A Series A Backer is an investor who provides funding to a startup during its Series A round of financing. This round typically follows seed funding and is aimed at helping the startup grow its business, develop products, and expand its market reach. Series A Backers are often venture capitalists or institutional investors who invest significant capital in exchange for equity in the company.
Synonyms: Series A Investor, Series A Financier, Series A Funding Backer, Series A Round Investor

Series A Backers play a crucial role in a startup's growth by providing the necessary capital to scale operations, hire key staff, and improve products. Their investment signals confidence in the startup's potential, which can attract additional investors and partners.
Startups use funds from Series A Backers to move beyond the initial development phase. This funding helps in expanding the team, increasing marketing efforts, and refining the business model to achieve sustainable growth.
Common Series A Backers include venture capital firms like Sequoia Capital, Andreessen Horowitz, and Accel Partners. These investors typically conduct thorough due diligence before investing and often take an active role in advising the startup.