James Cox: Biography, Career, and Business Insights

James Cox’s Profile Summary

Company	YYX Capital
Position	Managing Partner and Chief Strategy Officer
Source of wealth	Entrepreneurial ventures (e.g., Simba Sleep), investment returns from YYX Capital and Stonebridge, co-investments with family offices and ultra-high-net-worth individuals.
Also known as	Co-founder of Simba Sleep, Founder of Stonebridge, Investor in consumer internet and e-commerce sectors
Age	Unknown
Education	Specific educational background details for James Cox are not publicly disclosed
Citizenship	British
Residence	London, United Kingdom
Family	Information about James Cox's family is
Website, Social Media	https://uk.linkedin.com/company/yyx-capital

James Cox’s biography

James Cox is a seasoned entrepreneur and investor with a focus on consumer internet and e-commerce sectors. He co-founded Simba Sleep, a direct-to-consumer mattress company, where he served as CEO, leading the company to market leadership with annual revenues exceeding £120 million. In 2015, he co-founded YYX Capital, an investment boutique specializing in early-stage companies, particularly in the consumer internet and e-commerce domains. Under his leadership, YYX Capital has made significant investments, including the acquisition of slipper brand Mahabis in 2019. Additionally, James founded Stonebridge in 2016, a digital-first consumer brand investment firm, further showcasing his commitment to fostering growth in the consumer sector

How did James Cox make money?

James Cox makes money in the following areas:

Entrepreneurial ventures (e.g., Simba Sleep), investment returns from YYX Capital and Stonebridge, co-investments with family offices and ultra-high-net-worth individuals.
What is James Cox net worth?

As of 2025, there is no publicly available and reliable information regarding James Cox’s net worth.

What is James Cox also known as?

James Cox is recognized for co-founding Simba Sleep, a leading direct-to-consumer mattress company that achieved significant market presence under his leadership. He also founded Stonebridge, an investment firm focusing on digital-first consumer brands, demonstrating his expertise in scaling consumer-focused businesses

Prominent achievements of James Cox

Co-founded Simba Sleep, leading it to over £120 million in annual revenues; founded YYX Capital, facilitating significant investments in consumer internet and e-commerce sectors; founded Stonebridge, investing in digital-first consumer brands; led the acquisition of Mahabis, preserving jobs and revitalizing the brand.

What are James Cox’s key insights?

James Cox emphasizes the importance of branding, marketing, and scaling businesses. He believes in aligning interests with clients by co-investing and only profiting upon successful realizations, ensuring a partnership approach to investment.

James Cox’s personal life

Detailed information about James Cox's family is

Useful insights

Leading with purpose and integrity

To achieve long-lasting success, leading with integrity and purpose is crucial. Mary Barra, CEO of General Motors, demonstrates how strong leadership can propel you forward in your career or business.

Define your purpose and align it with your goals

Mary Barra emphasizes the importance of having a clear purpose. Identify your core values and ensure that your actions align with these values. This will give you the clarity and motivation needed to succeed, especially in challenging times.
Adapt to innovation and stay flexible

Barra's success is tied to her ability to guide GM through a transition toward electric vehicles. Always be open to innovation and stay flexible when markets or industries change. Adaptability is a key trait for anyone aiming to succeed.
Empower those around you

Successful leaders know how to empower their teams. By trusting and supporting the people around you, you create a culture of accountability and innovation. Help others succeed, and you’ll find that success naturally follows you as well.