Day One Ventures is a venture capital firm founded by Masha Bucher and based in San Francisco, California. The firm invests in early-stage technology companies, with a particular focus on seed and pre-seed stage startups across sectors including consumer technology, enterprise software, fintech, healthcare, and frontier technologies. The firm is known for its emphasis on helping portfolio companies with public relations, media strategy, and brand building in addition to providing capital. The firm has invested in a diversified portfolio of startups and positions itself as a founder-friendly investor that supports entrepreneurs from the earliest stages of company formation. The firm also runs immigration-related programs and has been involved in initiatives to support international founders building companies in the United States.