Cambium Capital Research
Investment Thesis
Cambium Capital is an early-stage venture capital firm based in San Francisco, California, founded in 2018 by Landon Downs and David Moehring. The firm is laser-focused on the future of computation, investing in unproven technologies to drive disruptive innovation across advanced computing, deep tech, and AI/ML infrastructure.
The investment thesis centers on five key pillars of the compute stack: advanced compute silicon, memory storage innovation, data movement, chip packaging, and software toolchains. Cambium believes the next era of computing — particularly the agentic AI era — will require fundamentally new hardware architectures rather than incremental improvements to existing platforms.
As Managing Partner Landon Downs has stated: "The disaggregated architecture is the only way to give each stage of an agentic workflow the silicon it needs." This conviction has been validated across a portfolio spanning quantum to classical computing, silicon to software, and early seed to large Series E co-investments.
Sector Focus
Cambium invests across the deep technology compute stack:
- Advanced compute silicon: custom processor architectures, domain-specific accelerators, RISC-V CPUs, AI inference chips
- Semiconductors: fabless and fab-lite chip startups in RF, memory, photonics, and power electronics
- Quantum computing: digital quantum hardware (Seeqc), trapped-ion quantum computing (IonQ), and quantum fund infrastructure (55 North)
- AI infrastructure: AI inference accelerators (Groq, SambaNova), memory systems for AI workloads (Numem), analog in-memory compute (Sagence AI)
- Infrastructure software: software toolchains for hardware design, cloud optimization, compute orchestration
- Deep tech hardware: millimeter-wave amplifiers (Elve), GNSS/GPS chips (etherWhere), graphene-based photonics (Black Semiconductor), RF power amplifiers (Falcomm)
The firm explicitly avoids consumer applications and non-technical ventures, focusing exclusively on companies with deep engineering foundations in computing hardware or compute-adjacent software.
Stage Focus
Cambium's primary investment stages are Seed through Series B, with a strong preference for being the first institutional investor:
- Seed: Initial institutional backing for research-stage and early-product teams
- Series A: Companies with working prototypes or initial customer traction
- Series B: Follow-on for high-conviction portfolio companies scaling manufacturing or revenue
The firm has demonstrated flexibility in entry stage, investing as early as pre-product seed (Seeqc's $6.8M seed in 2019) and as late as large multi-hundred-million-dollar Series E co-investments (SambaNova's $350M Series E in 2026). They also co-founded 55 North, the world's largest dedicated quantum tech VC fund, alongside Novo Holdings and Vsquared Ventures in October 2024.
Check Size
Core per-investment check size: $1M–$5M. The firm has demonstrated capacity to co-lead much larger rounds as part of syndicates. Notable lead or co-lead positions have included rounds of $4M (Falcomm), $15M (Rapid Silicon, Numem, Elve), $16.3M (etherWhere), $30M (AheadComputing Seed 2), $40M (NeoCognition), and $350M (SambaNova Series E co-lead with Vista Equity Partners).
Lead Tendency
Cambium frequently leads or co-leads investment rounds, particularly at Seed and Series A stages. Notable lead positions include:
- Numem Series A (September 2023) — Cambium led
- Rapid Silicon Series A first close (January 2023) — Cambium led $15M tranche
- etherWhere $16.3M round (July 2024) — Cambium led
- NeoCognition $40M seed (April 2026) — co-led with Walden Catalyst Ventures
- AheadComputing $30M Seed 2 (January 2026) — co-led with Eclipse and Toyota Ventures
- SambaNova $350M Series E (February 2026) — co-led with Vista Equity Partners
Recent Activity (2023–2026)
Cambium has been among the most active deep tech compute investors over the 2023–2026 period:
- June 2026: Co-launched Vector Core Compute (VC2) with Vista Equity Partners — world's first inference cloud powered by CPUs, GPUs, and RDUs, with $3.5B compute commitment to SambaNova
- April 2026: Co-led NeoCognition $40M seed (AI agent lab for specialized intelligence)
- March 2026: Portfolio exit — Exostellar acquired by Qualcomm
- February 2026: Co-led SambaNova $350M Series E alongside Vista Equity Partners and Intel Capital
- January 2026: Co-led AheadComputing $30M Seed 2 for RISC-V CPU architecture
- October 2024: Co-founded 55 North, the world's largest dedicated quantum tech VC fund
- November 2024: Participated in Sagence AI out-of-stealth funding (analog AI inference chips)
- July 2024: Led etherWhere $16.3M round (low-power GNSS chip technology)
- February 2024: Participated in Elve $15M Series A (millimeter-wave amplifiers)
- September 2023: Led Numem Series A and co-led Exostellar $15M Series A
- November 2023: Participated in Falcomm $4M seed (RF power amplifiers)
- January 2023: Led Rapid Silicon Series A first close
Fund status: Actively deploying.
