Question: The company that  employs approximately 100,000 people and had a merger with a Fortune 500 company headquartered in the Greenspoint district and in unincorporated Harris County, Texas, is the worlds largest what?
Sentence (from "Smith International"): Smith International was a Fortune 500 company headquartered in the Greenspoint district and in unincorporated Harris County, Texas.
Relevant evidence: Yes