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 144% year-over-year (22 deals in the last 12 months). Average disclosed round size is $573.1M (across 147 rounds with reported amounts).
Portfolio
102
Fund Size
$553M
Top Stage
Series C
Last 12 Mo
22
Team
BG
Brad Gerstner
Managing Principal
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
179 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 |
| 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 |
| AAnthropic, PBC | Series G | — | Jan 2026 |
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Top Co-Investors
Coatue Management LLC43 shared
Tiger Global Management, LLC35 shared
Lightspeed Venture Partners34 shared
Sequoia Capital31 shared
Redpoint Ventures27 shared
General Catalyst26 shared
D1 Capital Partners24 shared
Andreessen Horowitz24 shared
T. Rowe Price20 shared
Founders Fund20 shared
Thrive Capital19 shared
Spark Capital18 shared
Benchmark17 shared
Index Ventures17 shared
Insight Partners17 shared
Iconiq Capital, LLC16 shared
Sutter Hill Ventures16 shared
Fidelity Investments14 shared
Last updated: 7 October 2026