Sinai Capital Partners began inside Eagle Advisors, a family office linked to an SAP cofounder, rather than being built through typical outside investors, and it built its name writing large checks and buying into secondary deals for Los Angeles companies that had outgrown local funding options, while also running New Slate Ventures to back inclusive, culturally significant film and TV projects. Today the firm describes itself as an early-stage fund for builders, focused on hard-tech areas like robotics, quantum technology, compute architecture, energy, IoT, and biotech.