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Costco Wholesale Corporation (COST) SEC Filing (8-K) 2026

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

Last updated: October 15, 2026, 12:02 AM ET
SEC filings
Years
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SEC Filings

Date

2026

4

Insider ownership (buying, selling) activity

Oct 14, 2026 07:00 PM

8-K

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

Oct 14, 2026 04:16 PM

10-K

Annual financial results and management updates

Oct 6, 2026 09:13 PM

4

Insider ownership (buying, selling) activity

Sep 30, 2026 05:52 PM

4

Insider ownership (buying, selling) activity

Sep 30, 2026 05:48 PM

3/A

Corrected or updated initial insider ownership

Sep 30, 2026 05:46 PM

8-K

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

Sep 24, 2026 04:17 PM

4

Insider ownership (buying, selling) activity

Sep 14, 2026 05:20 PM

4

Insider ownership (buying, selling) activity

Sep 14, 2026 05:17 PM

4

Insider ownership (buying, selling) activity

Sep 14, 2026 05:22 PM

4

Insider ownership (buying, selling) activity

Sep 14, 2026 05:23 PM

4

Insider ownership (buying, selling) activity

Sep 14, 2026 05:25 PM

4

Insider ownership (buying, selling) activity

Sep 14, 2026 05:28 PM

4

Insider ownership (buying, selling) activity

Sep 14, 2026 05:30 PM

3

Initial disclosure of insider ownership

Sep 10, 2026 05:48 PM

4

Insider ownership (buying, selling) activity

Jul 14, 2026 04:14 PM

8-K

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

Jul 8, 2026 04:18 PM

11-K

Annual performance report of employee stock plans

Jun 26, 2026 06:16 PM

4

Insider ownership (buying, selling) activity

Jun 25, 2026 04:12 PM

S-3ASR

Automatic shelf registration for eligible issuers

Jun 3, 2026 05:05 PM

SD

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

May 28, 2026 06:45 PM

8-K

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

May 28, 2026 04:17 PM

3/A

Corrected or updated initial insider ownership

May 15, 2026 06:31 PM

SC 13G

Passive large shareholder ownership disclosure

Apr 29, 2026 05:40 PM

8-K

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

Apr 15, 2026 04:16 PM

4

Insider ownership (buying, selling) activity

Apr 1, 2026 06:13 PM

SC 13G/A

Updated passive ownership disclosure

Mar 26, 2026 05:42 PM

4

Insider ownership (buying, selling) activity

Mar 13, 2026 04:10 PM

4

Insider ownership (buying, selling) activity

Mar 13, 2026 04:12 PM

4

Insider ownership (buying, selling) activity

Mar 11, 2026 04:08 PM

10-Q

Quarterly financial results and management updates

Mar 11, 2026 04:37 PM

3

Initial disclosure of insider ownership

Mar 11, 2026 05:06 PM

8-K

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

Mar 5, 2026 04:19 PM

4

Insider ownership (buying, selling) activity

Jan 28, 2026 06:43 PM

4

Insider ownership (buying, selling) activity

Jan 28, 2026 06:46 PM

4

Insider ownership (buying, selling) activity

Jan 23, 2026 04:53 PM

8-K

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

Jan 21, 2026 04:16 PM

3

Initial disclosure of insider ownership

Jan 20, 2026 04:07 PM

4

Insider ownership (buying, selling) activity

Jan 20, 2026 04:12 PM

4

Insider ownership (buying, selling) activity

Jan 20, 2026 04:15 PM

Costco Wholesale Corporation (Form 8-K) 2026

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

Mar 5, 2026 04:19 PM

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