Life Extension Ventures (LifeX Ventures) is a venture capital firm founded by PhD scientists and serial entrepreneurs that backs founders accelerating the science of longevity for people and planet, investing in software- and data-driven companies across biotech, healthtech, climate, and AI.
Deal activity decreased year-over-year (3 deals in the last 12 months vs 7 prior). Their most common stage is seed (43% of deals). Average disclosed round size is $16.4M (across 19 rounds with reported amounts).
Portfolio
19
Fund Size
$100M
Top Stage
Seed
Last 12 Mo
3
Team
Lisa Kleinsorge
Former Twitter, Spotify, Headspace, Columbia University
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
21 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 NoTraffic | Series C | $90M | Mar 2026 |
 MITO | Seed | $4.5M | Jan 2026 |
 InfiniteWatch | Pre-Seed | $4M | Dec 2025 |
 Ohai | Seed | — | Aug 2025 |
 Dash Bio | Series A | $11M | Jul 2025 |
 Elfie | Series A | $12M | Jun 2025 |
 Stack AI | Series A | $16M | May 2025 |
 Concentro | Seed | $3M | Dec 2024 |
 World Class Health | Seed | $8M | Nov 2024 |
| Dash Bio | Seed | $6.5M | Oct 2024 |
 Mytra | Series B | $78M | Jul 2024 |
 Rhea | Unknown | $10M | May 2024 |
 Century Health | Pre-Seed | $2M | Mar 2024 |
 Cure51 | Seed | $16.2M | Mar 2024 |
 Monomer Bio | Seed | $5.6M | Feb 2024 |
 Haven Energy | Series A | $7M | Jan 2024 |
 Hypervision Surgical | Seed | — | Jun 2023 |
 Cromatic | Seed | $5.3M | Jan 2023 |
| MITO | Pre-Seed | $4.5M | — |
 Onc AI | Series A | $25M | — |
 Zylon | Pre-Seed | $3.2M | — |
Top Co-Investors
Kibo Ventures3 shared
Kfund3 shared
Sequoia Capital3 shared
Everywhere Ventures2 shared
Lightspeed Venture Partners2 shared
FJ Labs2 shared
Swift Ventures2 shared
Freestyle Capital2 shared
Hitachi Ventures1 shared
Sofinnova Partners1 shared
Base10 Partners1 shared
Thiel Capital1 shared
Blue Lion Global1 shared
Eniac Ventures1 shared
New Enterprise Associates1 shared
G9 Ventures1 shared
Brighteye Ventures1 shared
Index Ventures1 shared
Equinor1 shared
Muse Capital1 shared
Last updated: 7 October 2026