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About
Ian Wong was Square's first data scientist and then co-founder and chief technology officer of Opendoor, where the whole business rested on pricing houses accurately at scale. He started Summation in January 2024 with Ramachandran "RC" Ramarathinam, an Opendoor colleague who is chief technology officer. The product sits on top of a company's existing data systems and runs the analysis a finance or operations team would otherwise assemble by hand: it tests scenarios, runs agents against different questions in parallel, and automates reconciliations, variance analysis and management reporting. Summation came out of stealth in 2025 having raised US$35 million from Benchmark and Kleiner Perkins, with a team of roughly 40, most of them in the Bellevue office. Wong spoke at TechTO in September 2020 about how team culture enables growth, and at TechVancouver in December 2021 on his entrepreneurial journey — both while at Opendoor.
Backers
Benchmark and Kleiner Perkins, which together funded the US$35 million disclosed at the 2025 stealth launch.
Quick answers
What does Summation do?
It runs on top of a company's data systems and answers business questions with them — automating reconciliations, variance analysis, forecasts and management reporting rather than leaving them to a manual pull.
Who founded Summation?
Ian Wong, co-founder and former CTO of Opendoor and Square's first data scientist, with Ramachandran "RC" Ramarathinam, in January 2024.
How much has Summation raised?
US$35 million from Benchmark and Kleiner Perkins, disclosed when it came out of stealth in 2025.
Where is Summation based?
Bellevue, Washington.