Dudediligence.

Costco Wholesale Corporation

COSTNASDAQ · Retail-Variety Stores
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Last 12 months

Sales planned on beside the trades reported on , and whether each names a .

Planned ·

$19.2M

16 notices · 20,573 sh

Oct 2025 to Oct 2026

Reported ·

$14.5M

12 sales · 0 buys

Oct 2025 to Jun 2026

The two figures cover different periods.

None of the 12 reported sales carry the 10b5-1 box. Together they are under 0.01% of the shares on issue.

PLANNED · FORM 144Oct 2025 to Oct 2026REPORTED · FORM 4Oct 2025 to Jun 2026N2025DJ2026FMAMJJASO2026-09-29: Adamo Claudine, Form 1442026-09-29: Frates Caton, Form 1442026-06-23: DENMAN KENNETH D, Form 1442026-06-12: Callans Patrick J, Form 1442026-06-05: Callans Patrick J, Form 1442026-04-01: Caton Frates, Form 1442026-03-09: Adamo Claudine, Form 1442026-01-21: Jones Teresa A., Form 1442026-01-16: SUSAN L DECKER TRUST, Form 1442026-01-14: Klauer James C, Form 1442026-01-09: THE MILLER FAMILY TRUST, Form 1442025-12-30: POLIT JAVIER, Form 1442025-12-29: POLIT JAVIER, Form 1442025-11-07: Wilcox William Richard, Form 1442025-10-24: Barbre Tiffany Marie, Form 1442025-10-24: Adamo Claudine, Form 1442025-10-24: Adamo Claudine, sold2025-10-24: Barbre Tiffany Marie, sold2025-11-07: Wilcox William Richard, sold2025-12-29: POLIT JAVIER, sold2026-01-09: Miller Russell D, sold2026-01-14: Klauer James C, sold2026-01-16: DECKER SUSAN L, sold2026-01-21: Jones Teresa A., sold2026-03-09: Adamo Claudine, sold2026-04-01: Frates Caton, sold2026-06-23: DENMAN KENNETH D, sold
under a no plan named▼ salesize is dollars

Form 144 notices, newest first

2026-09-29Adamo Claudine, Executive Vice President$2,015,046
2,200 shno plan dateForm 4s on file end Jun 23144 ↗
2026-09-29Frates Caton, Executive Vice President$733,328
801 shno plan dateForm 4s on file end Jun 23144 ↗
2026-06-23DENMAN KENNETH D, Director$847,346
885 shno plan date144 ↗
Form 4, 2026-06-25: sold 885 at $957.45 Form 4 ↗
2026-06-12Callans Patrick J, Executive Vice President$972,848
1,001 shno plan dateForm 4s on file end Jun 23144 ↗
2026-06-05Callans Patrick J, Executive Vice President$995,373
1,000 shno plan dateForm 4s on file end Jun 23144 ↗
2026-04-01Caton Frates, Executive Vice President$689,758
700 shno plan date144 ↗
Form 4, 2026-04-01: sold 700 at $993.00 Form 4 ↗
2026-03-09Adamo Claudine, Executive Vice President$732,205
730 shno plan date144 ↗
Form 4, 2026-03-11: sold 730 at $1003.02 Form 4 ↗
2026-01-21Jones Teresa A., Executive Vice President$838,318
850 shno plan date144 ↗
Form 4, 2026-01-23: sold 850 at $986.26 Form 4 ↗
2026-01-16SUSAN L DECKER TRUST, Director$437,390
458 shno plan date144 ↗
Form 4, 2026-01-20: sold 458 at $955.00 Form 4 ↗
2026-01-14Klauer James C, Executive Vice President$1,408,500
1,500 shno plan date144 ↗
Form 4, 2026-01-15: sold 1,500 at $939.00 Form 4 ↗
2026-01-09THE MILLER FAMILY TRUST, Sr. Executive Vice President$1,374,480
1,500 shno plan date144 ↗
Form 4, 2026-01-12: sold 1,500 at $916.32 Form 4 ↗
2025-12-30POLIT JAVIER, Executive Vice President$481,759
559 shno plan dateno Form 4 on file144 ↗
2025-12-29POLIT JAVIER, Executive Vice President$1,776,904
2,049 shno plan date144 ↗
Form 4, 2025-12-31: sold 2,607 at $866.29 Form 4 ↗
2025-11-07Wilcox William Richard, Executive Vice President$2,232,313
2,400 shno plan date144 ↗
Form 4, 2025-11-12: sold 2,400 at $930.13 Form 4 ↗
2025-10-24Barbre Tiffany Marie, Officer$1,158,353
1,240 shno plan date144 ↗
Form 4, 2025-10-24: sold 1,239 at $934.62 Form 4 ↗
2025-10-24Adamo Claudine, Executive Vice President$2,526,336
2,700 shno plan date144 ↗
Form 4, 2025-10-24: sold 2,700 at $935.68 Form 4 ↗