Portfolio Highlights
Cambium's portfolio includes some of the most significant deep tech companies of the 2020s:
Notable Exits:
- Exostellar — acquired by Qualcomm in March/April 2026. Cloud computing optimization startup spun out of Cornell. Cambium co-led the Series A in September 2023.
- Good Chemistry — acquired by SandboxAQ (Landon Downs was co-founder)
Marquee Active Portfolio:
- Groq — early-stage bet on AI inference chip company, now widely regarded as a breakthrough in LLM inference speed
- IonQ (NYSE: IONQ) — pioneer in trapped-ion quantum computing, now publicly traded on NYSE
- SambaNova Systems — full-stack AI inference platform; Cambium co-led the $350M Series E in 2026 and helped launch Vector Core Compute
- AheadComputing — high-performance RISC-V processors founded by ex-Intel CPU architects; Cambium co-led $30M Seed 2
- NeoCognition — AI agent lab for specialized intelligence (spin-out from Ohio State Professor Yu Su); Cambium co-led $40M seed
- Rivos — RISC-V architecture CPU startup
- Seeqc — the first and only company to put all core functions of a quantum computer on a digital chip
- Black Semiconductor — graphene-based photonic microchip company spun out of RWTH Aachen University (Germany)
- Sagence AI (formerly Analog Inference) — analog in-memory compute for AI inference acceleration
- etherWhere — GNSS/GPS chip company with industry-lowest power consumption; Cambium led $16.3M round
- Numem — MRAM-based memory chips for AI compute and edge devices
- Falcomm — fabless semiconductor company with dual-drive power amplifiers for satcom, telecom, and defense
- Elve — millimeter-wave (mmWave) amplifier manufacturer for terrestrial and space applications
- Rapid Silicon — domain-specific FPGA silicon for diverse target applications
- 3D Glass Solutions — manufacturer of high-performance 3D RF passives and photonic devices
Team
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Landon Downs — Co-founder and Managing Partner. Also co-founder and Executive Chairman of 1QBit (quantum computing), Synthesis Health (AI-enabled PACS), and Good Chemistry (acquired by SandboxAQ). Previously co-founder and partner at Agentis Capital (advised on $130B+ of transactions). CFA Charterholder, BComm from University of Victoria, Singularity University Executive Program graduate. Has deployed $6B+ of capital over career including early bets on Groq. LinkedIn: https://ca.linkedin.com/in/landondowns
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David Moehring, PhD — Co-founder and General Partner. PhD in experimental physics. Spent 7 years in the US government leading and managing the development of quantum computers. Focuses on computing hardware venture investments with deep technical diligence capability.
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Peter Ort — General Partner and COO. Former Managing Director at Goldman Sachs (1996). Co-founder of CurAlea Associates (2010). Joined Cambium as Partner in 2020. LinkedIn: https://www.linkedin.com/in/peter-ort-5102a013
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Bill Leszinske — Vice President. Focused on semiconductor investments including AI memory and compute. LinkedIn: https://www.linkedin.com/in/billleszinske
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Benjamin Breach — Venture Capital (Analyst/Associate). Focused on deal sourcing and portfolio support in advanced computing.
Geographic Focus
Primarily United States (San Francisco Bay Area, Pacific Northwest, Northeast corridor). International investment activity confirmed in Canada, UK, Germany, France, and Israel. Notable European portfolio companies include Black Semiconductor (Germany, graphene-based photonics). The firm co-founded 55 North, a Denmark-based quantum fund investing globally.
Decision Process and Founder Preferences
Partnership model with two Managing Partners (Landon Downs and David Moehring) and a GP/COO (Peter Ort). Investment decisions are made by partnership consensus, with David Moehring's deep experimental physics and government quantum computing background enabling unusually rigorous technical diligence on hardware bets.
Cambium backs technical founders with deep domain expertise from academic research institutions, government computing labs, or established semiconductor companies. The portfolio reflects preference for:
- Founders with prior experience at advanced computing companies or research institutions (Cornell, RWTH Aachen, Ohio State, ex-Intel, ex-DARPA, government research labs)
- Teams building in unproven technology domains where the outcome is binary
- Deep tech hardware companies where long development cycles are understood and accepted
- Founders building in the compute stack (silicon through software), particularly those where the agentic AI era creates structural demand
Cambium's investment in the Vista Equity Partners relationship — co-founding Vector Core Compute and co-leading SambaNova's Series E — gives portfolio companies access to Vista's 90+ software portfolio companies and 750M+ end users as potential customers for compute infrastructure.