YC DATA · 6,287 COMPANIES · OCTOBER 2, 2026

EVERY DETECTED FORMATION · 106 TOTAL

All formations

Every startup category this site has detected accelerating or cooling inside Y Combinator’s public company data, in one list. Each one has its own permanent page with the real companies, evidence, and open questions behind it.

Return to Signal

Security

ACCELERATED · WINTER 2026 · 12/757 → 20/654; +1.47 percentage points of formation share. · first surfaced Winter 2026 · source: YC industry

Digital Health

COOLED · WINTER 2026 · 17/757 → 6/654; -1.33 percentage points of formation share. · first surfaced Winter 2026 · source: YC tag

AI Compute Infrastructure

ACCELERATED · WINTER 2026 · 3/748 → 8/649; +0.83 percentage points of formation share. · first surfaced Winter 2026 · source: Description cluster · description-only

Payments

COOLED · WINTER 2025 · 53/1126 → 11/757; -3.25 percentage points of formation share. · first surfaced Winter 2025 · source: YC tag

Aviation and Space

ACCELERATED · WINTER 2025 · 10/1126 → 14/757; +0.96 percentage points of formation share. · first surfaced Winter 2025 · source: YC industry

LegalTech

ACCELERATED · WINTER 2025 · 10/1126 → 14/757; +0.96 percentage points of formation share. · first surfaced Winter 2025 · source: YC tag

Call Center

ACCELERATED · WINTER 2025 · 3/1126 → 6/757; +0.53 percentage points of formation share. · first surfaced Winter 2025 · source: YC tag

Telecommunications

ACCELERATED · WINTER 2025 · 3/1126 → 6/756; +0.53 percentage points of formation share. · first surfaced Winter 2025 · source: YC tag

E-commerce

COOLED · WINTER 2024 · 83/1334 → 19/976; -4.28 percentage points of formation share. · first surfaced Winter 2024 · source: YC tag

Workflow Automation Assistants

ACCELERATED · WINTER 2024 · 11/1328 → 31/964; +2.39 percentage points of formation share. · first surfaced Winter 2024 · source: Description cluster · corroborated

AI Agent Platforms

ACCELERATED · WINTER 2024 · 10/1328 → 19/964; +1.22 percentage points of formation share. · first surfaced Winter 2024 · source: Description cluster · description-only

AI For Finance Ops

ACCELERATED · WINTER 2024 · 5/1328 → 17/964; +1.39 percentage points of formation share. · first surfaced Winter 2024 · source: Description cluster · description-only

LLM Application

ACCELERATED · WINTER 2024 · 5/1328 → 17/964; +1.39 percentage points of formation share. · first surfaced Winter 2024 · source: Description cluster · description-only

Conversational AI

ACCELERATED · WINTER 2024 · 5/1334 → 15/976; +1.16 percentage points of formation share. · first surfaced Winter 2024 · source: YC tag

Search

ACCELERATED · WINTER 2024 · 4/1334 → 10/976; +0.72 percentage points of formation share. · first surfaced Winter 2024 · source: YC tag

Oncology

ACCELERATED · WINTER 2024 · 4/1334 → 9/976; +0.62 percentage points of formation share. · first surfaced Winter 2024 · source: YC tag

Documents

ACCELERATED · WINTER 2024 · 6/1334 → 11/976; +0.68 percentage points of formation share. · first surfaced Winter 2024 · source: YC tag

Retail

COOLED · WINTER 2023 · 32/950 → 14/1297; -2.29 percentage points of formation share. · first surfaced Winter 2023 · source: YC industry

Investing

ACCELERATED · WINTER 2023 · 4/950 → 18/1297; +0.97 percentage points of formation share. · first surfaced Winter 2023 · source: YC tag

Data Analytics Tools

ACCELERATED · WINTER 2023 · 6/936 → 18/1288; +0.76 percentage points of formation share. · first surfaced Winter 2023 · source: Description cluster · description-only

