Altimeter is a technology-focused investment firm built by a founder for founders, managing funds across public and private markets. The firm serves as a long-term partner to visionary entrepreneurs at all stages of growth, from private rounds through public market entry.
Deal activity increased 127% year-over-year (25 deals in the last 12 months). Average disclosed round size is $551.8M (across 156 rounds with reported amounts).
Portfolio
104
Fund Size
$553M
Top Stage
Series C
Last 12 Mo
25
Team
BG
Brad Gerstner
Managing Principal
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
191 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 Castelion | Series C | $1B | Aug 2026 |
 Base Power | Series D | $1B | Aug 2026 |
 Thrive Holdings | Unknown | $2B | Aug 2026 |
 Hadrian | Series C | $260M | Aug 2026 |
 Hadrian | Series B | $117M | Aug 2026 |
 K2 Space | Series D | $500M | Jul 2026 |
 Baseten | Series B | $1.5B | Jun 2026 |
 Anthropic | Series H | — | May 2026 |
 Sigma Computing | Series E | $80M | May 2026 |
| AAdranos | Series C | — | Mar 2026 |
 Anduril | Series F | — | Mar 2026 |
 Cerebras | Series H | — | Feb 2026 |
 Inferact | Series D | $150M | Jan 2026 |
 LiveKit | Series C | $100M | Jan 2026 |
| Inferact | Seed | $150M | Jan 2026 |
 Parloa | Series D | — | Jan 2026 |
| Hadrian | Growth | $180M | Jan 2026 |
 CoreWeave | Growth | $2B | Jan 2026 |
 Nexthop AI | Unknown | $500M | Jan 2026 |
| Base Power | Series D | $1B | Jan 2026 |
| NNexthop | Series B | $500M | Jan 2026 |
| K2 Space | Series D | $500M | Jan 2026 |
| Baseten | Series E | $300M | Jan 2026 |
| Anthropic | Series G | — | Jan 2026 |
| AAnthropic, PBC | Series H | — | Jan 2026 |
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Top Co-Investors
Coatue Management LLC45 shared
Sequoia Capital41 shared
Lightspeed Venture Partners35 shared
Tiger Global Management, LLC34 shared
Redpoint Ventures31 shared
Andreessen Horowitz29 shared
General Catalyst27 shared
D1 Capital Partners26 shared
Thrive Capital22 shared
Founders Fund21 shared
Spark Capital21 shared
T. Rowe Price20 shared
Iconiq Capital, LLC20 shared
Benchmark17 shared
Index Ventures17 shared
Sutter Hill Ventures17 shared
Insight Partners17 shared
Lux Capital15 shared
Last updated: 20 October 2026