Latest SEC filings for Costco Wholesale Corporation (COST) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). All data sourced directly from SEC EDGAR — last updated 2026-07-14.
RAIKES JEFFREY S (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.
COSTCO WHOLESALE CORP /NEW filed an 8-K with the SEC reporting a material event. Filing excerpt: XBRL Viewer
DENMAN KENNETH D, listed as Director at COSTCO WHOLESALE CORP /NEW, reported an open-market sale of 885 COST shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
DENMAN KENNETH D filed a Form 144 with the SEC indicating intent to sell COST (COSTCO WHOLESALE CORP /NEW) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.
Callans Patrick J filed a Form 144 with the SEC indicating intent to sell COST (COSTCO WHOLESALE CORP /NEW) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.
Callans Patrick J filed a Form 144 with the SEC indicating intent to sell COST (COSTCO WHOLESALE CORP /NEW) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.
COSTCO WHOLESALE CORP /NEW filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.
COSTCO WHOLESALE CORP /NEW filed an 8-K with the SEC reporting a material event. Filing excerpt: XBRL Viewer
COSTCO WHOLESALE CORP /NEW filed an 8-K with the SEC reporting a material event. Filing excerpt: XBRL Viewer
Frates Caton, listed as Executive Vice President at COSTCO WHOLESALE CORP /NEW, reported an open-market sale of 700 COST shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
Caton Frates filed a Form 144 with the SEC indicating intent to sell COST (COSTCO WHOLESALE CORP /NEW) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.
George Sarah Catherine (Executive Vice President) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.
MILLERCHIP GARY (Executive Vice President) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.
COSTCO WHOLESALE CORP /NEW filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.
Adamo Claudine, listed as Executive Vice President at COSTCO WHOLESALE CORP /NEW, reported an open-market sale of 730 COST shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
Adamo Claudine filed a Form 144 with the SEC indicating intent to sell COST (COSTCO WHOLESALE CORP /NEW) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.
COSTCO WHOLESALE CORP /NEW filed an 8-K with the SEC reporting a material event. Filing excerpt: XBRL Viewer
RAIKES JEFFREY S (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.
Jones Teresa A. (Executive Vice President) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.
Jones Teresa A., listed as Executive Vice President at COSTCO WHOLESALE CORP /NEW, reported an open-market sale of 850 COST shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.
Executives, directors, and large shareholders must report any purchase or sale of COST shares within two business days. Consistent buying by multiple insiders is often read as a confidence signal; large sales may reflect diversification or liquidity needs rather than negative conviction.
Filed when a company affiliate intends to sell restricted or control shares. A Form 144 is a notice of intent, not confirmation — the actual sale is later confirmed via Form 4. It gives investors advance visibility into planned insider selling activity.
The 8-K is an event-driven filing that Costco Wholesale Corporation must submit within four business days of a significant development — including earnings results, mergers, executive changes, credit facility updates, or regulatory actions. Each 8-K item code maps to a specific event type.
The 10-Q (quarterly) and 10-K (annual) are comprehensive reports covering Costco Wholesale Corporation's financial results, risk factors, management discussion, and business operations. The 10-K includes audited financials and is the most complete public disclosure the company makes each year.
View valuation, growth metrics, AI Strong Buy score, demand zones, peer comparison, and more — all on the COST stock analysis page.