Company research · 47 profiles

YC Winter 2026 companies

A selected Winter 2026 YC company sample organized for founders comparing adjacent products, buyers, and public evidence.

By Ali Abouelatta
Published Sep 19, 2026

Read as Markdown

All approved published company profiles with exact recorded program and cohort membership.

Every member carries the exact public cohort label Winter 2026; use the company summaries to compare products, buyers, and language within that batch.
This is a selected researched sample, not a claim that the page contains every company originally funded in Winter 2026.

B2B
/dev/fast
Open-source code review for understanding architecture, diffs, and agent trajectories.
Y Combinator Winter 2026
B2B · Analytics
Constellation Space
Constellation Space provides a telemetry, forecasting and policy-controlled action layer for mixed-vendor satellite fleets.
Y Combinator Winter 2026
Developer Tools · Artificial Intelligence · Frontend Infrastructure
21st
21st.dev pairs a large React component registry with an Agents SDK for shipping persistent frontier-agent experiences to users.
Y Combinator Winter 2026
B2B · Finance and Accounting
Balance
Balance keeps SMB books current with AI agents and named accountants who own the judgement and sign-off.
Y Combinator Winter 2026
B2B · Infrastructure
Autumn AI
A live public-web research and enrichment layer for teams that need changing signals and provenance rather than static database rows.
Y Combinator Winter 2026
Real Estate / Construction
AutoSitu
The AI operating system for the built world
Y Combinator Winter 2026
B2B · Marketing
Sitefire
AI-search visibility, content, citation, and referral analytics for marketing teams.
Y Combinator Winter 2026
B2B · Operations
Bubble Lab
Bubble Lab turns event attendance and community operations into relationship context, matchmaking and recurring workflows.
Y Combinator Winter 2026
Artificial Intelligence · Workflow Automation · Productivity
Cofia
Cofia says it learns repetitive internal work from system events and proposes reviewed automations for tasks such as outreach, recruiting and reporting.
Y Combinator Winter 2026
B2B · Recruiting and Talent
Perfectly
Perfectly applies recommendation-system thinking to recruiting, with an AI agent for sourcing, outreach and screening.
Y Combinator Winter 2026
B2B · Sales
Caretta
A call-side sales intelligence layer whose value depends on technical objection volume, trusted source content and disciplined action controls.
Y Combinator Winter 2026
AI / Identity / Security
Agentic Fabriq
The control plane for AI agents.
Y Combinator Winter 2026
B2B · Supply Chain and Logistics
Burt
AI teammates that handle repetitive freight-broker tasks while escalating exceptions.
Y Combinator Winter 2026
Consumer · Education
Doomersion
Doomersion uses a short-form video feed to make comprehensible language immersion more repeatable for mobile learners.
Y Combinator Winter 2026
Consumer · Fitness · Wearables
Fort
Fort targets strength-focused consumers with a screen-free wearable, training plans and a pre-order device/software offer.
Y Combinator Winter 2026
Consumer · Gaming
CatchBack Cards
A collectible-pack and resale platform whose strongest trust claim is verifiable pack construction, while fulfillment and buyback terms remain the buyer’s diligence points.
Y Combinator Winter 2026
Fintech · Banking and Exchange
Fenrock AI
Back-office AI agents for banks that work across existing systems and internal policies.
Y Combinator Winter 2026
Fintech · Payments
SpotPay
SpotPay targets cross-border consumers with one verified wallet, local/international transfers and a global card.
Y Combinator Winter 2026
Fintech · Mortgage · Artificial Intelligence
Copperlane
Copperlane presents Penny as an AI mortgage-intake assistant that turns borrower conversations and documents into reviewable loan files.
Y Combinator Winter 2026
Fintech · Insurance
Panta
A licensed commercial brokerage for hard-to-place operators, with AI handling coordination while brokers retain coverage judgment.
Y Combinator Winter 2026
Fintech / Crypto Payments
Unifold
Multi-chain deposit and payment infrastructure
Y Combinator Winter 2026
Healthcare
Beacon Health
EHR-native AI operations for primary-care and value-based-care organizations.
Y Combinator Winter 2026
Healthcare · Consumer Health and Wellness
Prana
Prana combines free AI health chat, record/wearable monitoring and $39 human doctor visits in an early beta care model.
Y Combinator Winter 2026
