Weaviate

One-liner — An open-source, AI-native vector database (plus managed cloud) — the self-hostable alternative to Pinecone for RAG retrieval, so embeddings can stay in your own environment.

What it does — Weaviate stores embeddings and serves vector, keyword, and hybrid search, with built-in modules for embedding generation and RAG. In a pipeline it is the vector-retrieval layer. Its differentiator versus managed pure-plays is that you can run it yourself (open source) or use Weaviate Cloud — useful when data cannot leave your tenancy.

Where it sits in the stack — vector-retrieval, retrieval layer (Day-1 if doing RAG). Risk role: it holds sensitive data (your corpus embeddings). Multi-tenancy and RBAC support tenant/entitlement separation; entitlement-aware retrieval is still your wiring.

Deployment & architecture — Self-hostable open-source core (BSD-3) deployable in your own cloud/Kubernetes, plus Weaviate Cloud (managed SaaS) and a serverless option. API/SDK-driven; integrates with LangChain/LlamaIndex and major embedding providers.

Positioning & differentiators — Open-source + self-host is the key contrast with managed-only pinecone; versus opensearch it is purpose-built as a vector DB rather than a search engine with vectors bolted on; versus azure-ai-search it is cloud-neutral. Trade-off: you own the operational burden if you self-host.

Ownership, funding & M&A — Independent, VC-backed (company formerly SeMI Technologies). Founded 2019 by Bob van Luijt; HQ Amsterdam. $50M Series B led by Index Ventures (2023); ~$50M Series C led by Battery Ventures and Index Ventures (Oct 2025), reported ~$200M valuation; ~$118M total (reports vary). No M&A; independent as of 2026-06. Confidence: high.

CTO / hedge-fund lens — Day-1 RAG infra and the stronger fit when data residency / MNPI rules mean embeddings must stay in your own environment — self-host gives you that. Cost is the ops burden of running a stateful DB yourself; Weaviate Cloud trades that back for third-party hosting.

Competitors / alternatives — pinecone, opensearch, azure-ai-search, Qdrant/Milvus (not in registry).

Open questions / to verify — Exact total-funding figure (sources range ~$67–118M); Series C valuation.

Sources

• Weaviate raises $50M Series B (PR Newswire) — fetched 2026-06-28 — supports: Series B, founding, HQ; confidence: high
• [raw/sources/2026-06-28—weaviate—funding.md] — supports: Series C 2025, ownership independent; confidence: medium

History

• [2026-06-28] Stub created from seed registry.
• [2026-06-28] Researched (light); ownership independent/VC-backed (Series B 2023, Series C 2025, high). Positioned as self-hostable Pinecone alternative for data residency.