Costco Review 2026: Is Costco Legit & Safe?
Trust Score: 89/100 (A — Highly Trustworthy)
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Quick Verdict
Costco is one of the most trusted retailers in the world — a NASDAQ-listed Fortune 500 company (ticker COST) operating membership warehouses since 1983 — and is in no way a scam. Its reputation rests on famously low markups, a near-93% U.S. membership renewal rate, and an industry-best return policy with no time limit on most items and a fully refundable membership. You buy from Costco directly (first-party), so counterfeit and seller-fraud risks are minimal. The main caveats are practical, not trust-related: you need a paid membership, the online selection is narrower than Amazon’s, and 2025 lawsuits over web-tracking on its pharmacy pages are worth noting on privacy. For everyday bulk shopping, it is about as safe as retail gets.
Trust Score Breakdown
| Dimension | Score | Notes |
|---|---|---|
| Infrastructure & Security | 18/20 | NASDAQ-listed Fortune 500 company; enterprise infrastructure and secure checkout; operating since 1983. |
| Business Legitimacy | 20/20 | 924 warehouses worldwide and roughly $270B in annual sales; one of the most established retailers on earth. |
| User Feedback | 17/20 | ~93% U.S./Canada membership renewal and consistently top-tier satisfaction surveys; some returns-desk and phone-service gripes. |
| Data Protection | 16/20 | Strong corporate security; 2025 lawsuits allege web-tracking pixels on pharmacy pages shared health data with third parties. |
| Marketplace Factors | 18/20 | Industry-best returns — no time limit on most items, 90 days on electronics; the membership itself is fully refundable anytime. |
Pros
- Industry-leading return policy — no time limit on most items, and a fully refundable membership
- Among the highest customer-satisfaction and membership-renewal rates in retail (~93%)
- First-party retailer with low markups — no third-party-seller or counterfeit risk
- NASDAQ-listed Fortune 500 company operating since 1983
- Strong private-label (Kirkland Signature) quality and value
Cons
- Requires a paid annual membership to shop
- Online selection is narrower than general marketplaces like Amazon
- 2025 lawsuits allege web-tracking on pharmacy pages disclosed health data to third parties
- Some shoppers report unhelpful returns-desk or phone customer service
- Bulk sizing is not ideal for small households
How We Assessed Costco
Rather than rely on a single shopping trip, we assessed Costco across all five Trust Score dimensions using verifiable evidence: we checked its technical footprint (domain, SSL and reputation status), verified the company behind it — a NASDAQ-listed Fortune 500 retailer founded in 1983 operating 924 warehouses — and aggregated independent evidence including its ~93% membership renewal rate, customer-satisfaction surveys, Trustpilot, the Better Business Bureau and public forums. For Costco, we paid particular attention to its industry-best return policy and membership refundability, weighing them against returns-desk and customer-service complaints and the 2025 lawsuits alleging web-tracking on its pharmacy pages. The Trust Score and breakdown above reflect this combined evidence; see our Trust Score methodology for the full rubric and sources.
Is Costco Legit or Safe?
Yes — Costco is unquestionably legit and one of the safest places to shop, online or in person. As a first-party retailer you buy directly from Costco, and its no-time-limit return policy means you are rarely stuck with anything you are unhappy with. The realistic considerations are practical: you need a membership (refundable if you are not satisfied), and if you use the online pharmacy, be aware of the 2025 web-tracking privacy lawsuits. For other large general retailers, compare our Walmart review and Amazon review.
See where Costco ranks in Best Online Marketplaces 2026.
Frequently Asked Questions
Is Costco legit?
Yes. Costco is a legitimate, operating marketplace — not a scam. Atop Legal rates it 89/100 (Grade A, highly trustworthy) using our five-dimension Trust Score methodology covering infrastructure security, business legitimacy, user feedback, data protection and marketplace-specific safeguards.
Is Costco safe to buy from?
Costco is safe for most online purchases. Use the platform's built-in buyer protection, pay on-platform, and check seller ratings before ordering. Our full Trust Score breakdown above explains the rating in detail.
Is Costco a scam?
No. Costco is a real, registered business, not a scam. Like any marketplace it has strengths and weaknesses — which our review documents — but you can shop on it and obtain refunds through its buyer-protection process.
What is Costco's Atop Legal Trust Score?
Costco scores 89 out of 100 (Grade A) in Atop Legal's 2026 assessment. The score is the sum of five 0–20 dimension scores; see the breakdown above and our methodology for how it is calculated.