Biotech · Artificial Intelligence · Drug Discovery
CellType
CellType describes an agentic drug company built on biological foundation models that simulate human biology for discovery and translational work.
Y Combinator Winter 2026
Healthcare · Healthcare IT
Mango Medical
An early orthopedic planning partner whose value depends on traceable imaging-to-plan workflows, clinician review and regulatory progress.
Y Combinator Winter 2026
Healthcare / Revenue Cycle
ClaimGlide
AI automated prior-auths for private medical practices
Y Combinator Winter 2026
Industrials
ARC Prize Foundation
Open benchmarks, competitions, grants, and research community for general and agentic intelligence.
Y Combinator Winter 2026
Industrials · Aviation and Space
AxionOrbital Space
AxionOrbital targets continuous visibility for defense, disaster response and agriculture by turning SAR signals into usable optical imagery.
Y Combinator Winter 2026
Aquaculture · Computer Vision · Robotics · Agriculture
OctaPulse
OctaPulse targets manual fish-farm QA with vision-based grading, phenotyping and a path toward automated sorting and broader aquaculture operations.
Y Combinator Winter 2026
Industrials · Defense
DAIVIN!
A deep-tech breathing-equipment project whose tankless diving concept remains gated by independent safety validation, certification and fallback procedures.
Y Combinator Winter 2026
Defense / Airspace Security
Milliray
Technology to detect and track small drones
Y Combinator Winter 2026
Industrials · Energy
Condor Energy
Energy strategy software for large electricity consumers managing risk, cost, and investment.
Y Combinator Winter 2026
B2B
10x Science
An early AI drug-development platform focused on the protein-characterization bottleneck between experimental data and candidate advancement.
Y Combinator Winter 2026
Artificial Intelligence · R&D · Engineering
Aemon
Aemon describes a forward-deployed research engineer that locks an eval, explores many approaches and returns validated technical improvements.
Y Combinator Winter 2026
B2B
Ashr
Ashr helps teams turn production traces and corrections into eval sets, specialist models and continually improving model infrastructure.
Y Combinator Winter 2026
B2B
Avoice
An architecture workspace connecting specs, QA/QC, delivery, practice operations, and project knowledge.
Y Combinator Winter 2026
B2B / Dynamic Pricing
Booko
Dynamically pricing the whole economy.
Y Combinator Winter 2026
B2B
Byteport
A large-file transport layer for teams that need measurable speed and reliability across high-latency, air-gapped or mission-critical networks.
Y Combinator Winter 2026
Artificial Intelligence · Formal Verification · Scientific Computing
Cajal
Cajal describes Tau and Lean-based formalization for applied mathematics, quantum computing, finance and AI research, alongside the Talos open-source interpreter.
Y Combinator Winter 2026
B2B
Cardboard
Cardboard gives growth and marketing teams an agentic timeline editor for finding moments, making first cuts and shipping multi-format video.
Y Combinator Winter 2026
B2B / AI FinOps
Carrot Labs
AI Cost Management: Track and attribute AI spend across every provider
Y Combinator Winter 2026
B2B
Chasi
An equipment-industry revenue and utilization layer for dealers that need faster response, less admin work and better fleet coordination.
Y Combinator Winter 2026
B2B
Confluence Labs
An early research lab applying learning efficiency and program synthesis to domains where physical experiments are expensive and sparse.
Y Combinator Winter 2026
Artificial Intelligence · Developer Infrastructure · Safety
Envariant
Envariant positions its interpretability SDK as an upstream control layer for foundation-model hallucinations, invariants, steering and edge cases.
Y Combinator Winter 2026
B2B
InventoryQuant
InventoryQuant automates contents inventories, replacement pricing and report formatting for adjusters and insurance operations.
Y Combinator Winter 2026
B2B
Jinba
Chat-built enterprise workflow automation with visual review, APIs, MCP, governance, and on-prem options.
Y Combinator Winter 2026
Hospitality / AI Agents
Lance
AI Agents That Run Hotel Operations.
Y Combinator Winter 2026

How this collection was assembled

Includes all of our approved published profiles with recorded Y Combinator Winter 2026 membership. This remains a researched subset of the public program roster, not a complete intake list or a quality ranking.

How this collection was assembled

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