# Cobi Blumenfeld-Gantz

> Cobi Blumenfeld-Gantz is the CEO and co-founder of Chapter, an AI-powered Medicare navigation platform he started in 2020 after watching his own parents struggle to enroll. Built with co-founder Vivek Ramaswamy and early backing from J.D. Vance, Chapter crossed $100 million in annual recurring revenue and raised a $100 million Series E in April 2026 at a roughly $3 billion valuation. A former Palantir government-team lead with degrees from Wharton and Cambridge, he calls himself one of the most hated people in the Medicare brokerage business precisely because Chapter's advisors are paid to recommend the best plan rather than the most lucrative one.

- **Role:** CEO & Co-Founder at Chapter
- **Organizations:** Chapter, Palantir Technologies, Dorm Room Diplomacy
- **Nationality:** American
- **Education:** B.S. in Business Economics and History, The Wharton School, University of Pennsylvania, Master's in Public Policy (Thouron Scholar), University of Cambridge
- **Known for:** Built Chapter into a Medicare navigation platform valued at roughly $3 billion., Crossed $100 million in annual recurring revenue, tripling revenue in 2025., Raised a $100 million Series E in April 2026 led by Al Gore's Generation Investment Management.

## Career timeline

- **2009** — Co-founds Dorm Room Diplomacy as a sophomore with Corey Metzman, connecting US and Middle East students through video dialogue.
- **2012** — Dorm Room Diplomacy recognized with a Kathryn Wasserman Davis Project for Peace award.
- **—** — Leads US government teams as a forward-deployed engineer at Palantir Technologies.
- **2020** — Founds Chapter with Vivek Ramaswamy after his parents struggle to navigate Medicare; his parents become Chapter's first two customers.
- **2023** — Testifies before the US Senate Finance Committee on October 18 about deceptive Medicare practices.
- **2024** — Chapter raises a $50 million Series C.
- **2025** — Chapter raises $75 million at a $1.5 billion valuation; grows revenue 3x and crosses $100 million in ARR.
- **2026** — Chapter raises a $100 million Series E led by Generation Investment Management at roughly a $3 billion valuation.

## Achievements

- Built Chapter into a Medicare navigation platform valued at roughly $3 billion.
- Crossed $100 million in annual recurring revenue, tripling revenue in 2025.
- Raised a $100 million Series E in April 2026 led by Al Gore's Generation Investment Management.
- Testified before the US Senate Finance Committee on deceptive Medicare enrollment practices.
- Co-founded Dorm Room Diplomacy and won a Kathryn Wasserman Davis Project for Peace award.

## Latest updates

- **2026-04** — Chapter announced a $100 million Series E led by Generation Investment Management, with Fifth Down Capital and 8VC joining existing investors.

## Links

- Website: https://askchapter.org
- LinkedIn: http://www.linkedin.com/in/cobibgantz
- Twitter/X: https://x.com/CobiBGantz
- YouTube: https://www.youtube.com/watch?v=NVRRvMfhb7s
- Facebook: https://facebook.com/ChapterMedicare

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Profile page: https://yespress.io/cobi-blumenfeld-gantz
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Last updated: 2026-06-14