# Sam Altman: angel investments and portfolio

> Sam Altman is an angel based in United States. 82 investments on record, 3 in the last 12 months, latest Jun 2026. Portfolio, stages, co-investors and team.

Source: https://millionrounds.com/fund/sam-altman (Millionrounds; every figure on the page links to its filing or article)

United States · [Investor](https://millionrounds.com/investors)

# Sam Altman

Last cheque observed Jun 2026; 82 cheques on record.

Email

Deploying now Angel

Seed Artificial Intelligence Biotechnology

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Deploying now

**25%** of best year **3** **cheques in 12 months**, 82 on record

Since the last cheque **152** days **00** hrs **00** min **00** sec

Median round **$15M** Rounds led **0 of 82** Sole investor **5 rounds** Exits **2 from the portfolio** Mostly in **United States, 89%**

Pitch Sam Altman

## Sam Altman highlights

- 01 3 cheques in the last 12 months
- 02 Mostly Seed and Series A: 74% of its rounds
- 03 Sole investor in 5 rounds, median $95M
- 04 2 exits from the portfolio

## What they do

> The page is Sam Altman's personal blog post discussing AI and a recent incident, with no mention of investment activities. From their own website

- **Type:** Angel (from a list, unverified)
- **Cheque size:** Not stated
- **Stages:** Seed
- **Sectors:** Artificial Intelligence Biotechnology
- **Based in:** United States
- **Cold pitches:** Not stated

