Company · Ownership research

COSTCO WHOLESALE CORP /NEW COST

CIK 0000909832

Form 4 transactions dated Sep 1, 2023 to Sep 25, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

This page lists 30 of 47 rows; the complete set is available through the API.

Insider filings on file run through 2026-07-14.

Insider purchases & sales

Purchased: $0.00
Sold: $83.08M

Sep 1, 2023 – Jul 14, 2026
Available records · partial months are marked ·

Insiders in this window

202510 of 17 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
2025-12-30	POLIT JAVIER Executive Vice President	Sale	$481.76K 558 shares sold	5.19% sold Direct holding	▾
2025-12-29	POLIT JAVIER Executive Vice President	Sale	$1.78M 2,049 shares sold	16.01% sold Direct holding	▾
2025-11-07	Wilcox William Richard Executive Vice President	Sale	$2.23M 2,400 shares sold	54.55% sold Direct holding	▾
2025-10-24	Barbre Tiffany Marie Principal Accounting Officer	Sale	$1.16M 1,239 shares sold	19.38% sold Direct holding	▾
2025-10-24	Adamo Claudine Executive Vice President	Sale	$2.53M 2,700 shares sold	28.27% sold Direct holding	▾
2025-09-29	Miller Russell D Sr. Executive Vice President	Sale	$3.09M 3,381 shares sold	25.77% sold Trust holding	▾
2025-09-29	Frates Caton Executive Vice President	Sale	$1.40M 1,540 shares sold	14.23% sold Direct holding	▾
2025-08-20	Jones Teresa A. Executive Vice President	Sale	$595.23K 600 shares sold	20.26% sold Direct holding	▾
2025-07-14	Rubanenko Yoram Executive Vice President	Sale	$3.90M 4,000 shares sold	40.92% sold Direct holding	▾
2025-06-18	DECKER SUSAN L Director	Sale	$536.06K 547 shares sold	4.53% sold Direct holding	▾

Showing 17 / 17 record groups in 2025. The complete set is available through the API.

COSTCO WHOLESALE CORP /NEW · COST

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The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. For the year shown, this page lists 17 of 17 purchase / sale groups and 30 of 47 other groups; the totals and the monthly series cover the whole window.

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{"ticker":"COST","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.