When I joined Ingres in 1985, it was one of the "big three" relational vendors.
- Relational Software, Inc., makers of Oracle, founded by Larry Ellison and Bob Miner
- Relational Technology, Inc., makers of Ingres, founded by Michael Stonebraker, Eugene Wong, Larry Rowe, and (I think) Jon Nackerud and Gary Morgenthaler.
- Relational Database Systems, Inc., makers of Informix, founded by Roger Sippl.