Fintech Payments

ACCELERATED · WINTER 2023 · 2/937 → 16/1288; +1.03 percentage points of formation share. · first surfaced Winter 2023 · source: Description cluster · corroborated

Sales Enablement

ACCELERATED · WINTER 2023 · 3/950 → 16/1297; +0.92 percentage points of formation share. · first surfaced Winter 2023 · source: YC tag

Customer Success

ACCELERATED · WINTER 2023 · 2/950 → 13/1297; +0.79 percentage points of formation share. · first surfaced Winter 2023 · source: YC tag

AI Infrastructure Tools

ACCELERATED · WINTER 2023 · 3/936 → 14/1288; +0.77 percentage points of formation share. · first surfaced Winter 2023 · source: Description cluster · description-only

Cancer Therapeutics

COOLED · WINTER 2023 · 13/936 → 8/1288; -0.77 percentage points of formation share. · first surfaced Winter 2023 · source: Description cluster · corroborated

Electric Vehicle

ACCELERATED · WINTER 2023 · 2/937 → 10/1288; +0.56 percentage points of formation share. · first surfaced Winter 2023 · source: Description cluster · description-only

Search Engine

ACCELERATED · WINTER 2023 · 2/937 → 10/1288; +0.56 percentage points of formation share. · first surfaced Winter 2023 · source: Description cluster · corroborated

Mental Health Tech

ACCELERATED · WINTER 2022 · 6/730 → 18/1334; +0.53 percentage points of formation share. · first surfaced Winter 2022 · source: YC tag

Ecommerce Tools

ACCELERATED · WINTER 2022 · 5/713 → 17/1328; +0.58 percentage points of formation share. · first surfaced Winter 2022 · source: Description cluster · description-only

Emerging Market

ACCELERATED · WINTER 2022 · 5/713 → 16/1328; +0.50 percentage points of formation share. · first surfaced Winter 2022 · source: Description cluster · description-only

Genomics

COOLED · WINTER 2022 · 13/730 → 6/1334; -1.33 percentage points of formation share. · first surfaced Winter 2022 · source: YC tag

Telehealth

ACCELERATED · WINTER 2022 · 3/730 → 13/1334; +0.56 percentage points of formation share. · first surfaced Winter 2022 · source: YC tag

Carbon Emission

ACCELERATED · WINTER 2022 · 3/713 → 12/1328; +0.48 percentage points of formation share. · first surfaced Winter 2022 · source: Description cluster · description-only

Electric Vehicles

ACCELERATED · WINTER 2022 · 4/730 → 12/1334; +0.35 percentage points of formation share. · first surfaced Winter 2022 · source: YC tag

Bank Account

ACCELERATED · WINTER 2022 · 3/714 → 11/1328; +0.41 percentage points of formation share. · first surfaced Winter 2022 · source: Description cluster · description-only

AIOps

COOLED · SPRING 2026 · 18/652 → 6/707; -1.91 percentage points of formation share. · first surfaced Spring 2026 · source: YC tag

Biotech

COOLED · SPRING 2026 · 18/652 → 9/707; -1.49 percentage points of formation share. · first surfaced Spring 2026 · source: YC tag

Advertising

ACCELERATED · SPRING 2026 · 2/652 → 7/707; +0.68 percentage points of formation share. · first surfaced Spring 2026 · source: YC tag

Manufacturing

ACCELERATED · SPRING 2025 · 12/976 → 26/652; +2.76 percentage points of formation share. · first surfaced Spring 2025 · source: YC tag

Hardware

ACCELERATED · SPRING 2025 · 6/976 → 22/652; +2.76 percentage points of formation share. · first surfaced Spring 2025 · source: YC tag

Video

COOLED · SPRING 2025 · 18/976 → 6/652; -0.92 percentage points of formation share. · first surfaced Spring 2025 · source: YC tag

