | Sale | Costco Wholesale Corporation COST | Former Director | 16,000 0.0017% | $27.13 | $434,000 | +13.59% | |
| 2006-03-16 | Sale | Costco Wholesale Corporation COST | Former Director | 16,000 0.0009% | $14.06 | $225,000 | -1.98% | |
| 2004-10-11 | Sale | Costco Wholesale Corporation COST | Former Director | 16,000 0.0007% | $9.28 | $148,501 | +2.36% |