## The record

Every round we can evidence, newest first **82 appearances**

- **2026** 3 rounds
- **Jun** **[Longshot Space Technologies](https://millionrounds.com/company/longshot-space-technologies)** Venture · US **$5.0M** With 3 others
- **May** **[Retro Biosciences](https://millionrounds.com/company/retro-biosciences)** Venture · US **Undisclosed** Sole investor
- **Mar** **[Red Queen Bio](https://millionrounds.com/company/red-queen-bio)** Seed · US · Crunchbase News **$15M** With 4 others
- **2025** 8 rounds
- **Oct** **[Arcadia Medicine](https://millionrounds.com/company/arcadia-medicine)** Seed · US **$9.3M** Sole investor
- **Sept** **[teachme.to](https://millionrounds.com/company/teachme-to)** Seed · US **$3.0M** With 4 others
- **Jun** **[Coco Robotics](https://millionrounds.com/company/coco-robotics)** US · TechCrunch **$80M** With 3 others
- **Jun** **[Longshot Space Technologies](https://millionrounds.com/company/longshot-space-technologies)** Venture · US **Undisclosed** With 2 others
- **Jun** **[coco](https://millionrounds.com/company/coco)** Series B · MX **$80M** With 2 others
- **Jan** **[Helion Energy](https://millionrounds.com/company/helion-energy)** Series F · US · Crunchbase News **$425M** With 10 others
- **Jan** **[Retro Biosciences](https://millionrounds.com/company/retro-biosciences)** Series A · US · TechCrunch **$1.0B** Sole investor
- **Jan** **[Ashvattha Therapeutics](https://millionrounds.com/company/ashvattha-therapeutics)** Series B · US **$50M** With 1 other
- **2024** 9 rounds
- **Dec** **[NOYACK](https://millionrounds.com/company/noyack)** Seed · US **$3.0M** With 1 other
- **Oct** **[1910 Genetics](https://millionrounds.com/company/1910-genetics)** Venture · US **Undisclosed** With 3 others
- **Oct** **[Terraformation](https://millionrounds.com/company/terraformation)** Grant · US **$4.2M** With 2 others
- **Sept** **[GALY](https://millionrounds.com/company/galy)** Series B · US **$33M** With 3 others
- **Aug** **[Kami](https://millionrounds.com/company/kami)** Venture · NZ **Undisclosed** With 2 others
- **Aug** **[Beacon AI](https://millionrounds.com/company/beacon-ai)** Series A · US **$15M** With 4 others
- **Jun** **[ValueBase](https://millionrounds.com/company/valuebase)** Seed · US **$6.3M** Sole investor
- **May** **[Apex](https://millionrounds.com/company/apex)** Seed · US **$7.0M** With 2 others
- **Apr** **[Minicircle](https://millionrounds.com/company/minicircle)** Venture · US **$459K** With 4 others
- **2023** 7 rounds
- **Nov** **[Software Applications Incorporated](https://millionrounds.com/company/software-applications-incorporated)** Seed · US **$6.5M** With 3 others
- **Oct** **[Induced AI](https://millionrounds.com/company/induced-ai)** Seed **$2.3M** With 4 others
- **Sept** **[Mentra](https://millionrounds.com/company/mentra)** Seed · US **$3.5M** With 2 others
- **Jun** **[Uncommon](https://millionrounds.com/company/uncommon)** Series A · GB **$30M** With 4 others
- **Apr** **[Arkham Intelligence](https://millionrounds.com/company/arkham-intelligence)** Series A · US **$12M** With 3 others
- **Jan** **[Rewind AI](https://millionrounds.com/company/rewind-ai)** Series A · US **$18M** With 2 others
- **Jan** **[Queer Spaces](https://millionrounds.com/company/queer-spaces)** Venture · US **Undisclosed** With 2 others
- **2022** 4 rounds
- **May** **[TipTop](https://millionrounds.com/company/tiptop)** Series A · TR **$23M** With 3 others
- **Apr** **[Locket Labs](https://millionrounds.com/company/locket-labs)** Seed · US **$10M** With 1 other
- **Apr** **[Context](https://millionrounds.com/company/context)** Seed · US **$20M** With 3 others
- **Apr** **[Retro Biosciences](https://millionrounds.com/company/retro-biosciences)** Pre-seed · US **$180M** Sole investor
- **2021** 3 rounds
- **Nov** **[Conception](https://millionrounds.com/company/conception)** Venture · US **$20M** With 2 others
- **Aug** **[Matrix](https://millionrounds.com/company/matrix)** Seed · US **$5.0M** With 3 others
- **Jul** **[Neuralink](https://millionrounds.com/company/neuralink)** Series C · US · Firms' own news pages **$205M** With 11 others
- **2020** 2 rounds
- **Dec** **[Doorbell Health](https://millionrounds.com/company/doorbell-health)** Seed **$2.5M** With 2 others
- **Dec** **[Realtime](https://millionrounds.com/company/real-time)** Seed **$4.0M** With 2 others
- **2019** 1 round
- **Jun** **[ZeroDown](https://millionrounds.com/company/zerodown)** US · FinSMEs **$30M** With 1 other
- **2018** 3 rounds
- **Feb** **[Coalition](https://millionrounds.com/company/coalition)** Series A · US · FinSMEs **$10M** With 4 others
- **Feb** **[Spring Discovery](https://millionrounds.com/company/spring-discovery)** Seed · US · FinSMEs **$4.3M** With 5 others
- **Jan** **[Asana](https://millionrounds.com/company/asana)** Series D · US · TechCrunch **$75M** With 2 others

An announcement gives the size of the round, not the size of this investor's cheque: the only rounds that imply a cheque are those where they were the sole named investor.

## The team

We hold **1** person at this firm from the lists this database was built from: a weaker source than the filings, since a list does not say when a title ended. Login to see them.

## Exits from the portfolio

Companies it backed that were later bought or listed **2 in all**

**[Exec](https://millionrounds.com/company/exec)** Bought by Handy **Undisclosed** Jan 2014

**[BufferBox](https://millionrounds.com/company/bufferbox)** Bought by [Google](https://millionrounds.com/fund/google-assistant-investments) **$17M** Nov 2012

An exit counts when it came after the firm's first round in the company. From historical deal records.

