| Jan 25, 2018 GJForm 5 → | Oct 1, 2:58 pm EDT | COSTCO WHOLESALE CORP /NEWCOST | 63,165 | — | — | 631,854 | — | plan? |
| Jan 17, 2018 SForm 4 → | Jan 19, 11:33 am EST | COSTCO WHOLESALE CORP /NEWCOST | 30,000 | $192.06 | $5,761,758 | 695,019 | −4.14% | plan? |
| Oct 22, 2017 AForm 4/A → | Oct 27, 4:56 pm EDT | COSTCO WHOLESALE CORP /NEWCOST | 1,680 | — | — | 741,545 | — | plan? |
| Oct 10, 2017 AGForm 4 → | Oct 24, 6:20 pm EDT | COSTCO WHOLESALE CORP /NEWCOST | 4,261 | — | — | 741,735 | — | plan? late |
| Sep 19, 2017 GJForm 4 → | Jan 19, 2018, 11:33 am EST | COSTCO WHOLESALE CORP /NEWCOST | 28,385 | — | — | 584,507 | — | plan? late |
| May 24, 2017 AForm 4 → | May 25, 9:48 pm EDT | COSTCO WHOLESALE CORP /NEWCOST | 140 | $173.01 | $24,221 | 717,436 | — | plan? |
| Apr 20, 2017 GJForm 5 → | Oct 12, 11:44 am EDT | COSTCO WHOLESALE CORP /NEWCOST | 62,063 | — | — | 588,460 | — | plan? |
| Mar 24, 2017 SForm 4 → | Mar 27, 10:44 am EDT | COSTCO WHOLESALE CORP /NEWCOST | 100,000 | $166.35 | $16,635,300 | 617,421 | −13.9% | plan? |
| Mar 13, 2017 SForm 4 → | Mar 13, 3:53 pm EDT | COSTCO WHOLESALE CORP /NEWCOST | 17,000 | $164.52 | $2,796,772 | 767,296 | −2.17% | plan? |
| Dec 19, 2016 SForm 4 → | Jan 9, 2017, 11:27 am EST | COSTCO WHOLESALE CORP /NEWCOST | 65,000 | $164.07 | $10,664,375 | 691,879 | −8.59% | plan? late |
| Dec 16, 2016 GForm 4 → | Jan 9, 2017, 11:27 am EST | COSTCO WHOLESALE CORP /NEWCOST | 8,800 | — | — | 761,518 | — | plan? late |
| Oct 22, 2016 AForm 4 → | Oct 24, 2:50 pm EDT | COSTCO WHOLESALE CORP /NEWCOST | 2,182 | — | — | 770,318 | — | plan? |
| Oct 7, 2016 SForm 4/A → | Feb 1, 2017, 12:11 pm EST | COSTCO WHOLESALE CORP /NEWCOST | 20,114 | $149.02 | $2,997,416 | 732,421 | −2.67% | plan? |
| Oct 7, 2016 SForm 4 → | Oct 11, 10:02 am EDT | COSTCO WHOLESALE CORP /NEWCOST | 20,114 | $149.02 | $2,997,416 | 768,136 | −2.55% | plan? amended |
| Oct 4, 2016 GJForm 4 → | Mar 13, 2017, 3:53 pm EDT | COSTCO WHOLESALE CORP /NEWCOST | 10,368 | — | — | 752,535 | — | plan? late |
| Jan 25, 2016 SForm 4 → | Jan 26, 12:01 pm EST | COSTCO WHOLESALE CORP /NEWCOST | 44,125 | $151.97 | $6,705,831 | 804,419 | −5.20% | plan? |
| Dec 11, 2015 SForm 4 → | Dec 11, 5:27 pm EST | COSTCO WHOLESALE CORP /NEWCOST | 50,000 | $160.00 | $8,000,145 | 848,544 | −5.56% | plan? |
| Dec 10, 2015 GJForm 5 → | Sep 29, 2016, 10:53 am EDT | COSTCO WHOLESALE CORP /NEWCOST | 157,586 | — | — | 756,879 | — | plan? |
| Oct 22, 2015 AForm 4 → | Oct 26, 6:58 pm EDT | COSTCO WHOLESALE CORP /NEWCOST | 2,150 | — | — | 898,544 | — | plan? |
| Feb 27, 2015 AForm 4 → | Mar 3, 6:29 pm EST | COSTCO WHOLESALE CORP /NEWCOST | 185 | $146.96 | $27,188 | 889,590 | — | plan? |
| Oct 17, 2014 GJForm 5 → | Oct 13, 2015, 12:14 pm EDT | COSTCO WHOLESALE CORP /NEWCOST | 18,386 | — | — | 804,018 | — | plan? |