Walmart ranked 1st in the Fortune 500 Companies list in 2018.

Overview of Fortune 500 Companies
The Fortune 500 is an annual list compiled and published by Fortune magazine that ranks the top 500 publicly traded companies in the United States. These companies are ranked based on their total revenue for the fiscal year. The Fortune 500 list serves as a measure of the largest and most influential companies in the country.

Reasons for Walmart's Ranking

1. Revenue: Walmart's revenue played a significant role in its ranking. In 2018, Walmart reported total revenue of $500.3 billion, making it the highest revenue-generating company in the United States. Walmart's massive revenue is a result of its extensive retail operations, with thousands of stores across the country and a strong global presence.

2. Retail Dominance: Walmart's position as the largest retailer in the world gave it a competitive edge in the Fortune 500 ranking. The company's vast retail network includes Walmart stores, Sam's Club warehouses, and e-commerce platforms. Walmart's retail dominance allows it to capture a significant share of consumer spending, contributing to its high revenue.

3. International Operations: Walmart's international operations also played a role in its top ranking. The company operates in multiple countries, including Canada, Mexico, the United Kingdom, and China. Its international expansion has allowed Walmart to tap into new markets and diversify its revenue streams, further boosting its overall revenue.

4. Employment: Walmart is known for being one of the largest employers in the world. The company employs millions of people globally, including a significant number of employees in the United States. Its massive workforce and employment opportunities contribute to its overall economic impact and influence in the business world.

5. Market Value: While the Fortune 500 list is primarily based on revenue, market value can also be a factor. Walmart's market value, which represents the total worth of the company's outstanding shares, is substantial. The company's market value reflects investor confidence and perception of its future growth potential.

Conclusion
Walmart's top ranking in the Fortune 500 Companies list in 2018 can be attributed to its high revenue, dominance in the retail industry, strong international operations, large-scale employment, and significant market value. These factors solidify Walmart's position as a leading company in the United States and highlight its influence on the global business landscape.