Venture Capital

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KIZOO Technology Ventures

Michael Greve's KIZOO Technology Ventures channels his 1&1 Internet exit into early-stage longevity and deep-tech startups from Karlsruhe, Germany.

KIZOO Technology Ventures logo

KIZOO Technology Ventures

KIZOO Technology Ventures operates from Karlsruhe, Germany, as an early-stage asset manager founded by Michael Greve. The firm draws its capital base from Greve's successful exit of 1&1 Internet, the web-hosting business he co-founded and later sold to United Internet. This entrepreneurial-liquidity origin places KIZOO outside the traditional family-office or institutional-fund mold; it functions as a personal conviction vehicle channeling operator proceeds into companies pursuing radical life extension and computational biology. The strategy concentrates on pre-seed and seed-stage equity across biotechnology and deep-tech software. Portfolio allocations span regenerative medicine, AI-driven drug discovery, genomic analysis platforms, and robotics for age-related disease. KIZOO has been a consistent backer of the Methuselah Foundation and contributed seed funding to Unity Biotechnology, a senescence-focused company that later went public. The firm also held early positions in SENS Research Foundation's spinouts and invested alongside Juvenescence in longevity-biotech syndicates. Geographic emphasis remains on US and European startups, with an additional presence in select Israeli ventures. Michael Greve anchors the investment committee, supported by a lean team of scientists-turned-investors operating without external limited partners. The firm does not maintain a traditional fund structure; each investment draws directly from committed personal capital. In January 2023, KIZOO participated in a $40 million Series A for Rejuvenate Bio alongside Bold Capital Partners, targeting gene therapies for age-related cardiac decline. Greve also serves on the board of the Forever Healthy Foundation, a non-profit evaluating rejuvenation therapies, which operates adjacent to the investment entity. What structurally separates KIZOO is its indefinite hold period. Without LP redemption pressure or fund-life constraints, the firm can support multi-decade biological development cycles that institutional venture funds routinely avoid. This architecture mimics a philanthropic research endowment more than a conventional venture-capital partnership, anchored to Greve's sustained personal commitment to longevity science rather than portfolio-construction theory.

General information

Firm type

Venture Capital

Year founded

AUM

Undisclosed

Location

Region

Europe

Country

Germany

City

Karlsruhe

Corporate office

Karlsruhe, Germany

Principals

Michael Greve

Founder and Managing Partner

Sector focus

Enterprise SoftwareAI/MLMobility & TransportationEnergy Transition & RenewablesDigital Health

Frequently asked questions

Who runs investment decisions at KIZOO Technology Ventures?

Michael Greve, the founder and managing partner, leads all investment decisions. Greve co-founded 1&1 Internet, a pioneering European web-hosting company, and sold it to United Internet. After the exit, he redirected his capital and attention toward longevity biotechnology. There is no external investment committee; Greve operates with a small internal team of scientists who advise on technical due diligence.

How does KIZOO source its deals?

KIZOO sources primarily through academic and scientific networks in aging research, including relationships with the Methuselah Foundation, SENS Research Foundation, and various European and US longevity hubs. Greve's personal involvement in the Forever Healthy Foundation provides additional inbound founder referrals. The firm does not rely on traditional venture deal flow from accelerator demo days or investment banks.

Is KIZOO structured as a family office or a venture fund?

Neither precisely. KIZOO functions as an asset manager deploying Michael Greve's personal capital without external limited partners. It does not raise traditional blind-pool funds and has no mandated return timeline. This structure grants KIZOO permanent capital with an indefinite holding period, distinguishing it from both multi-family offices and closed-end venture funds.

Which sectors does KIZOO focus on?

The firm concentrates on longevity biotechnology, including cellular senescence, gene therapy, epigenetic reprogramming, and AI-driven drug discovery. It also invests in computational biology, robotics for age-related conditions, and neurodegeneration platforms. KIZOO explicitly avoids consumer digital, enterprise SaaS, and fintech unless the technology has a direct therapeutic application in aging.

Does KIZOO participate in follow-on rounds?

Yes. Because KIZOO is not constrained by fund reserve ratios, it can and does participate in follow-on rounds when the science merits continued support and the syndicate aligns. Greve has described the approach as 'patient capital' committed to the full development arc of a company, not just the initial seed phase.

How does KIZOO relate to the Forever Healthy Foundation?

Both entities were established by Michael Greve and share a mission focus on extending healthy human lifespan. The Forever Healthy Foundation is a non-profit that conducts philanthropic funding and public evaluation of rejuvenation therapies. KIZOO Technology Ventures is the for-profit investment vehicle. Greve maintains a firewall between the two, though their scientific advisory networks overlap.

What is KIZOO's known posture on co-investments?

KIZOO regularly co-invests alongside aligned syndicate partners such as Juvenescence, Bold Capital Partners, and other longevity-focused investors. It prefers syndicates where other participants share a multi-decade thesis on aging biology rather than traditional VC exit timelines. KIZOO does not anchor or lead large institutional rounds but participates actively in pre-seed and seed consortia.

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