| 2018-01-17 | Sale | Costco Wholesale Corporation COST | director | 60,000 0.0137% | $192.06 | $11.52M | +9.33% | |
| 2017-03-24 | Sale | Costco Wholesale Corporation COST | director | 200,000 0.0457% | $166.35 | $33.27M | +6.59% | |
| 2017-03-13 | Sale | Costco Wholesale Corporation COST | director | 34,000 0.0077% | $164.52 | $5.59M | +5.31% | |
| 2016-12-19 | Sale | Costco Wholesale Corporation COST | director | 130,000 0.0297% | $164.07 | $21.33M | +3.32% | |
| 2016-10-07 | Sale | Costco Wholesale Corporation COST | director | 40,228 0.0091% | $149.02 | $5.99M | +11.16% | |
| 2016-01-25 | Sale | Costco Wholesale Corporation COST | director | 88,250 0.0202% | $151.97 | $13.41M | +1.85% | |
| 2015-12-11 | Sale | Costco Wholesale Corporation COST | director | 100,000 0.0227% | $160.00 | $16M | -4.21% | |
| 2014-05-15 | Sale | Costco Wholesale Corporation COST | director | 8,000 0.0018% | $114.76 | $918,080 | +20.78% | |
| 2014-04-15 | Sale | Costco Wholesale Corporation COST | director | 8,000 0.0018% | $112.58 | $900,640 | +14.58% | |
| 2014-03-14 | Sale | Costco Wholesale Corporation COST | director | 8,000 0.0018% | $114.00 | $912,000 | +11.14% | |
| 2014-02-14 | Sale | Costco Wholesale Corporation COST | director | 8,000 0.0018% | $114.99 | $919,920 | +3.52% | |
| 2014-01-15 | Sale | Costco Wholesale Corporation COST | director | 8,000 0.0018% | $116.07 | $928,560 | +2.12% | |
| 2013-12-16 | Sale | Costco Wholesale Corporation COST | director | 16,000 0.0036% | $117.92 | $1.89M | -0.07% | |
| 2013-11-15 | Sale | Costco Wholesale Corporation COST | director | 16,000 0.0036% | $123.66 | $1.98M | -5.18% | |
| 2013-10-15 | Sale | Costco Wholesale Corporation COST | director | 16,000 0.0037% | $115.76 | $1.85M | +1.86% | |
| 2013-09-16 | Sale | Costco Wholesale Corporation COST | director | 16,000 0.0037% | $118.36 | $1.89M | -0.21% | |
| 2013-08-15 | Sale | Costco Wholesale Corporation COST | director | 16,000 0.0037% | $112.56 | $1.8M | +4.16% | |
| 2013-07-15 | Sale | Costco Wholesale Corporation COST | director | 16,000 0.0037% | $115.92 | $1.85M | +0.68% | |
| 2013-06-14 | Sale | Costco Wholesale Corporation COST | director | 16,000 0.0036% | $110.37 | $1.77M | +4.75% | |
| 2013-05-15 | Sale | Costco Wholesale Corporation COST | director | 16,000 0.0036% | $110.86 | $1.77M | +2.69% |