O'Neil Technologies is a high tech technology company started by April O'Neil, Casey Jones, and Donatello (presumably the Utroms had a hand in this as well). O'Neil Tech has only appeared in Teenage Mutant Ninja Turtles: Fast Forward where it's run by April and Casey's descendant Cody Jones. Though it's actually run by his maternal uncle Darius Dun who is trying to take it over from under his nephew's nose. Now that Darius was exposed as the villain he is, Cody presumably may have complete control over his company.
O'Neil Tech was created some time in the 21st century.
After it is revealed that Darius was making weapons, Cody was temporarily in control of the company until the board of directors could find a new CEO.