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COST · Costco Wholesale Corp /New

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Market Cap
$411.76B
Shares
443.48M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 4,209
Total Value: $316,459,026,618
Total Shares: 338,535,004
Showing 1–100 of 4,312 holdings by value · page 1 of 44

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 4,209 13F filers · Δ vs Mar 31, 2026
Top Holder
10.1%
Sep 2023 → Jun 2026 · range 10.1% – 13.8%
−0.9 pts
Top 5
31.4%
Sep 2023 → Jun 2026 · range 31.4% – 37.0%
−1.3 pts
Top 10
43.5%
Sep 2023 → Jun 2026 · range 43.3% – 46.9%
+0.3 pts
HHI
290
Sep 2023 → Jun 2026 · range 290 – 412
Broadly held−20

Quarterly Activity

vs Mar 31, 2026
New
194
Increased
1,725
Decreased
1,711
Sold Out
258
Unchanged
579
Holder count: -64
Institutional value: +0.4%
Shares held: +7.0%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 4,312
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 909832 CUSIP 22160K105 13F (30d) 1880 filings 1763 filers Visit website Investor relations