Harvey announced on September 9, 2026 that it has raised $550 million at a $15.5 billion valuation in a funding round co-led by Diffusion and Lightspeed Venture Partners. The legal AI company said the capital will accelerate its efforts to help law firms, in-house legal teams, and professional services firms build and own their intelligence at scale. Existing investors Sequoia, Kleiner Perkins, a16z, Coatue, Conviction, Elad Gil, Evantic, GIC, Goldman Sachs Alternatives, Verified Capital, and…