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Costco COST

US equityMarket cap rank #29Discount StoresTop Retailers
$898.13
−$6.58 (-0.73%)
Market open · Sep 24, 1:10 pm ET
After hours $904.60 -0.01%
Open$908.88
Prev close$904.70
Day range$897.33 – $909.43
Volume1.14M
Market cap$398.30B
P/E (TTM)45.2
Dividend yield0.60%

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership73.9%-0.06 pts vs. prior quarter
Institutions holding4,714-14 vs. prior quarter
Insider trades (recent)7 buys / 9 sellsNet selling
Short interest1.71% of floatDays to cover 4.1 · as of 31 Aug 2026
Short-sale volume share12.3%5-day average of daily volume

Short-sale volume as % of daily volume

10%11%13%14%Aug '26Sep '26Sep '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$30.79M (10 inflow days, 10 outflow days).

Largest holders

  • BlackRock7.71%
  • Vanguard Capital Management, LLC7.10%
  • State Street Global Advisors4.15%
  • Invesco Capital Management LLC3.04%
  • Geode Capital Management, LLC2.40%

By investor type

  • Mutual Fund58.88%
  • Public Company5.04%
  • Private Company2.79%
  • Government Pension Fund2.20%
  • Hedge Fund2.07%
  • Sovereign Wealth Fund1.53%
  • Family Office/Trust0.64%
  • Insurance Company0.34%
Institutional holders4,714
Institutional ownership73.9%

Insider activity

Total transactions28
Bought7
Sold9

Short interest

Report dateShares short% of floatDays to cover
31 Aug 2026 7,577,940 1.7% 4.1
14 Aug 2026 7,364,782 1.7% 4.4
31 Jul 2026 7,655,966 1.7% 3.8
15 Jul 2026 6,957,664 1.6% 2.8
30 Jun 2026 7,284,892 1.6% 2.4
15 Jun 2026 7,837,886 1.8% 3.6
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