American businessman John Arillaga has an estimated net worth of $2.4 billion as of April 2016 according to Forbes. Most of his net worth is reported to be derived from his real estate business. He is considered as one of Silicon Valley's popular landowners. His business involves developing real estates in Silicon Valley.

Of Basque ancestry, John Arillaga attended Stanford University where he finished his degree in Geography in 1960. He is currently married to Frances C. Arrillaga with whom he has a daughter named Laura, and a son named John Jr. He has three grandsons named Benjamin, Jack and Finn through his son. John Arillaga Sr. currently lives in Portola Valley, California.

Together with Richard (Dick) Peery, John Arillaga purchased a vast farmland and later on, offices were built on it. Currently, the firm formed by the duo, the Peery-Arrillaga firm, manages less than a million square feet of office buildings as well as 290 acres of land in San Jose.