Jack Altman
Jack Altman is a general partner at Benchmark and a member of its management company, and the co-founder and executive chairman of Lattice.
Contents7 sections
Key facts
Current Roles and Regulatory Record
Benchmark’s 2026 Form ADV Schedule A lists Jack Altman as a member of the management company, acquired in February 2026, with ownership code B, indicating 10% to less than 25%, and lists him as a control person. In February 2026, he joined Benchmark as a general partner.[1]
Founding Lattice and Role Changes
Altman co-founded Lattice with Eric Koslow; in a 2023 announcement, he said he would hand the CEO role to Sarah Franklin and become executive chairman. Lattice’s current board page still lists him as co-founder and executive chairman.[2]
Alt Capital and the Move to Benchmark
Before joining Benchmark, Altman ran Alt Capital, which raised a $150 million first fund in 2024 and announced a second fund of about $274 million in 2025; his team came with him when he joined Benchmark, but Alt Capital’s subsequent structure and the handling of its portfolio were still unclear at the time.[3]
Pre-Founding Career and Investments
Before founding Lattice, Altman was vice president of business and corporate development at Teespring, and he was an early investor in companies including Opendoor, Flexport, and PlanGrid. This list of companies is part of his personal history and should not be confused with the later fund holdings of Alt Capital or Benchmark.[4]
Education
Altman holds a bachelor’s degree in economics from Princeton UniversityPrinceton UniversityPrinceton University is a private university and Ivy League member in Princeton, New Jersey. Chartered on October 22, 1746 as the College of New Jersey, it moved to Princeton in 1756 and adopted its present name in 1896. Undergraduate education leads to A.B. and B.S.E. degrees and emphasizes small-group discussion, independent research and residential college life. Graduate education spans the humanities, social sciences, natural sciences and engineering. As of October 2026, Christopher L. Eisgruber was president. Its 2026–27 operating budget was $3.407 billion, including $342 million for undergraduate aid.Open the full entry.[4]
Information Limits
Form ADV ownership code B applies only to the Benchmark management company. Alt Capital’s fundraising, Lattice’s valuation, board seats, and the size of Benchmark’s new funds cannot be treated directly as Altman’s personal assets.[1]