People · Operator
Named in public records as an officer, director or promoter · active 2023–2024 · Healthtech
| Company | Role | Sector | Stage | Raised · real | Value · est | Tied |
|---|---|---|---|---|---|---|
| K Health, Inc. | — | Healthtech | Series D+ | $353.4M | $915.7M | 2024 |
| Accompany Health, Inc. | — | Healthtech | Series C | $56.3M | $680.7M | 2023 |
Vivian Riefberg at the center, the companies they're named on, and every other operator named alongside them — an interlock map of shared founding teams, boards and funds. Name-matched, so treat as a research lead.
People named alongside Vivian Riefberg on the same companies — an interlock signal (shared founding team, board, or fund). Name-matched, so verify before acting.
| Operator | Shared | Their companies |
|---|---|---|
| Bryan Roberts | 1 | 18 |
| Antonio Gracias | 1 | 15 |
| Hans Tung | 1 | 11 |
| Robert Kocher | 1 | 5 |
| Alejandro Zubillaga | 1 | 5 |
| Allon Bloch | 1 | 4 |
| MARK TLUSZCZ | 1 | 3 |
| Rahul Rajkumar | 1 | 1 |
| Adam Singolda | 1 | 1 |
| Ashok Balakrishnan | 1 | 1 |
| Ran Shaul | 1 | 1 |
| Chen Yehudai | 1 | 1 |
| Yaron Savoray | 1 | 1 |
| Stephanie Lovell | 1 | 1 |
People are matched by normalized name across records; a common name may merge distinct individuals. Treat as a research lead, the same way modeled valuations are directional, not quoted.