# Why Costco (COST) moves

Every archived Costco (COST) move, explained the day it happened, with sources.

Source: https://perplo.app/why/COST

- **2026-08-22 · COST (Costco) +1.51%** — Medicare Advantage expansion deepens member moat https://perplo.app/why/COST/2026-08-22.md
- **2026-08-21 · COST (Costco) +1.74%** — Trump beef tariff cut lowers imported cost pressure https://perplo.app/why/COST/2026-08-21.md