---
title: "SUMMIT PARTNERS L P — Ownership Dossier"
canonical: https://whiteintel.dev/entity/a3dfb9d5-8957-56df-b3e4-fd0cf3d2790c
json: https://whiteintel.dev/api/public/dossier/a3dfb9d5-8957-56df-b3e4-fd0cf3d2790c
identifier: sec:0000830588
jurisdiction: US
risk: Low
source: WhiteIntel corporate-ownership graph
---

# SUMMIT PARTNERS L P

**Type:** Person  
**Jurisdiction:** [US](https://whiteintel.dev/jurisdictions/us)  
**Identifier:** `sec:0000830588`  
**Risk level:** Low  
**Canonical dossier:** https://whiteintel.dev/entity/a3dfb9d5-8957-56df-b3e4-fd0cf3d2790c  
**Structured JSON / MCP:** https://whiteintel.dev/api/public/dossier/a3dfb9d5-8957-56df-b3e4-fd0cf3d2790c  

## Ownership & control

### Holdings / subsidiaries

- **Klaviyo, Inc.** (10% owner) — https://whiteintel.dev/entity/b1a8cd55-4901-52a2-8fd3-0b8cd5c78f27
- **OPTIONSXPRESS HOLDINGS, INC.** (other) — https://whiteintel.dev/entity/74c1cfa1-ccdb-5dd2-98ff-0098371e1973
- **SEABRIGHT HOLDINGS, INC.** (other) — https://whiteintel.dev/entity/22608736-4c80-5ee6-97a7-1084deded02e
- **NIGHTHAWK RADIOLOGY HOLDINGS INC** (other) — https://whiteintel.dev/entity/3cfc8329-5fd6-5674-8372-a46befae1208
- **Solo Brands, Inc.** (tenpercentowner) — https://whiteintel.dev/entity/93d6680b-1dc4-5386-8ce4-bfda67c970f9
- **LifeStance Health Group, Inc.** (tenpercentowner) — https://whiteintel.dev/entity/c0cd6632-e563-5907-bb73-c26485b84705
- **Klaviyo, Inc.** (tenpercentowner) — https://whiteintel.dev/entity/b1a8cd55-4901-52a2-8fd3-0b8cd5c78f27
- **LifeStance Health Group, Inc.** (other) — https://whiteintel.dev/entity/c0cd6632-e563-5907-bb73-c26485b84705
- **ENGAGESMART, INC.** (tenpercentowner) — https://whiteintel.dev/entity/cd28fe03-5d81-5205-aa8a-2a4ca0bd52c4
- **A10 Networks, Inc.** (tenpercentowner) — https://whiteintel.dev/entity/c42fae5d-af70-5431-b722-17dff6768c66
- **A10 Networks, Inc.** (other) — https://whiteintel.dev/entity/c42fae5d-af70-5431-b722-17dff6768c66
- **A.K.A. BRANDS HOLDING CORP.** (tenpercentowner) — https://whiteintel.dev/entity/43e4b29a-b84a-52df-95ce-405fd55d7bfd

…and **12** more subsidiaries/holdings. Resolve the full list with `get_dossier` on the WhiteIntel MCP (`npx -y @whiteintel/mcp-server`) or a one-off dossier — https://whiteintel.dev/pricing.

## 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 **SUMMIT PARTNERS L P** — https://whiteintel.dev/entity/a3dfb9d5-8957-56df-b3e4-fd0cf3d2790c · pricing https://whiteintel.dev/pricing.

---

_This is the markdown-for-agents view of the WhiteIntel dossier for **SUMMIT PARTNERS L P**. Human view: https://whiteintel.dev/entity/a3dfb9d5-8957-56df-b3e4-fd0cf3d2790c · Structured JSON: https://whiteintel.dev/api/public/dossier/a3dfb9d5-8957-56df-b3e4-fd0cf3d2790c._

_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"._