| 2019-10-30 | Sale | Costco Wholesale Corporation COST | director | 1,703 0.0004% | $298.25 | $507,914 | +3.17% | |
| 2018-10-25 | Sale | Costco Wholesale Corporation COST | director | 4,098 0.0009% | $224.00 | $917,952 | +8.5% | |
| 2017-12-18 | Sale | Costco Wholesale Corporation COST | director | 40,000 0.0091% | $193.03 | $7.72M | +8.3% | |
| 2017-10-24 | Sale | Costco Wholesale Corporation COST | director | 4,700 0.0011% | $162.00 | $761,400 | +21.46% | |
| 2016-10-25 | Sale | Costco Wholesale Corporation COST | director | 4,770 0.0011% | $151.00 | $720,270 | +10.71% | |
| 2015-10-26 | Sale | Costco Wholesale Corporation COST | director | 5,580 0.0013% | $154.00 | $859,320 | -1.26% | |
| 2015-10-23 | Sale | Costco Wholesale Corporation COST | director | 10,000 0.0023% | $155.50 | $1.56M | -0.55% | |
| 2014-10-24 | Sale | Costco Wholesale Corporation COST | director | 41,778 0.0095% | $129.67 | $5.42M | +14.88% | |
| 2013-10-28 | Sale | Costco Wholesale Corporation COST | director | 22,752 0.0052% | $116.65 | $2.65M | +0.65% | |
| 2013-10-24 | Sale | Costco Wholesale Corporation COST | director | 19,582 0.0045% | $116.67 | $2.28M | +1.55% | |
| 2012-12-20 | Sale | Costco Wholesale Corporation COST | Director Emeritus | 6,000 0.0014% | $99.00 | $594,027 | +13.35% | |
| 2012-10-24 | Sale | Costco Wholesale Corporation COST | Director Emeritus | 19,667 0.0045% | $94.83 | $1.86M | +22.21% | |
| 2011-04-11 | Sale | Costco Wholesale Corporation COST | Director Emeritus | 7,525 0.0017% | $76.16 | $573,104 | +8.29% | |
| 2006-03-29 | Sale | Costco Wholesale Corporation COST | Director Emeritus | 19,000 0.004% | $54.54 | $1.04M | -1.44% | |
| 2004-04-16 | Sale | Costco Wholesale Corporation COST | Director Emeritus | 38,770 0.0084% | $38.03 | $1.47M | +17.03% | |
| 2004-04-06 | Sale | Costco Wholesale Corporation COST | Director Emeritus | 34,230 0.0074% | $38.03 | $1.3M | +14.32% | |
| 2003-04-06 | Sale | Costco Wholesale Corporation COST | Director Emeritus | 34,230 0.009% | $38.03 | $1.3M |