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 183% year-over-year (17 deals in the last 12 months). Average disclosed round size is $470.0M (across 93 rounds with reported amounts).
Portfolio
70
Fund Size
$553M
Top Stage
Series C
Last 12 Mo
15
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
97 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 Hadrian | Series C | $260M | Aug 2026 |
 Adranos | Series C | $120M | Mar 2026 |
 Cerebras Systems | Series H | $1B | Feb 2026 |
| IInferact | Series D | $150M | Jan 2026 |
 LiveKit | Series C | $100M | Jan 2026 |
 Parloa | Series D | $350M | Jan 2026 |
 Hadrian | Growth | $180M | Jan 2026 |
 Base Power | Series D | $1B | Jan 2026 |
| NNexthop | Series B | $500M | Jan 2026 |
 K2 Space | Series D | $500M | Jan 2026 |
| K2 Space | Series C | $250M | Dec 2025 |
 Boom Supersonic | Growth | $300M | Dec 2025 |
 Castelion | Growth | $350M | Dec 2025 |
 Crusoe | Series E | $1.4B | Oct 2025 |
 Base Power | Series C | $1B | Oct 2025 |
 Vulcan Elements | Series C | $65M | Aug 2025 |
 OpenAI | Growth | $8.3B | Aug 2025 |
 Ramp | Growth | $500M | Jul 2025 |
| Castelion | Series B | $350M | Jul 2025 |
| Parloa | Series C | — | May 2025 |
| Base Power | Series B | $200M | Apr 2025 |
| K2 Space | Series B | $110M | Feb 2025 |
 Hammerspace | Unknown | $100M | Jan 2025 |
| OpenAI | Growth | $6.6B | Oct 2024 |
 Coreweave | Growth | $1.1B | May 2024 |
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Top Co-Investors
Coatue Management LLC21 shared
Tiger Global Management, LLC19 shared
Redpoint Ventures18 shared
Lightspeed Venture Partners16 shared
Sequoia Capital15 shared
Index Ventures14 shared
Sutter Hill Ventures12 shared
Fidelity Investments11 shared
Thrive Capital11 shared
D1 Capital Partners11 shared
Founders Fund11 shared
Benchmark11 shared
GV11 shared
T. Rowe Price9 shared
General Catalyst9 shared
Spark Capital9 shared
Salesforce Ventures9 shared
Iconiq Capital, LLC8 shared
Dragoneer Investment Group7 shared
Accel7 shared
Last updated: 7 September 2026