# Costco Wholesale (COST): value investors who own it

6 value investors held Costco Wholesale in their Q3 2026 13F, led by Semper Augustus, Markel Group, Gardner Russo & Quinn, Matrix Asset Advisors, Mairs &…

## 13F holders

| Manager | Portfolio | Value | Change | Quarters held |
| --- | --- | --- | --- | --- |
| Semper Augustus | 0.3% | $3.1m | Trimmed -0.4% | 53 |
| Markel Group | 0.3% | $36.6m | Unchanged | 53 |
| Gardner Russo & Quinn | 0.0% | $3.2m | Trimmed -26% | 34 |
| Matrix Asset Advisors | 0.0% | $501k | Unchanged | 15 |
| Mairs & Power | 0.0% | $2.8m | Unchanged | 53 |
| Harris Associates (Oakmark) | 0.0% | $335k | Trimmed -1.1% | 5 |
| Horizon Kinetics | 0.0% | $0k | Sold out | 1 |

## Directors buying and selling (Form 4, last 12 months)

| Date | Who | Role | Bought or sold | Shares | Value |
| --- | --- | --- | --- | --- | --- |
| 2026-10-13 | Wilcox William Richard | Executive Vice President | Sold | 1100 | $1.1m |
| 2026-09-29 | Adamo Claudine | Executive Vice President | Sold | 2200 | $2.0m |
| 2026-09-29 | Frates Caton | Sr. Executive Vice President | Sold | 800.638 | $733k |

Source: SEC filings, via moatshark (https://www.moatshark.com/s/cost). Values traded and returns are estimates. Not investment advice. Built 2026-10-21.