## The cheque

Seed

Median round joined **$15M** the round, not its cheque Alone, median **$95M**

Led 0 of 82 rounds **0%**

- **Sole investor:** 5 rounds
- **Last cheque:** Jun 2026
- **Exits:** 2 from the portfolio

Rounds by stage said on their site

- Seed said *40*
- Series A *13*
- Venture *9*
- Series B *7*
- Series C *3*

Cheques by month Led Joined

Nov 2023 Oct 2026

Often in the room with

- [SV Angel](https://millionrounds.com/fund/sv-angel) 20
- [Paul Buchheit](https://millionrounds.com/fund/paul-buchheit) 19
- [Alexis Ohanian](https://millionrounds.com/fund/alexis-ohanian) 17
- [Y Combinator](https://millionrounds.com/fund/y-combinator) 16
- [Garry Tan](https://millionrounds.com/fund/garry-tan) 12
- [Andreessen Horowitz](https://millionrounds.com/fund/andreessen-horowitz) 9

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## Who they invest alongside

The investors most often in the same rounds as Sam Altman. A count of rooms they were both in, not a relationship either has claimed.

[**SV Angel** VC firm **20** rounds together](https://millionrounds.com/fund/sv-angel)[**Paul Buchheit** Angel **19** rounds together](https://millionrounds.com/fund/paul-buchheit)[**Alexis Ohanian** Angel **17** rounds together](https://millionrounds.com/fund/alexis-ohanian)[**Y Combinator** Accelerator **16** rounds together](https://millionrounds.com/fund/y-combinator)[**Garry Tan** Angel **12** rounds together](https://millionrounds.com/fund/garry-tan)[**Andreessen Horowitz** VC firm **9** rounds together](https://millionrounds.com/fund/andreessen-horowitz)[**Ashton Kutcher** VC firm **8** rounds together](https://millionrounds.com/fund/ashton-kutcher)[**Start Fund** VC firm **7** rounds together](https://millionrounds.com/fund/start-fund)[**500 Global** Angel **6** rounds together](https://millionrounds.com/fund/500-startups)[**CrunchFund** VC firm **6** rounds together](https://millionrounds.com/fund/crunchfund-3)[**Google Ventures** Corporate VC **6** rounds together](https://millionrounds.com/fund/gv)[**Joshua Schachter** VC firm **6** rounds together](https://millionrounds.com/fund/joshua-schachter)

## Recently backed

The latest companies Sam Altman put money into.

[**Retro Biosciences** May 2026](https://millionrounds.com/company/retro-biosciences)[**Red Queen Bio** $15M · Mar 2026](https://millionrounds.com/company/red-queen-bio)[**Arcadia Medicine** $9.3M · Oct 2025](https://millionrounds.com/company/arcadia-medicine)[**teachme.to** $3.0M · Sept 2025](https://millionrounds.com/company/teachme-to)[**coco** $80M · Jun 2025](https://millionrounds.com/company/coco)[**Helion Energy** $425M · Jan 2025](https://millionrounds.com/company/helion-energy)

## Books by the people here

One book written by people at Sam Altman: [Sam Altman](https://millionrounds.com/person/sam-altman).

- Startup Playbook [Sam Altman](https://millionrounds.com/person/sam-altman) 4.47 from 595 ratings on Goodreads About the book http://playbook.samaltman.com/.. We spend a lot of time advising startups. Though one-on-one advice will always be crucial, we thought it might help us scale Y Combinator if we could distill the most generalizable parts of this advice into a sort of playbook we could give YC… On AmazonListen on Audible
- Find the books for what you are building, or how you invest. [Open the Reading List](https://millionrounds.com/reading-list)

As an Amazon Associate we earn from qualifying purchases.

## On podcasts

6 episodes naming Sam Altman in the title, and 4 more that mention it.

