LYTIR

Company · COST

Costco Wholesale Corporation

Name as listed on its exchange; filed with the SEC as COSTCO WHOLESALE CORP /NEW.

Nasdaq's symbol directory lists COST on Nasdaq as “Costco Wholesale Corporation - Common Stock”.

In the 12 months to Nov 8, 2026: insiders sold on 4 occasions ($4.6M); 4 planned-sale notices; 9 congressional trade disclosures; 4 company reports (Form 8-K, since May 26, 2026).

All insider filings at the SEC

Insider purchases and sales, by month (last 12 months)Insider purchases: $0 in total; Insider sales: $4.6M in total.Jun: Insider sales $847KSep: Insider sales $2.7MOct: Insider sales $1.1MDecJanFebMarAprMayJunJulAugSepOctNov
Insider purchases above the line: $0Insider sales below: $4.6M
Dollar value of open-market purchases and sales reported on SEC Form 4, by the month traded. Sales include pre-arranged 10b5-1 plan sales.

Insider trades · SEC Form 4

Those inside the hall

Open-market purchases and sales only. Legs one person filed for one day are combined.

Who traded

  1. Adamo Claudine, Executive Vice President sold on 1 day latest Sep 29, 2026 sold $2.0M
  2. Wilcox William Richard, Executive Vice President sold on 1 day latest Oct 13, 2026 sold $1.1M
  3. DENMAN KENNETH D sold on 1 day latest Jun 23, 2026 sold $847K
  4. Frates Caton, Sr. Executive Vice President sold on 1 day latest Sep 29, 2026 sold $733K
Every trade (4)
  1. SELLWilcox William Richard, Executive Vice President sold Oct 13, 2026 1,100 shares filing $1.1M
  2. SELLAdamo Claudine, Executive Vice President sold Sep 29, 2026 2,200 shares filing $2.0M
  3. SELLFrates Caton, Sr. Executive Vice President sold Sep 29, 2026 800 shares filing $733K
  4. SELLDENMAN KENNETH D sold Jun 23, 2026 885 shares filing $847K

Planned sales · SEC Form 144

Notice given

A Form 144 is filed before an insider sells restricted stock. It states an intent; the sale, if it happens, appears later on a Form 4. Every recent notice

  1. Wilcox William Richard filed Oct 13, 2026 Officer 1,100 shares planned sale date 10/13/2026 filing $1.1M
  2. Adamo Claudine filed Sep 29, 2026 Officer 2,200 shares planned sale date 09/29/2026 filing $2.0M
  3. Frates Caton filed Sep 29, 2026 Officer 801 shares planned sale date 09/29/2026 filing $733K
  4. DENMAN KENNETH D filed Jun 23, 2026 Director 885 shares planned sale date 06/23/2026 filing $847K

Congress · STOCK Act

The Althing

Periodic transaction reports. Amounts are the ranges members report; the trade date is when it happened, the report can come up to 45 days later.

  1. Pete Sessions (R-TX17): Sale Oct 13, 2026 reported Oct 27, 2026 one of 31 trades the member reported that day House Stocks (including ADRs) $100,001 - $250,000
  2. Pete Sessions (R-TX17): Sale Oct 2, 2026 reported Oct 27, 2026 one of 31 trades the member reported that day House Stocks (including ADRs) owner: spouse $250,001 - $500,000
  3. Richard W. Allen (R-GA12): Sale Sep 18, 2026 reported Oct 14, 2026 one of 2 trades the member reported that day House Stocks (including ADRs) owner: spouse $1,001 - $15,000
  4. Richard Dean Dr McCormick (R-GA06): Sale Jul 30, 2026 reported Aug 14, 2026 one of 26 trades the member reported that day House Stocks (including ADRs) $1,001 - $15,000
  5. Dan Newhouse (R-WA04): Purchase Jul 10, 2026 reported Jul 17, 2026 one of 31 trades the member reported that day House Stocks (including ADRs) owner: spouse $1,001 - $15,000
  6. Alan Armstrong (R-OK): Purchase Mar 27, 2026 reported Jul 21, 2026 one of 703 trades the member reported that day Senate Stock $1,001 - $15,000
  7. Gilbert Cisneros (D-CA31): Purchase Jan 30, 2026 reported Feb 13, 2026 one of 151 trades the member reported that day House Stocks (including ADRs) $1,001 - $15,000
  8. Markwayne Mullin (R-OK): Purchase Dec 29, 2025 reported Jan 16, 2026 one of 31 trades the member reported that day Senate Stock $15,001 - $50,000
  9. Gilbert Cisneros (D-CA31): Sale Dec 24, 2025 reported Jan 12, 2026 one of 121 trades the member reported that day House Stocks (including ADRs) $1,001 - $15,000

Company reports · SEC Form 8-K

In its own words

Current reports the company filed with the SEC; most items are due within four business days of the event. Each line lists the report's items by the SEC's own titles; the filing says what happened. Reports collected since May 26, 2026; every 8-K at the SEC.

  1. Departure or appointment of directors or officers filing Oct 16, 2026
  2. Other events filing Oct 14, 2026
  3. Results of operations and financial condition filing Sep 24, 2026
  4. Other events filing Jul 8, 2026

Sources: SEC EDGAR (Forms 4, 144 and 8-K) and STOCK Act periodic transaction reports. Filings can be late, amended or wrong at the source; see methodology.