A Series A Backer is an investor who provides funding to a startup during its Series A round, which is typically the first significant round of venture capital financing after seed funding. These investors help startups scale their operations, develop products, and expand their market reach.
Synonyms: Series A Investor, Series A Financier, Early-Stage Venture Capitalist, First Round Investor

Series A Backers invest capital in startups that have shown initial promise and need funds to grow. Unlike seed investors who support early ideas, Series A Backers look for startups with a clear business model and some traction, such as user growth or revenue. Their investment helps startups hire key staff, improve technology, and enter new markets.
Series A Backers evaluate startups based on product potential, market size, team strength, and early performance metrics. They often conduct detailed due diligence before investing. These investors usually take equity in the company and may seek a board seat to influence strategic decisions.
Common Series A Backers include venture capital firms specializing in early-stage investments. For example, firms like Sequoia Capital, Andreessen Horowitz, and Accel often lead Series A rounds. Individual investors with venture experience can also act as Series A Backers.