Andreessen Horowitz (a16z) is the most concentrated AI investor by dollars, holding positions across the largest model labs, the compute and data layers beneath them, and hundreds of AI-native applications. Founded in 2009, it manages roughly US$106B. Its AI portfolio spans OpenAI, xAI, Mistral, Cursor, Harvey, ElevenLabs and Figure.
a16z deliberately funds the full stack in parallel: frontier and open-weight labs, GPU and inference infrastructure, vector and data tooling, and the application layer sitting on top. The firm's stated view is that value accrues at multiple layers at once during a platform shift, so concentration in a single tier is the real risk.
Its research argues that consumer and vertical AI apps compound faster than model providers because distribution and workflow lock-in are defensible. That thesis funds Cursor, Harvey, Abridge, Sierra, Decagon and ElevenLabs — teams selling into a specific profession rather than selling tokens.
The firm has been an unusually loud backer of open models and generative media, funding Black Forest Labs, Luma, Ideogram, Civitai and World Labs on the argument that open ecosystems and creator tooling expand the market rather than commoditise it.
Through its American Dynamism fund a16z pushes AI into defence, robotics and physical industry — Figure, Skild AI, Anduril and Waymo-adjacent autonomy — treating national-interest hardware as a distinct AI category with its own capital and policy requirements.
Andreessen Horowitz is a registered investment adviser managing roughly US$106B (March 2026 Form ADV) across seed, venture, growth, crypto, bio and American Dynamism funds. It publishes the sector's most-read research through a16z Enterprise and its Top 100 GenAI Apps series, and structurally behaves less like a partnership and more like a platform, with in-house go-to-market, talent, policy and marketing teams attached to each fund.
Disclosed a16z positions across foundation models, AI infrastructure, developer tooling, generative media, vertical applications and embodied AI.
Frontier lab behind GPT and Sora; a16z participated in later secondary and primary rounds.
Elon Musk's frontier lab building Grok and the Colossus training cluster.
Paris-based lab shipping open-weight and commercial models for European enterprises.
Lakehouse platform for enterprise data engineering and model training and serving.
Consumer companion and roleplay platform; a16z led its US$150M Series A.
AI-native code editor and agent, one of the fastest-scaling software businesses in the portfolio.
Agentic IDE and code completion platform formerly known as Codeium.
Maker of Devin, the autonomous software engineer; a16z co-led its US$2B Series E at a US$48B valuation (Sep 2026).
Browser-based development environment with agents that build and deploy full applications.
Speech synthesis, dubbing and voice agent platform used across media and software.
Creators of the FLUX open-weight image model family, spun out of the Stable Diffusion team.
Multimodal video and 3D generation lab behind Dream Machine and Ray.
Text-to-image model with best-in-class typography rendering.
Fei-Fei Li's large world model company generating navigable 3D scenes.
Model and LoRA sharing hub for the open-weight image generation community.
Domain-specific AI platform for elite law firms and in-house legal teams.
Ambient clinical documentation converting patient conversations into structured notes.
Bret Taylor's conversational agent platform for enterprise customer experience.
AI support agents resolving customer tickets end to end for consumer brands.
Real-time agent coaching and conversation intelligence for large contact centres.
Matrix-style document reasoning used by asset managers and advisory firms.
Managed vector database powering retrieval-augmented generation workloads.
GPU cloud and inference platform specialised in open-model training and serving.
Humanoid robot developer targeting logistics and manufacturing labour.
General-purpose robot brain trained across hardware form factors.
A selection of the firm's best-known non-AI positions, included for context on scale and mandate rather than as a complete list.
Autonomous defence systems and the Lattice command software platform.
Alphabet's robotaxi business; a16z joined its external growth rounds.
The firm's stated view: during a platform shift, value accrues at multiple layers at once, so concentration in a single tier is the real risk. Hence frontier and open-weight labs, GPU and inference infrastructure, data tooling and applications funded in parallel — the mirror image of Conviction's 19 concentrated positions. With ~US$106B under management (March 2026), a16z can afford to back the whole stack.
Because it behaves as a platform, not a partnership: in-house GTM, talent, policy and marketing teams attach to each fund — a structure only US$106B-scale capital can staff. Compare Air Street's single-decision-maker model or NFDG's two partners: a16z trades speed-of-decision for industrialised portfolio services, which is its pitch to founders choosing between a cheque and a platform.
Charter and deployment diverge. a16z is a generalist by charter — seed, venture, growth, crypto, bio and American Dynamism funds — but the dollars concentrate in AI: positions across the largest model labs, the compute layer and hundreds of applications, on ~US$106B AUM. The AI-only specialists are minnows by comparison: Radical reports ~US$2.4B, Gradient ~US$1.2B across five funds.
A hedge stated as a thesis. a16z argues open ecosystems and creator tooling expand the market rather than commoditise it, so it funds Black Forest Labs, Luma, Ideogram, Civitai and Mistral alongside the closed frontier labs. Its Top 100 GenAI Apps research gives the argument distribution — the firm both finances the open-weight option and publishes the data that keeps the debate alive.
Because the round priced the slope, not the snapshot. a16z co-led Cognition's US$2B Series E at US$48B in September 2026, after Devin's run-rate revenue nearly doubled from US$492M to ~US$900M since May — implying roughly 50x annualized revenue. General Catalyst co-led the May Series D and returned for the E: at growth stage, AI cap tables now reshuffle within months.