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Costco Wholesale Corp. SEC filings

Costco Wholesale filed 19 documents with the SEC in the last twelve months, the latest report being the 10-K of 7 October 2026. The latest filing, on 16 October 2026, was an 8-K: officer or director change.

Filings in twelve months199 of them 8-K news
Latest report10-Kfiled 7 Oct 2026
Latest filing8-K16 Oct 2026
Last results, two-day move+2.0%results filed 24 Sep 2026
New to this? How to read this page
  1. Companies file with the SEC when something happens. 10-Q and 10-K are the quarterly and annual reports; 8-K is news that cannot wait for the next report.
  2. An 8-K says which items it covers, such as results, a change at the top or a big contract. A foreign company files a 6-K instead.
  3. The results release is usually an 8-K filed the day results come out, before the 10-Q or 10-K.
  4. Every filing links to the original on EDGAR, the SEC's own site.

Twelve months of filings

by kind

Most of the filings were proxy and other (6). Results came out 4 times.

Each mark is one filing on the day it was filed, in rows by kind. Hover or tap a mark for the form and what it was about.

The share price around each results release

close before to close after

Over the last 4 releases the share price moved 2.2% on average in the two days around results, the most on 28 May 2026 (-4.7%).

11 Dec 2025+1.2%$874.41 to $884.47
5 Mar 2026-0.9%$1,006.74 to $998.10
28 May 2026-4.7%$1,003.69 to $956.32
24 Sep 2026+2.0%$904.70 to $922.76
Daily closeResults filed

Each ring marks a results filing. The move runs from the last close before the filing to the first close after it, so it covers results released before the open or after the close. Hover the line for any day's close.

What the company told investors on 8-K

9 filings

Costco Wholesale's 9 news filings (8-K) were mostly about other events (4) and results of operations (4).

  • Other eventsNews the company chose to file
    4 · latest 14 Oct 2026
  • Results of operationsThe quarterly results release
    4 · latest 24 Sep 2026
  • Officer or director changeSomeone joined, left or changed role at the top
    1 · latest 16 Oct 2026
  • Shareholder voteResults of a vote at a shareholder meeting
    1 · latest 21 Jan 2026

Each line is one kind of news, with what it means in plain words. Each square is one filing; a filing can carry more than one kind, so the squares can add up to more than the filings. The date opens the latest one on EDGAR.

How it compares

every company on the site

    The bar ranks every company on the site from the lowest on the left to the highest on the right, in three equal thirds; the small figures under it are the values where each third starts, and the black tick is the middle company. The orange dot is this company; the grey ticks are the other companies in its industry (hover or tap for names). A hatched block is companies tied at none.

    Every filing as a table

    In the last twelve months Costco Wholesale Corp. filed 19 documents with the SEC of the kinds listed here: 9 current reports (8-K), about 4 other events; 4 results of operations; 1 officer or director change; 1 shareholder vote; 3 quarterly reports (10-Q), 1 annual report (10-K), 1 employee plan annual report (11-K), 1 shelf registration (S-3ASR), 1 conflict minerals report (SD), 1 additional proxy material (DEFA14A). The latest, filed 16 October 2026: 8-K, officer or director change. The reports, the proxy statement and the prospectus themselves, where filed, each with a link to open it, are on the documents page.

    FiledFormWhat it was aboutPeriod or event dateFiling
    16 October 20268-KOfficer or director change13 October 2026EDGAR
    14 October 20268-KOther events14 October 2026EDGAR
    7 October 202610-Kannual report30 August 2026EDGAR
    24 September 20268-KResults of operations24 September 2026EDGAR
    8 July 20268-KOther events7 July 2026EDGAR
    29 June 202611-Kemployee plan annual report31 December 2025EDGAR
    3 June 2026S-3ASRshelf registrationEDGAR
    3 June 202610-Qquarterly report10 May 2026EDGAR
    29 May 2026SDconflict minerals reportEDGAR
    28 May 20268-KResults of operations28 May 2026EDGAR
    15 April 20268-KOther events15 April 2026EDGAR
    11 March 202610-Qquarterly report15 February 2026EDGAR
    5 March 20268-KResults of operations5 March 2026EDGAR
    21 January 20268-KShareholder vote, Other events15 January 2026EDGAR
    17 December 202510-Qquarterly report23 November 2025EDGAR
    11 December 20258-KResults of operations11 December 2025EDGAR
    4 December 2025DEFA14Aadditional proxy materialEDGAR
    4 December 2025DEF 14Aproxy statement31 August 2025EDGAR
    4 December 2025ARSannual report to shareholders31 August 2025EDGAR
    An 8-K is what a company files within four business days of a material event; the SEC numbers the events, and the words here are the SEC's own headings, shortened.
    Read moreForm 4, Form 144, 13F and Schedule 13D and 13G have their own pages. Prospectus supplements and correspondence are not listed.