Stuart is an incredible partner, negotiator and legal mind,” and “Stuart is tremendous. He really gets involved and drives the deal to the optimal commercial outcome.”
- Chambers USA, (Client Quotes)
Stuart Casillas is a corporate partner in Kirkland’s Bay Area and Austin offices and a leader in the M&A practice, focused on complex, high-value private equity transactions. For more than two decades, Stuart has served as lead counsel on some of the most significant private equity-led technology deals, establishing himself as a premier advisor in the sector.
Stuart represents leading global investment firms principally focusing on software, data and technology-enabled businesses regularly serving as lead counsel on significant transactions across portfolios. His practice encompasses the full spectrum of private equity deal structures, including take-private transactions, leveraged buyouts, growth equity investments and complex carve-outs across the technology landscape. Stuart has serves as lead M&A counsel to many top-tier private equity firms including Vista Equity Partners, GI Partners, Energize Capital, Gryphon Investors, Industrial Growth Partners and Swander Pace Capital. His transaction experience spans critical technology sectors including enterprise software, cybersecurity, edtech, fintech, healthcare technology, logistics and data analytics.
Stuart is ranked in Chambers USA, Private Equity: Buyouts since 2024, where clients have remarked “Stuart is an extension of our team. He combines great customer service with a tremendous amount of knowledge and experience on transactions.” He was also named to MergerLinks’ list of the “Top Technology Lawyers in North America” in 2021, recognizing his leadership in the sector.
