Costco Wholesale Corp
COST- Exchange
- Nasdaq
- Industry
- Retail-Variety Stores
- SEC CIK
- 0000909832
No open-market purchases or sales by Costco Wholesale Corp insiders were filed in the last 90 days; 4,260 institutions reported holding it in 13F filings for Q2 2026, worth $301.8B in total; 4 superinvestors hold it, including Markel Group and Gardner Russo & Quinn.
Superinvestors holding COST, Q2 2026
4 superinvestors report holding Costco Wholesale Corp on Form 13F, worth $43.3M in total. Weight is Costco Wholesale Corp's share of each 13F portfolio; actions compare shares with Q1 2026.
| Superinvestor | % of portfolio | Shares | Value | vs. previous quarter |
|---|---|---|---|---|
| Markel GroupTom Gayner | 0.3% | 39,150 | $36.6M | Unchanged |
| Gardner Russo & QuinnTom Russo | <0.1% | 3,399 | $3.18M | Reduced−26.5% |
| Semper AugustusChristopher Bloomstran | 0.4% | 3,354 | $3.14M | Reduced−0.4% |
| Harris Associates (Oakmark)Bill Nygren | <0.1% | 358 | $334.9K | Reduced−1.1% |
Moves by quarter
Superinvestors that opened, added to, trimmed or sold out of COST each quarter, comparing shares with the quarter before. A superinvestor that didn't file for a quarter isn't listed, and isn't counted as selling.
Q2 2026
4 superinvestors holding at quarter end
- Reduced
- Gardner Russo & Quinn (−26.5%), Semper Augustus (−0.4%), Harris Associates (Oakmark) (−1.1%)
Q1 2026
4 superinvestors holding at quarter end
- Reduced
- Semper Augustus (−2.3%), Harris Associates (Oakmark) (−44.8%)
- Sold out
- Maverick Capital, Giverny Capital
Q4 2025
6 superinvestors holding at quarter end
- New
- Maverick Capital
- Added
- Semper Augustus (+0.3%), Harris Associates (Oakmark) (+12.9%)
Q3 2025
5 superinvestors holding at quarter end
- Reduced
- Gardner Russo & Quinn (−0.2%), Semper Augustus (−8.8%)
Q2 2025
5 superinvestors holding at quarter end
- New
- Harris Associates (Oakmark)
- Reduced
- Gardner Russo & Quinn (−0.1%), Semper Augustus (−11.2%)
- Sold out
- Maverick Capital
Q1 2025
5 superinvestors holding at quarter end
- Added
- Maverick Capital (+374.6%)
- Reduced
- Gardner Russo & Quinn (−14.1%), Semper Augustus (−2.4%)
Q4 2024
5 superinvestors holding at quarter end
- Added
- Semper Augustus (+0.5%), Maverick Capital (+774.5%)
- Reduced
- Gardner Russo & Quinn (−0.5%)
Q3 2024
5 superinvestors holding at quarter end
- New
- Maverick Capital, Giverny Capital
- Reduced
- Gardner Russo & Quinn (−1.0%)
Q2 2024
3 superinvestors holding at quarter end
- Reduced
- Semper Augustus (−0.6%)
- Sold out
- Maverick Capital
Q1 2024
4 superinvestors holding at quarter end
- New
- Maverick Capital
- Added
- Semper Augustus (+0.3%)
- Reduced
- Gardner Russo & Quinn (−1.3%)
Q4 2023
3 superinvestors holding at quarter end
- Added
- Gardner Russo & Quinn (+7.9%), Semper Augustus (+9.0%)
Q3 2023
3 superinvestors holding at quarter end
- Reduced
- Gardner Russo & Quinn (−1.6%), Semper Augustus (−4.5%)
- Sold out
- Maverick Capital
Q2 2023
4 superinvestors holding at quarter end
- New
- Maverick Capital
- Added
- Gardner Russo & Quinn (+1.9%)
- Reduced
- Semper Augustus (−2.3%)
Q1 2023
3 superinvestors holding at quarter end
- Reduced
- Gardner Russo & Quinn (−4.8%), Semper Augustus (−14.1%)
- Sold out
- Giverny Capital
Q4 2022
4 superinvestors holding at quarter end
- Reduced
- Semper Augustus (−2.9%)
Q3 2022
4 superinvestors holding at quarter end
- Reduced
- Gardner Russo & Quinn (−3.6%)
- Sold out
- Maverick Capital
Q2 2022
5 superinvestors holding at quarter end
- Added
- Maverick Capital (+29.0%)
- Reduced
- Gardner Russo & Quinn (−2.6%), Semper Augustus (−0.9%)
Q1 2022
5 superinvestors holding at quarter end
- New
- Maverick Capital, Giverny Capital
- Added
- Gardner Russo & Quinn (+9.0%)
- Reduced
- Semper Augustus (−6.1%)
Q4 2021
3 superinvestors holding at quarter end
- Reduced
- Semper Augustus (−0.1%)
Q3 2021
3 superinvestors holding at quarter end
- Added
- Gardner Russo & Quinn (+1.9%)
- Reduced
- Semper Augustus (−18.4%)
Q2 2021
3 superinvestors holding at quarter end
- Reduced
- Semper Augustus (−0.1%), Gardner Russo & Quinn (−2.4%)