Innovative Online Industries, or IOI (pronounced eye-oh-eye) was a global communications conglomerate and the world's largest Internet service provider. A large portion of IOI's business centered around providing access to the OASIS and on selling goods and services inside it. For this reason, IOI had attempted several hostile takeovers of Gregarious Simulation Systems, all of which had failed. Now they are trying to seize control of GSS by exploiting a loophole in Halliday’s will. The IOI's headquarters is located at 101 IOI Plaza in Columbus OH.
IOI had created a new department within the company that they called their "Oology Division." ("Oology" was originally defined as "the science of studying birds' eggs," but in light of Halliday's contest, it had taken on a second meaning: the "science" of searching for Halliday’s Easter egg.) IOI’s Oology Division had but one purpose: to win Halliday’s contest and seize control of his fortune, his company, and the OASIS itself.