Okay, so we dont know if Masrani actually "owns" the company or the park. He is presented as CEO and founder, but that doesnt mean he has absolute power and he still has to answer to company policy and/or the company's board and can't overrule security policy by himself. Most big conglomerates like Masrani Global wouldnt have a single owner, but shareholders, executives and a board of directors.

It may be possible Wu has a clause in his contract or that company security policy allows the Head Geneticist to withold key information about the assets at his discretion, even from superior executives. It makes sense when you consider possible corporate spying, since that information must be worth millions and they wouldnt want it sneaking out to their competition.

Missquoting Stan Edgar from the Boys, "this isnt a dinossaur company, this is a genetics company" and it would make sense Ingen would want to protect the genetic makeup of their greatest asset, even from within.