# Irregular Expressions (slim)

> 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.

- Full: https://www.anchorterminal.com/investors/irregular-expressions/index.md (~500 tokens) · this version ~380 tokens · JSON https://www.anchorterminal.com/investors/irregular-expressions/index.json · canonical https://www.anchorterminal.com/investors/irregular-expressions/
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-28
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

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.

### 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.