Costco Wholesale Corporation (COST) SEC Filings

Browse all Costco Wholesale Corporation SEC filings, including Annual reports (10-K), Quarterly reports (10-Q), 8-K, proxy statements (DEF 14A), and insider filings (Form 4). Access official documents by filing date, reporting period, and form type. ...more

Costco Wholesale Corporation Reports: Annual 10-K, Quarterly 10-Q & SEC Filings

SEC Filings

Date

4

Insider ownership (buying, selling) activity

Jul 14, 2026

8-K

Material company events (earnings, M&A, or leadership changes)

Jul 8, 2026

11-K

Annual performance report of employee stock plans

Jun 29, 2026

4

Insider ownership (buying, selling) activity

Jun 25, 2026

S-3ASR

Automatic shelf registration for eligible issuers

Jun 3, 2026

SD

Specialized disclosure report (e.g., conflict minerals)

May 29, 2026

8-K

Material company events (earnings, M&A, or leadership changes)

May 28, 2026

3/A

Corrected or updated initial insider ownership

May 15, 2026

SC 13G

Passive large shareholder ownership disclosure

Apr 29, 2026

8-K

Material company events (earnings, M&A, or leadership changes)

Apr 15, 2026

4

Insider ownership (buying, selling) activity

Apr 1, 2026

SC 13G/A

Updated passive ownership disclosure

Mar 26, 2026

4

Insider ownership (buying, selling) activity

Mar 13, 2026

4

Insider ownership (buying, selling) activity

Mar 13, 2026

4

Insider ownership (buying, selling) activity

Mar 11, 2026

10-Q

Quarterly financial results and management updates

Mar 11, 2026

3

Initial disclosure of insider ownership

Mar 11, 2026

8-K

Material company events (earnings, M&A, or leadership changes)

Mar 5, 2026

4

Insider ownership (buying, selling) activity

Jan 28, 2026

4

Insider ownership (buying, selling) activity

Jan 28, 2026

4

Insider ownership (buying, selling) activity

Jan 23, 2026

8-K

Material company events (earnings, M&A, or leadership changes)

Jan 21, 2026

4

Insider ownership (buying, selling) activity

Jan 20, 2026

4

Insider ownership (buying, selling) activity

Jan 20, 2026

3

Initial disclosure of insider ownership

Jan 20, 2026

4

Insider ownership (buying, selling) activity

Jan 15, 2026

4

Insider ownership (buying, selling) activity

Jan 12, 2026

4

Insider ownership (buying, selling) activity

Dec 31, 2025

4

Insider ownership (buying, selling) activity

Dec 22, 2025

10-Q

Quarterly financial results and management updates

Dec 17, 2025

4

Insider ownership (buying, selling) activity

Dec 17, 2025

8-K

Material company events (earnings, M&A, or leadership changes)

Dec 11, 2025

DEFA14A

Additional or supplemental proxy disclosures

Dec 4, 2025

DEF 14A

Final shareholder voting details (board elections and executive pay)

Dec 4, 2025

ARS

Annual Report to Shareholders

Dec 4, 2025

4

Insider ownership (buying, selling) activity

Nov 12, 2025

4

Insider ownership (buying, selling) activity

Nov 12, 2025

4

Insider ownership (buying, selling) activity

Oct 24, 2025

4

Insider ownership (buying, selling) activity

Oct 24, 2025

4

Insider ownership (buying, selling) activity

Oct 24, 2025

Costco Wholesale Corporation (Form 4) 2026

Insider Trades / Insider ownership (buying, selling) activity

Jul 14, 2026

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