Costco Founder Net Worth (Updated 2026).

James D. Sinegal, the founder of Costco Wholesale Corporation, began his career in the retail industry at a young age. Born and raised in Seattle, Washington, Sinegal started working as a stock clerk at a local Safeway store while still in high school. He quickly demonstrated a strong work ethic and dedication to customer service, which caught the attention of his supervisors and led to promotions throughout his early career.

In 1954, Sinegal was offered a management position at a new Safeway store in the Seattle area. He accepted the offer and excelled in his new role, eventually becoming the store’s manager. It was during this time that Sinegal developed his unique approach to retail, focusing on providing high-quality products at competitive prices, and treating employees with respect and fairness. This philosophy would later become the foundation of Costco’s corporate culture and business model.

James Sinegal’s Net Worth in 2025

As of 2025, James Sinegal, the co-founder of Costco, has an estimated net worth of $3.1 billion, according to Forbes. Sinegal’s wealth has grown significantly since his retirement from Costco in 2011, with a substantial portion of his fortune coming from his stake in the company.

Career

James Sinegal co-founded Costco in 1983, serving as the company’s CEO from 1993 to 2011. Under his leadership, Costco grew into one of the world’s largest retailers, known for its low prices and high-quality products. Sinegal was also recognized for his employee-friendly policies, including paying workers above-average wages and providing excellent benefits.

Other Ventures

After retiring from Costco, Sinegal has kept a low profile in terms of new business ventures. However, he has remained involved in the retail industry, serving on the board of directors for several companies, including Nordstrom and Starbucks. Additionally, Sinegal has been an active philanthropist, donating to various causes and supporting education initiatives.

Assets

Sinegal’s primary asset is his 1.2% stake in Costco, which is worth over $2 billion as of 2025. He also owns a significant amount of real estate, including a private island in Washington state and multiple properties in the Seattle area. Additionally, Sinegal has a substantial art collection, featuring works by renowned artists such as Andy Warhol and Roy Lichtenstein.

Annual Income

As of 2025, James Sinegal’s annual income is estimated to be around $10 million. This figure is primarily derived from his Costco stock holdings and dividends. Although Sinegal’s annual income has fluctuated over the years, his wealth has continued to grow steadily due to his Costco stake and strategic investments.

Frequently Asked Questions about  Costco Founder

**Frequently Asked Questions: Costco Founder Net Worth**

1. Who is the founder of Costco?

James “Jim” Sinegal is the co-founder of Costco Wholesale Corporation. He served as the company’s CEO from 1983 to 2012 and as executive chairman until 2016.

2. When was Costco founded?

Costco was founded on September 15, 1983, in Seattle, Washington.

3. What is Jim Sinegal’s net worth?

As of the latest estimates, Jim Sinegal’s net worth is approximately $1.5 billion.

4. How did Jim Sinegal build his wealth?

Jim Sinegal built his wealth through his co-founding and leadership role at Costco. He owned a significant stake in the company, which has grown to become one of the largest retailers in the world.

5. Did Jim Sinegal start Costco alone?

No, Jim Sinegal co-founded Costco with Jeffrey H. Brotman. Brotman served as the company’s chairman from 1983 until his death in 2010.

6. What is Jim Sinegal’s role at Costco now?

Jim Sinegal retired from his executive role at Costco in 2016. He no longer holds a position at the company.

7. What is the total revenue of Costco?

As of the latest fiscal year, Costco’s total revenue was over $163 billion.

8. How many employees does Costco have?

Costco employs over 140,000 full-time and 110,000 part-time employees worldwide.

9. What is the stock symbol for Costco?

The stock symbol for Costco is COST on the NASDAQ stock exchange.

10. What is the mission of Costco?

Costco’s mission is to “provide our members with quality goods and services at the lowest possible prices.”