Industrial

ACCELERATED · SPRING 2025 · 2/976 → 12/652; +1.64 percentage points of formation share. · first surfaced Spring 2025 · source: YC tag

Developer Tools

COOLED · SUMMER 2026 · 77/570 → 50/779; -7.09 percentage points of formation share. · first surfaced Summer 2026 · source: YC tag

Voice Agent

COOLED · SUMMER 2026 · 26/564 → 16/777; -2.55 percentage points of formation share. · first surfaced Summer 2026 · source: Description cluster · description-only

Defense

ACCELERATED · SUMMER 2026 · 3/570 → 19/779; +1.91 percentage points of formation share. · first surfaced Summer 2026 · source: YC industry

AI Finance Automation

ACCELERATED · SUMMER 2026 · 6/564 → 19/777; +1.38 percentage points of formation share. · first surfaced Summer 2026 · source: Description cluster · description-only

Drone Defense

ACCELERATED · SUMMER 2026 · 2/564 → 17/777; +1.83 percentage points of formation share. · first surfaced Summer 2026 · source: Description cluster · corroborated

Robotic System

ACCELERATED · SUMMER 2026 · 3/564 → 15/777; +1.40 percentage points of formation share. · first surfaced Summer 2026 · source: Description cluster · description-only

AI Workplace Tools

ACCELERATED · SUMMER 2026 · 4/564 → 14/775; +1.10 percentage points of formation share. · first surfaced Summer 2026 · source: Description cluster · description-only

Vision Model

ACCELERATED · SUMMER 2026 · 3/564 → 7/775; +0.37 percentage points of formation share. · first surfaced Summer 2026 · source: Description cluster · description-only

Operations

COOLED · SUMMER 2025 · 38/990 → 13/570; -1.56 percentage points of formation share. · first surfaced Summer 2025 · source: YC industry

Design

ACCELERATED · SUMMER 2025 · 4/990 → 8/570; +1.00 percentage points of formation share. · first surfaced Summer 2025 · source: YC tag

Crypto / Web3

COOLED · SUMMER 2024 · 45/1359 → 8/990; -2.50 percentage points of formation share. · first surfaced Summer 2024 · source: YC tag

Cross-Border Payments

COOLED · SUMMER 2024 · 38/1353 → 7/977; -2.09 percentage points of formation share. · first surfaced Summer 2024 · source: Description cluster · description-only

Automation

ACCELERATED · SUMMER 2024 · 9/1359 → 34/990; +2.77 percentage points of formation share. · first surfaced Summer 2024 · source: YC tag

AI Agent Infrastructure

ACCELERATED · SUMMER 2024 · 10/1353 → 34/977; +2.74 percentage points of formation share. · first surfaced Summer 2024 · source: Description cluster · description-only

Workflow Automation

ACCELERATED · SUMMER 2024 · 12/1359 → 29/990; +2.05 percentage points of formation share. · first surfaced Summer 2024 · source: YC tag

Finance

ACCELERATED · SUMMER 2024 · 16/1359 → 33/990; +2.16 percentage points of formation share. · first surfaced Summer 2024 · source: YC tag

Generative AI Creative Tools

ACCELERATED · SUMMER 2024 · 8/1353 → 20/977; +1.46 percentage points of formation share. · first surfaced Summer 2024 · source: Description cluster · description-only

Legal Tech Software

ACCELERATED · SUMMER 2024 · 3/1353 → 9/977; +0.70 percentage points of formation share. · first surfaced Summer 2024 · source: Description cluster · description-only

Consumer Health and Wellness

COOLED · SUMMER 2023 · 41/1165 → 17/1126; -2.01 percentage points of formation share. · first surfaced Summer 2023 · source: YC industry

AI Sales Automation

ACCELERATED · SUMMER 2023 · 4/1156 → 29/1117; +2.25 percentage points of formation share. · first surfaced Summer 2023 · source: Description cluster · description-only

Food Delivery

COOLED · SUMMER 2023 · 26/1156 → 8/1117; -1.53 percentage points of formation share. · first surfaced Summer 2023 · source: Description cluster · description-only

