Ab Initio Software
| Company type | Private | 
|---|---|
| Industry | Enterprise software | 
| Predecessor | Thinking Machines | 
| Founded | 1995 | 
| Headquarters | , United  States of America | 
| Area served | Worldwide | 
| Website | www.abinitio.com | 
Ab Initio Software is an American software corporation based in Lexington, Massachusetts. The company specializes in develops software for managing information processing systems. It was founded in 1995 by the former CEO of Thinking Machines Corporation, Sheryl Handler, and several other former employees after the bankruptcy of that company.