Sam Altman portfolio

Sam Altman has 13 portfolio companies on record at Recent Funding, with 1 investment in the last 12 months.

Website: samaltman.com.

Type: Investor.

Portfolio on Recent Funding: 13.

Deals, last 12 months: 1.

Rounds led: 5 of 16.

Capital in their rounds: $1.49B.

Latest deal: Exowatt · May 7, 2026.

About this page

It is an angel investor. It led 5 of the 16 rounds it joined. Its most recent investment on record is Exowatt's $70M Series A round in May 2026, alongside Thrive Capital, Atomic, MVP Ventures and 6 others. By category, its portfolio leans toward Developer tools and cloud (3) and Fintech (3). It has co-invested with Felicis, Capricorn Investment Group and Mithril Capital, most often Felicis (3 rounds).

About Sam Altman

Firm type: Investor.

Sectors: Crypto & Web3.

What Sam Altman invests in

Sam Altman recent investments

Company	Round	Date	Alongside
EExowatt	Series A · $70M	May 7, 2026	Thrive Capital, Atomic, MVP Ventures +6
EExowatt	Series A · $50M	Nov 14, 2025	Protagonist, Overmatch Ventures, Dragon Global +6
HHelion Energy	Series B+ · $425M	Jan 28, 2025	Capricorn Investment Group, SoftBank Vision Fund 2, Mithril Capital +3
EExowatt	Seed · $20M	Apr 22, 2024	8090 Industries, Atomic, Climate Capital +3
MMeter	Series B+ · $35M · lead	Feb 13, 2024	none named
SSlope	Series A · $30M	Sep 27, 2023	Michael Tannenbaum, MONASHEES, Max Altman +6
MMeanwhile	Seed · $19M · lead	Jun 5, 2023	Parker Conrad, Socially Financed, StillMark +6
MMeter	Series B+ · $38M	May 23, 2022	Sanjit Biswas, Reid Hoffman, Tobias Lutke +6

How Sam Altman invests

Stage	Deals	Capital in rounds
Series B+	9 56%	$1.2B
Series A	5 31%	$250M
Seed	2 13%	$39M

Year	Deals	Capital in rounds
2018	1 6%	$32M
2020	3 19%	$140M
2021	4 25%	$630M
2022	1 6%	$38M
2023	2 13%	$49M
2024	2 13%	$55M
2025	2 13%	$475M
2026	1 6%	$70M

Sam Altman portfolio companies

EExowatt$70MSeries A · May 2026
HHelion Energy$425MSeries B+ · Jan 2025
MMeter$35MSeries B+ · Feb 2024
SSlope$30MSeries A · Sep 2023
MMeanwhile$19MSeed · Jun 2023
RRescaleSeries B+ · Nov 2021
HHumane$100MSeries B+ · Sep 2021
RRoutable$30MSeries B+ · Apr 2021
AAspen Neuroscience$70MSeries A · Apr 2020
CCampusbacker
RRoboflowbacker
PPlanebacker
CConceptionbacker

Company	Round with Sam Altman	Total raised	Latest raise
EExowatt AI infrastructure and compute	May 7, 2026 Series A · $70M	$140M	May 7, 2026 Series A
HHelion Energy Climate and energy	Jan 28, 2025 Series B+ · $425M	$1.44B	Jun 4, 2026 Series B+
MMeter Robotics and hardware	Feb 13, 2024 Series B+ · $35M · lead	$243M	Jun 12, 2025 Series B+
SSlope Stablecoins	Sep 27, 2023 Series A · $30M	$95M	Jul 17, 2024 round
MMeanwhile Insurance	Jun 5, 2023 Seed · $19M · lead	$178.5M	Oct 9, 2026 round
RRescale AI infrastructure and compute	Nov 23, 2021 Series B+	$203.4M	Oct 11, 2025 Series B+
HHumane Robotics and hardware	Sep 1, 2021 Series B+ · $100M	$139M	Sep 1, 2021 Series B+
RRoutable Fintech	Apr 15, 2021 Series B+ · $30M · lead	$42M	May 26, 2025 Series B+
AAspen Neuroscience Health and bio	Apr 1, 2020 Series A · $70M	$339M	Nov 20, 2025 Series B+
CCampus Education	backer · source	$69M	Mar 20, 2025 Series B+
RRoboflow	backer	$40M	Oct 4, 2025 Series B+
PPlane Legal and compliance	backer	$4M	Jan 28, 2026 Series B+
CConception Health and bio	backer	undisclosed	—

Most frequent co-investors

Similar investors

Investors whose portfolios on Recent Funding center on the same category (Developer tools and cloud).

How this is counted

Firm profile: Fundraising Fox Open Dataset v2026-11, CC BY 4.0. Track-record counts are theirs, not Recent Funding's.

Share is of the 16 rounds on Recent Funding that name Sam Altman. Rounds with no announced date are left out of the year split, and "round" is a round whose stage is not on file.

Portfolio companies are the companies on Recent Funding with a round that lists Sam Altman, which is a subset of its real portfolio. API: /api/v1/investors/sam-altman (get a free API key). More: the most active VC firms and new venture capital funds.