43

43 is a San Francisco pre-product venture fund that backs founders before they have a product. The firm helps founders navigate the difficult path to product/market fit through conviction, capital, and community. Its investment process is designed for the earliest stage: 43 says it makes a decision within 10 business days and evaluates founders without requiring a prototype, revenue, or pitch slides.

43 offers up to $500,000 as a first check, for up to 10% of a company, to help initiate a financing round. Beyond capital, the fund provides hands-on fundraising guidance, investor introductions, and a direct relationship with both partners, with bespoke support throughout the life of the company. Founders can also access desks at its San Francisco co-working space, where they can build networks with investors, founders, and prospective talent. 43 describes its purpose as helping founders avoid team pitfalls and improve their odds of reaching product/market fit.