Biggest eCommerce Companies in 2025

When you think about shopping online, a handful of names pop up instantly. Those are the companies that dominate traffic, sales, and innovation. Knowing who they are and why they stay on top can help you spot trends, pick reliable platforms, or even shape your own business ideas.

Who Leads the Market?

At the very top sits Amazon. In 2025 the retailer still pulls in more than $600 billion in revenue, thanks to its massive product catalog, fast shipping, and a growing cloud services wing that funds lower prices. Right behind Amazon is Alibaba Group, the Chinese powerhouse that runs platforms like Taobao and Tmall. Alibaba’s strength is its deep connection to the Asian supply chain and its ability to push billions of items to a global audience.

Next up, Walmart continues to close the gap. The brick‑and‑mortar giant has merged its stores with an aggressive online push, offering grocery delivery, pickup, and a marketplace for third‑party sellers. eBay remains a solid player for used and niche items, while Shopify fuels thousands of independent stores that together account for a noticeable slice of total eCommerce sales.

Other notable names include JD.com in China, Rakuten in Japan, and Mercado Libre in Latin America. Each of these companies tailors its platform to local preferences, but all share a focus on fast logistics, trust signals, and mobile‑first experiences.

What Makes Them Successful?

Speed is king. Customers expect same‑day or next‑day delivery, and the biggest platforms have built fulfilment networks that make that promise realistic. Amazon’s network of fulfilment centers and Alibaba’s Cainiao logistics system are prime examples.

Data drives decisions. These giants track clicks, purchases, and even returns to suggest the right product at the right time. The result is higher conversion rates and repeat business. If you run your own store, start collecting data early – it’s the difference between guessing and knowing.

Marketplace models spread risk. By allowing third‑party sellers, Amazon, Walmart, and eBay boost their product range without holding every item in stock. This also creates a virtuous cycle: more sellers attract more buyers, which attracts more sellers.

Mobile optimisation can’t be an afterthought. Over half of global eCommerce traffic now comes from phones. The leaders invest heavily in apps, responsive design, and smooth checkout flows that reduce friction.

Finally, trust matters. Secure payment options, clear return policies, and genuine customer reviews keep shoppers coming back. The biggest players spend millions on fraud prevention and customer service to protect that trust.

So what can you take away? If you’re a shopper, stick with platforms that offer fast delivery, reliable returns, and clear seller ratings. If you’re an entrepreneur, think about how to build speed, data, and trust into your own site – even if you start small on Shopify or another hosted solution.

Big eCommerce companies won’t disappear overnight, but the playbook they follow is simple: move products fast, use data smartly, let others help fill the shelves, and make buying on a phone as easy as a chat. Keep those four pillars in mind, and you’ll understand why these giants stay on top – and how you can benefit from their success.