---
title: "RIEFBERG VIVIAN E. — Ownership Dossier"
canonical: https://whiteintel.dev/entity/0d043360-66ef-5990-a10c-bb3b34fda6fe
json: https://whiteintel.dev/api/public/dossier/0d043360-66ef-5990-a10c-bb3b34fda6fe
identifier: sec:0001843139
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# RIEFBERG VIVIAN E.

**Type:** Company  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0001843139`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/0d043360-66ef-5990-a10c-bb3b34fda6fe  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/0d043360-66ef-5990-a10c-bb3b34fda6fe  

## Ownership & control

### Holdings / subsidiaries

- **Waystar Holding Corp.** (director) — https://whiteintel.dev/entity/f9ab9326-26e3-5354-bc32-354308f1bfcc
- **SIGNIFY HEALTH, INC.** (director) — https://whiteintel.dev/entity/f69c25ea-c642-5d36-b0d8-e6421b2f55e7

## Get the full, resolved dossier (agent-callable)

The above is the free teaser. The resolved **multi-hop UBO chain**, ownership **%**, full **financial history**, itemised **assets** and the hop-by-hop **exposure path** are the paid depth — callable as tools from your agent:

```bash
npx -y @whiteintel/mcp-server   # then: get_dossier · trace_ownership_path · check_offshore_exposure
```

Or unlock a one-off cited dossier for **RIEFBERG VIVIAN E.** — https://whiteintel.dev/entity/0d043360-66ef-5990-a10c-bb3b34fda6fe · pricing https://whiteintel.dev/pricing.

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **RIEFBERG VIVIAN E.**. Human view: https://whiteintel.dev/entity/0d043360-66ef-5990-a10c-bb3b34fda6fe · Structured JSON: https://whiteintel.dev/api/public/dossier/0d043360-66ef-5990-a10c-bb3b34fda6fe._

_Risk levels are heuristic investigative leads, not legal determinations of beneficial ownership. Every claim carries a source; an absent edge means "not yet observed in current sources", not "does not exist"._