# Irregular Expressions

> Irregular Expressions's investments in AI tools on Anchor Terminal, Pydantic and Pydantic Services Inc., with each listing's grade and the founders behind it.

- Canonical: https://www.anchorterminal.com/investors/irregular-expressions/
- Markdown: https://www.anchorterminal.com/investors/irregular-expressions/index.md (~500 tokens)
- Slim: https://www.anchorterminal.com/investors/irregular-expressions/index.min.md (~380 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/investors/irregular-expressions/index.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-10-28

Venture firm.

## Companies on Anchor Terminal

- **Pydantic**, Seed, February 2023, Series A, October 2024
  - [Pydantic AI](https://www.anchorterminal.com/tools/pydantic-ai.md), graded A, 81.9/100
  - Source: https://pydantic.dev/articles/company-announcement
- **Pydantic Services Inc.**, Seed, February 2023, Series A, October 2024
  - [Pydantic Logfire](https://www.anchorterminal.com/tools/pydantic-logfire.md), graded B, 65.1/100
  - Source: https://pydantic.dev/articles/company-announcement

## Where they invest

- Agent frameworks & SDKs, 1
- Agent observability & evals, 1

## Founders they backed

- [Samuel Colvin](https://www.anchorterminal.com/people/samuel-colvin/), Pydantic, Pydantic Services Inc.

## Questions

### Which AI tools has Irregular Expressions invested in?

Anchor Terminal lists Pydantic and Pydantic Services Inc. backed by Irregular Expressions.

### How are Irregular Expressions's companies graded?

On Anchor Terminal's benchmark, Pydantic AI (A, 81.9) and Pydantic Logfire (B, 65.1).

Investors are named from the companies' own announcements, the investors' own pages, Y Combinator's company pages, public filings and news reports of a round, each with its source. An investor isn't a sign of quality, and nobody can pay to be listed or to change a grade. To correct something or have a page removed, write to privacy@anchorterminal.com.

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