Biography

Jim Sinegal is an American businessman best known as the co-founder and former CEO of Costco Wholesale Corporation, one of the world’s leading membership-based retail companies. He co-founded Costco in 1983 with businessman Jeff Brotman and helped develop its distinctive business model: selling quality products in bulk at competitive prices while keeping operating costs under control.

Sinegal became widely respected for his hands-on leadership, practical management style, and commitment to employee benefits. Unlike many major corporate executives, he was known for keeping his salary relatively modest and focusing on long-term business growth. He served as Costco’s president and CEO until retiring from the CEO position in 2012 and later left the company’s board in 2018.

His fortune is generally linked to his long career in retail, his founding role at Costco, executive compensation, and potential investments. However, his exact personal assets are not publicly established, so reported net-worth figures should be treated as estimates.

Category	Details
Full Name	James D. Sinegal
Popular Name	Jim Sinegal
Date of Birth	January 1, 1936
Age	90 years old in 2026
Birthplace	Pittsburgh, Pennsylvania, United States
Nationality	American
Profession	Businessman, Retail Executive
Known For	Co-founding Costco
Education	San Diego City College and San Diego State University
Spouse	Janet Sinegal
Children	Three
Estimated Net Worth	Approximately $1 billion, according to one widely cited estimate
Former Position	Co-founder and former CEO of Costco

Jim Sinegal Net Worth

As of 2026, Jim Sinegal’s net worth is commonly estimated at around $1 billion, according to Celebrity Net Worth. Other online estimates vary, with some placing his wealth higher. Because his complete investment portfolio, private assets, and any holdings held through trusts are not publicly confirmed, no exact figure can be independently verified.

The biggest factor behind Sinegal’s wealth is his role in building Costco into a major international retailer. The company’s expansion, stock-market performance, and his executive career all contributed to his financial success.

Category	Details
Estimated Net Worth	Around $1 billion
Main Source of Wealth	Costco co-founder and former CEO
Industry	Retail and wholesale
Business Founded	Costco, in 1983
Former Annual Base Salary	Reported at approximately $350,000
Other Potential Income Sources	Investments and assets accumulated during his career

Career

Early Career in Retail

Jim Sinegal began his career in retail as a young man working in grocery stores. His early experience gave him a practical understanding of store operations, product pricing, inventory, and customer service.

He later joined FedMart, a discount retailer founded by Sol Price. Sinegal gradually advanced into management and developed expertise in merchandising and retail operations. Working under Price helped him understand the warehouse-club concept, which would become central to Costco’s business model.

Sinegal also held positions at other retail businesses, including Builders Emporium and the Price Company. These roles prepared him to launch a new retail venture built around bulk purchases, membership fees, and low prices.

Co-Founding Costco

Sinegal and Seattle businessman Jeff Brotman founded Costco in 1983. Their goal was to offer members a carefully selected range of products at competitive prices by operating large warehouses with relatively low overhead.

The model proved successful. Customers could purchase groceries, electronics, household goods, clothing, and other products in bulk, while Costco used membership revenue and efficient operations to support its business.

Costco later combined operations with Price Club, the warehouse retailer associated with Sol Price. The businesses went through several corporate changes before Costco Wholesale emerged as the recognizable company it is today.

Becoming Costco’s CEO

Sinegal served as Costco’s president and chief executive officer for many years. During his leadership, the company expanded across the United States and internationally, becoming a major competitor in the retail industry.

He was known for visiting warehouses personally and paying close attention to how stores operated. He also believed that competitive employee wages and benefits could help improve staff retention, customer service, and productivity.

This approach distinguished Costco from many retailers that focused primarily on reducing labor costs. Sinegal argued that treating employees well was compatible with offering customers good value.

Retirement and Business Legacy

Sinegal stepped down as CEO in 2012, with longtime Costco executive Craig Jelinek succeeding him. He remained associated with the company as a director until retiring from its board in 2018.

Although he no longer leads Costco, Sinegal remains an influential figure in modern retail. His career helped demonstrate that a large retailer could compete on low prices while maintaining a strong focus on employees and customer loyalty.

Personal Life

Jim Sinegal has generally maintained a relatively private personal life compared with many other wealthy business figures. He is married to Janet Sinegal, whom he met while attending San Diego State University, and they have three children.

His public reputation has been shaped more by his approach to business than by celebrity or luxury. Sinegal has often been associated with frugality and a preference for practical decision-making. He has also been involved in public and civic matters, including efforts connected to Seattle’s professional sports community.

Category	Details
Marital Status	Married
Wife	Janet Sinegal
Children	Three
Education	San Diego City College and San Diego State University
Known Personal Traits	Practical, frugal, and hands-on
Public Recognition	Retail leadership and employee-focused management

Jim Sinegal Real Estate

Jim Sinegal’s real estate holdings are not comprehensively documented in public sources. Some biographical accounts have reported that he and his family live in a waterfront home in the Lake Washington area, but detailed information about his current property portfolio and its value is not reliably established.

It is important to distinguish Sinegal’s personal real estate from Costco’s warehouses, distribution centers, and other corporate properties. Costco’s business assets belong to the company and should not be counted as his personal wealth.

Without verified property records that clearly establish ownership and value, assigning a specific dollar amount to Sinegal’s real estate would be speculative.

Conclusion

Jim Sinegal built his reputation and fortune through decades of work in retail and his role in co-founding Costco. Beginning with early grocery-store experience, he developed the management skills that helped turn a warehouse-club concept into a global retail business.

His estimated net worth is around $1 billion according to one widely cited source, although his exact wealth remains uncertain. Beyond money, Sinegal’s legacy is his emphasis on low prices, efficient operations, and treating employees fairly. His leadership helped establish Costco as one of the most recognizable names in wholesale retail.

Frequently Asked Questions (FAQs)

1. What is Jim Sinegal’s net worth in 2026?

Jim Sinegal’s net worth is commonly estimated at approximately $1 billion. This is an estimate, not a confirmed disclosure of all his assets.

2. Who is Jim Sinegal?

Jim Sinegal is an American businessman who co-founded Costco Wholesale Corporation with Jeff Brotman in 1983.

3. How did Jim Sinegal make his money?

He built his wealth primarily through his career as a retail executive, his founding role at Costco, executive compensation, and potential investments.

4. Was Jim Sinegal the CEO of Costco?

Yes. Sinegal served as Costco’s president and CEO before stepping down as CEO in 2012. He retired from the company’s board in 2018.

5. Who is Jim Sinegal’s wife?

Jim Sinegal is married to Janet Sinegal. They have three children.

6. Is Jim Sinegal still involved with Costco?

He retired from Costco’s board in 2018 and no longer serves as its CEO. He is best known today for his legacy as a co-founder and former leader of the company.