A Series B Backer is an investor who provides funding to a startup during its Series B financing round. This round typically occurs after the company has shown initial growth and is looking to expand further. Series B Backers usually include venture capital firms and sometimes late-stage investors who help the startup scale its operations, enter new markets, or develop new products.
Synonyms: Series B Investor, Series B Financier, Growth Stage Investor, Startup Series B Backer

Series B Backers invest capital in startups that have moved beyond the early stages and demonstrated potential for significant growth. Their funding helps companies increase their market reach, hire more staff, and improve their technology or product offerings.
At the Series B stage, startups have usually proven their business model but need more resources to grow efficiently. Series B Backers provide the financial support and often strategic guidance necessary to take the company to the next level.
These investors are often venture capital firms with experience in scaling businesses. They look for startups with strong revenue growth, a clear market opportunity, and a solid management team.
What is the difference between a Series A and Series B Backer? Series A Backers invest earlier when the startup is proving its concept, while Series B Backers invest later to help scale the business.
Can individuals be Series B Backers? While mostly venture capital firms participate, some high-net-worth individuals or private equity investors can also be Series B Backers.
What kind of returns do Series B Backers expect? They typically expect higher returns than early-stage investors because the company is less risky but still has significant growth potential.
Do Series B Backers get involved in company decisions? Often, yes. They may take board seats or provide strategic advice to help guide the startup's growth.