- [Sourcery](https://millionrounds.com/podcasts/sourcery) 30 Oct 2026 · 1h 6m I Got Interviewed! The Story Behind Sourcery, Alex Karp, Sam Altman Clip.. Mentions [Sam Altman](https://millionrounds.com/fund/sam-altman)[Palmer Luckey](https://millionrounds.com/fund/palmer-luckey) Apple PodcastsShow page
- [Cheeky Pint](https://millionrounds.com/podcasts/cheeky-pint) 29 Oct 2026 · 53 min Why Sam Altman is against a single superintelligence Mentions [Sam Altman](https://millionrounds.com/fund/sam-altman) Apple PodcastsShow page
- [Invest Like the Best](https://millionrounds.com/podcasts/invest-like-the-best) 28 Jul 2026 · 54 min Sam Altman - How to Make an Abundant Future - [Invest Like the Best, EP.484] Mentions [Sam Altman](https://millionrounds.com/fund/sam-altman) Apple PodcastsShow page
- [The Twenty Minute VC](https://millionrounds.com/podcasts/20vc) 9 Jul 2026 · 1h 24m 20VC: Sam Altman Offers Trump 5% of OpenAI: Fool or Genius? | Alex Karp Sounds the Alarm: Enterprises Fear Frontier Models & Questionable ROI of AI | The Rise of Chinese Open Source: Deepseek Building Own Chips Mentions [Sam Altman](https://millionrounds.com/fund/sam-altman)[Ashton Kutcher](https://millionrounds.com/fund/ashton-kutcher)[Sound Ventures](https://millionrounds.com/fund/sound-ventures) Apple PodcastsShow page
- [Equity](https://millionrounds.com/podcasts/equity) 15 May 2026 · 40 min Well, do you trust Sam Altman? Mentions [Sam Altman](https://millionrounds.com/fund/sam-altman)[Elon Musk](https://millionrounds.com/fund/elon-musk)[RJ Scaringe](https://millionrounds.com/person/rj-scaringe) Apple Podcasts
- [Sourcery](https://millionrounds.com/podcasts/sourcery) 16 Feb 2026 · 48 min Sam Altman’s Answer to Bots Mentions [Sam Altman](https://millionrounds.com/fund/sam-altman)[Bain Capital](https://millionrounds.com/fund/bain-capital)[Bain Capital Ventures](https://millionrounds.com/fund/bain-capital-ventures) *+1* Apple PodcastsShow page

### Mentioned in

- [This Week in Startups](https://millionrounds.com/podcasts/this-week-in-startups) 21 Aug 2026 · 1h 9m Open source is going to win it all: Harvey proves it | E2328 Apple PodcastsShow page
- [The Further, Faster Podcast](https://millionrounds.com/podcasts/further-faster) 4 Aug 2026 · 55 min Alex Konrad: "No One Cares About Your Startup" | The Further, Faster Podcast Apple PodcastsShow page
- [Equity](https://millionrounds.com/podcasts/equity) 31 Jul 2026 · 36 min AI labs want to pump the brakes, but Amazon and SpaceX are still blasting off Apple Podcasts
- [The Twenty Minute VC](https://millionrounds.com/podcasts/20vc) 11 Jun 2026 · 1h 13m 20VC: SpaceX Launches Largest Ever IPO | OpenAI Files to Go Public | Uber Cuts 23% of HR | Lovable Hits $500M ARR | Founders Revolt Against VCs: The Fundraising Horror Stories Going Viral Apple PodcastsShow page

## Quick answers about Sam Altman

### What does Sam Altman invest in?

Sam Altman invests most often at Seed and Series A (74% of the rounds on record), in sectors such as Artificial Intelligence and Biotechnology.

### How active is Sam Altman?

82 investments on record, 3 of them in the last 12 months. The most recent was in Jun 2026.

### What has Sam Altman invested in recently?

Its most recent investments on record: Longshot Space Technologies (Venture, Jun 2026), Retro Biosciences (Venture, May 2026) and Red Queen Bio (Seed, Mar 2026).

### How big are Sam Altman's cheques?

The median round it joins is $15M.

### Does Sam Altman lead rounds?

Rarely, if at all: none of its 82 investments on record names it as the lead.

### Where does Sam Altman invest?

Most of the companies it backs are in the United States (89%).

### Is Sam Altman investing now?

Yes: it is actively investing, with 3 investments in the last 12 months.

### Who does Sam Altman invest alongside?

Most often SV Angel (20 rounds together), Paul Buchheit (19 rounds together) and Alexis Ohanian (17 rounds together).

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