Where is OpenAI headquartered?

OpenAI is headquartered in San Francisco, with its operations concentrated in the Mission Bay district. Its core campus spans the former Uber buildings at 1455 and 1515 Third Street (about 486,600 square feet), and its legal pages reference a 1455 Third Street, San Francisco, CA 94158 address; the company's earlier historic home was the Pioneer Building in the Mission.

By March 2026, reporting indicated OpenAI had pushed its San Francisco footprint past 1 million square feet across multiple Mission Bay leases — including a ~315,000-square-foot building at 550 Terry Francois (the former Old Navy HQ) and a ~280,000-square-foot sublease at 1800 Owens Street (the former Dropbox HQ) — making the city its unambiguous center of gravity.

Beyond San Francisco, OpenAI has built a US presence in New York and Seattle and an international footprint that includes London, Dublin, and Tokyo, with newer offices in Paris, Brussels, and Singapore. These offices anchor enterprise sales, policy and government engagement (notably Brussels and Washington-adjacent functions), and regional go-to-market.

They are far smaller than the San Francisco research-and-engineering core, however. The international footprint exists to put sales, policy, and partnerships staff close to regional customers and regulators, not to relocate the company's center of gravity, which remains firmly in the Bay Area.

For sellers and partners, the practical message is that San Francisco is where the buyers cluster: research, engineering, infrastructure, and most senior decision-makers sit in the Bay Area on Pacific time. Field events, executive briefings, and ABM should center there first.

Secondary US coverage runs through New York and Seattle, while EMEA buyers concentrate in London, Dublin, Paris, and Brussels, and APAC in Tokyo and Singapore. Plan outreach around Pacific-time decision cycles for HQ-owned deals, and use the regional offices to reach local enterprise, policy, and partnerships teams.