# AI21 Labs

> Enterprise AI model developer behind the Jamba hybrid state-space and transformer family.

## Why it is interesting

An established builder of hybrid SSM-transformer models. Important data correction: its $208M Series C includes the earlier $155M close; the widely reported $300M Series D in 2025 never closed.

## Profile

- **Latest funding:** Series C (including $155M August 2023 initial close and $53M extension) — $208M total for entire Series C; do not add $155M separately (November 21, 2023)
- **Latest known valuation:** $1.4B (November 2023 valuation) (November 21, 2023)
- **Total disclosed equity funding:** $208M
- **Stage:** growth
- **Status:** private
- **Industries:** N/A
- **Coverage:** full
- **Last updated:** 2026-11-13
- **Latest funding investors:** Walden Catalyst, Pitango, SCB10X, b2venture, Samsung Next, Google, NVIDIA, Intel Capital, Comcast Ventures, Ahren Innovation Capital

## Key facts

- $155M initial Series C announced August 2023; extended by $53M to $208M total in November
- Company's latest independently verified completed financing is November 2023 Series C extension
- 2025 reported $300M Series D never closed, per CTech in January 2026
- Jamba2 uses a hybrid SSM-transformer model architecture

## Funding history

- Series C (including $155M August 2023 initial close and $53M extension) · $208M total for entire Series C; do not add $155M separately · November 21, 2023
  Source: https://www.ai21.com/blog/ai21-completes-208-million-oversubscribed-series-c-round/

**By:** [Venture Capital Tracker](https://venturecapitaltracker.com/editorial-policy)
**Last updated:** November 13, 2026

**Editorial note:** AI tools assisted with research, structure, or drafting. Venture Capital Tracker retains human editorial responsibility for factual accuracy, relevance, and source quality before publication.

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Source: https://venturecapitaltracker.com/startup/ai21-labs