A Series B Investor is an individual or firm that provides funding to a startup during its Series B round of financing. This stage typically occurs after the startup has achieved certain milestones and is looking to expand its market reach, scale operations, and grow the business further.
Synonyms: Series B backer, Series B financier, Series B funding participant, Growth stage investor

Series B Investors play a crucial role in helping startups transition from early-stage companies to more mature businesses. Their investment supports scaling efforts, product development, and market expansion, which are essential for long-term success.
Startups use Series B funding to hire more staff, enhance technology, increase marketing efforts, and enter new markets. Series B Investors provide the capital needed for these growth activities, often bringing valuable expertise and connections.
Typical Series B Investors include venture capital firms, growth equity investors, and sometimes strategic corporate investors. These investors look for startups with proven business models and strong growth potential.