Slack Fund invests in early-stage companies developing services that integrate with or enhance the Slack platform. The fund typically focuses on seed and Series A rounds, with investments ranging from $100,000 to $2 million. Their portfolio spans various sectors, including productivity tools, collaboration software, and enterprise solutions.

Notable portfolio companies include Loom, Lattice, and Nylas. The fund leverages Slack's extensive network and resources to provide portfolio companies with strategic guidance, product integration support, and access to potential customers. Slack Fund's investment philosophy centers on fostering innovation within the Slack ecosystem and supporting startups that align with Slack's mission of improving workplace productivity and communication.