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Sam Altman
Angel investor · Founded 2012 · Active in 2026
Sam Altman is an angel investor based in San Francisco, USA, founded in 2012. The page below shows 24 Power Law outcomes from Sam Altman's portfolio — 20 unicorns ($1B+ valuation) and 2 additional thoroughbreds (companies that crossed $100M+ in revenue without yet reaching $1B+ valuation).
Outcomes are concentrated in Other B2B Software · Fintech · Transportation; top portfolio geographies are USA · Senegal. Sam Altman ranks #139 in Global in the 2026 Dealroom Power Law Investor Ranking by cross-stage outcomes.
Sam Altman’s biggest exits.
Sam Altman portfolio companies worth $1B+ that have IPO’d or been acquired. Each shows its valuation at exit and, in grey, its current value if still public.
Sam Altman’s selected top holdings.
An estimate of Sam Altman’s largest live positions — disclosed shareholding × Dealroom’s latest valuation — across 2 companies where Sam Altman is a named shareholder, worth about $870M in estimated equity value.
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1
Helion Energy
14.2%
$5.4B
$770M
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2
Meter
10%
$1.0B
$100M
Estimated value = Sam Altman’s disclosed ownership % × Dealroom’s latest company valuation; direct named stakes only, exited positions excluded. Figures are indicative, not reported marks. Sam Altman also appears inside investor groups in Boom Supersonic, Coalition, Neuralink, OpenAI, Quora, World, where a standalone stake isn’t disclosed. See the underlying cap tables on Dealroom →
The 24 Sam Altman Power Law outcomes ($100M+ revenue or $1B+ valuation).
Snapshot of where the outcomes are concentrated by country, sector, and stage entered.
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USA23
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Senegal1
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Other B2B Software4
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Fintech4
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Transportation3
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Biotech & Life Sciences3
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Energy2
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AI2
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Edtech2
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eCommerce & Marketplaces2
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Marketing1
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Other1
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Series B+8
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Series A8
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Seed7
Sam Altman's 24 Power Law outcomes.
How does Sam Altman stack up?
Sam Altman in orange, your selection in blue and other colours. Pick from the global roster of 35 peer investors — scope by startup location or hit "Find similar shapes" to auto-pick the three closest. The funnel matrix mirrors the spider chart on the ranking page; the line chart shows each firm's share of unicorns minted in the selected startup location — peaks reveal vintage years.
Share of new unicorns per year
% of global unicorns minted that year, year by year · hover the chart to see which unicornsStage focus
Companies by entry stage and outcome tierSector focus
Companies per investor across the 10 highest-volume sectorsWhere Sam Altman's portfolio founders come from — and where they studied.
80 founders across the 24 Power Law outcomes — split by country of origin, university attended, and the company they worked at before founding. Stanford University and Alphabet | Google are the deepest single pipelines.
Key people at Sam Altman.
Market sentiment
What the market is saying about Sam Altman
An AI-synthesized read of the highest-engagement posts about Sam Altman on X over the past 7 days. We rank by likes & retweets, ignore corporate channels, and surface the themes that broke out from real people.
Reading the room on X — pulling top posts and synthesizing themes…
Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour
In the news
Latest news about Sam Altman
Recent press, funding announcements, and portfolio moves mentioning Sam Altman — pulled live from Dealroom's news feed.
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