This is well known Transamerica Pyramid in San Francisco. But what is Transamerica?

Although the tower no longer serves as the Transamerica Corporation headquarters, it is still strongly associated with the company and is depicted in the company's logo. In 1999, Transamerica was acquired by Dutch insurance company Aegon. When the non-insurance operations of Transamerica were later sold to GE Capital, Aegon retained the building as an investment