Amazon and Shopify Are Now Half of U.S. E-Commerce

Why It Matters

Their near‑half market share reshapes competitive dynamics, forcing all other retailers into a contested half and prompting strategic realignments across the sector.

Key Takeaways

• Amazon holds ~35.7% U.S. e‑commerce share
• Shopify's U.S. share rose to 14% in 2025
• Combined they control just under 50% of market
• Other retailers split remaining half, intensifying competition
• Shopify's GMV now 66% of Amazon Marketplace

Pulse Analysis

The latest Marketplace Pulse data shows Amazon and Shopify together accounting for 49.7% of U.S. e‑commerce in 2025, a milestone that underscores an unprecedented level of market concentration. Amazon’s $440 billion U.S. sales represent a 35.7% share of the $1.2 trillion total, while Shopify disclosed a 14% share, up from 12% a year earlier. This convergence marks a rapid acceleration from the 43% combined share recorded in 2021, signaling that the two platforms have become the primary infrastructure pillars for online commerce.

Despite their similar aggregate weight, Amazon and Shopify embody opposite architectural philosophies. Amazon operates a centralized marketplace where buyers interact with a single brand, while millions of independent merchants power Shopify’s decentralized storefront network. The growing overlap—Amazon sellers launching direct‑to‑consumer sites and Shopify merchants listing on Amazon—creates a hybrid ecosystem, yet the core distinction remains: Amazon controls the buyer experience, Shopify preserves merchant ownership of customer relationships. This divergence shapes investment decisions, talent allocation, and technology roadmaps across the sector.

The remaining 50% of U.S. e‑commerce is now a crowded battleground for incumbents and challengers. Walmart’s marketplace, still a fraction of Amazon’s volume, remains the only true scale competitor, whereas eBay, TikTok Shop, Temu, and Shein occupy niche or emerging segments. As the two dominant platforms mature, pressure mounts on these players to innovate through omnichannel integration, specialized curation, or price‑leadership strategies. Analysts expect continued consolidation, with smaller platforms either aligning with Amazon or Shopify ecosystems or exiting through acquisition, further entrenching the duopoly.