As of: 2026-10-30 13:42 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/person/sam-mccandlish/

# Sam McCandlish

Co-founder, Anthropic (as of 2026-10-26; source: https://www.sec.gov/Archives/edgar/data/2130357/000162828026067168/anthropicpbc-sx1.htm).

One of Anthropic's seven co-founders; member of the Founder LLC that holds the Class F share with 50.1% of the vote after the IPO (S-1, Oct 2026).

## In the news (1 event, newest first)

- 2026-10-26: [Anthropic files public S-1 (ticker ANT)](https://postcutoff.com/e/2026-10-26-anthropic-files-public-s1-ipo/), Business. For the first time, a frontier lab's finances, compute obligations and governance are on public record under securities law.

## Videos (3)

- 2026-10-09: [“I Asked The AI How Do I Resign” - Ex-Anthropic Researcher On Leaving Anthropic](https://postcutoff.com/v/valuetainment-coxon-asked-the-ai-how-do-i-resign/), Valuetainment Short Clips, YouTube, interview, 72,587 views as of 30 October 2026.
- 2026-10-06: [Ex-Anthropic Insider Tells All | PBD Podcast #868](https://postcutoff.com/v/pbd-podcast-868-jacob-coxon-ex-anthropic-insider/), PBD Podcast, YouTube, interview, 350,752 views as of 27 October 2026.
- 2026-09-25: [Opus 5.5 video from one sentence, with code-generated music and sound effects](https://postcutoff.com/v/vincentwei-opus-5-5-one-sentence-video-x/), Vincent文森特 (@VincentWei93), X, made by AI, 164,857 views as of 23 October 2026.

Profile checked 2026-10-26.