In a remarkable feat, Jack Altman, co-founder of the HR software company Lattice, has raised a $275 million early-stage fund for his venture capital firm, Alt Capital, in just one week. This new fund represents a substantial increase from his first fund, which was $150 million and raised in early 2024. Altman has utilized his previous fund to invest in around 20 early-stage companies, including notable startups like David AI and Owner.com. Despite stepping down as CEO of Lattice in 2024, he remains actively involved as chairman. His brother, Sam Altman, is the CEO of OpenAI and has a history with Y Combinator, while their brother Max co-founded Saga Ventures, which also raised a fund in 2024. This rapid fundraising highlights Jack Altman's strong network and expertise in the venture capital landscape.