Real Estate

ACCELERATED · SUMMER 2023 · 8/1165 → 24/1126; +1.44 percentage points of formation share. · first surfaced Summer 2023 · source: YC tag

AI Insurance Agents

ACCELERATED · SUMMER 2023 · 7/1156 → 19/1117; +1.10 percentage points of formation share. · first surfaced Summer 2023 · source: Description cluster · description-only

Customer Support

ACCELERATED · SUMMER 2023 · 2/1165 → 14/1126; +1.07 percentage points of formation share. · first surfaced Summer 2023 · source: YC tag

Cloud Computing

ACCELERATED · SUMMER 2023 · 4/1165 → 12/1126; +0.72 percentage points of formation share. · first surfaced Summer 2023 · source: YC tag

Cloud Deployment Platform

ACCELERATED · SUMMER 2023 · 7/1157 → 12/1117; +0.47 percentage points of formation share. · first surfaced Summer 2023 · source: Description cluster · description-only

Finance and Accounting

ACCELERATED · SUMMER 2022 · 9/808 → 44/1359; +2.12 percentage points of formation share. · first surfaced Summer 2022 · source: YC industry

Neobank

ACCELERATED · SUMMER 2022 · 4/808 → 29/1359; +1.64 percentage points of formation share. · first surfaced Summer 2022 · source: YC tag

Asset Management

ACCELERATED · SUMMER 2022 · 3/808 → 19/1359; +1.03 percentage points of formation share. · first surfaced Summer 2022 · source: YC industry

Social

COOLED · SUMMER 2022 · 17/808 → 6/1359; -1.66 percentage points of formation share. · first surfaced Summer 2022 · source: YC industry

Data Analytics Platform

ACCELERATED · SUMMER 2022 · 2/792 → 12/1353; +0.63 percentage points of formation share. · first surfaced Summer 2022 · source: Description cluster · description-only

Healthcare Software

ACCELERATED · SUMMER 2022 · 4/792 → 12/1353; +0.38 percentage points of formation share. · first surfaced Summer 2022 · source: Description cluster · description-only

Investment Platforms

ACCELERATED · SUMMER 2022 · 2/791 → 11/1353; +0.56 percentage points of formation share. · first surfaced Summer 2022 · source: Description cluster · description-only

Precision Medicine

COOLED · SUMMER 2022 · 11/792 → 10/1353; -0.65 percentage points of formation share. · first surfaced Summer 2022 · source: Description cluster · description-only

Carbon Capture

ACCELERATED · SUMMER 2022 · 2/792 → 9/1353; +0.41 percentage points of formation share. · first surfaced Summer 2022 · source: Description cluster · description-only

Security Infrastructure Tools

ACCELERATED · SUMMER 2022 · 2/791 → 9/1353; +0.41 percentage points of formation share. · first surfaced Summer 2022 · source: Description cluster · description-only

Data Engineering

ACCELERATED · SUMMER 2021 · 8/647 → 29/1165; +1.25 percentage points of formation share. · first surfaced Summer 2021 · source: YC tag

Therapeutics

COOLED · SUMMER 2021 · 22/647 → 18/1165; -1.86 percentage points of formation share. · first surfaced Summer 2021 · source: YC industry

Health & Wellness

ACCELERATED · SUMMER 2021 · 3/647 → 19/1166; +1.17 percentage points of formation share. · first surfaced Summer 2021 · source: YC tag

Telemedicine

ACCELERATED · SUMMER 2021 · 3/647 → 15/1165; +0.82 percentage points of formation share. · first surfaced Summer 2021 · source: YC tag

Online Learning

ACCELERATED · SUMMER 2021 · 4/633 → 14/1157; +0.58 percentage points of formation share. · first surfaced Summer 2021 · source: Description cluster · description-only

Video Chat

ACCELERATED · SUMMER 2021 · 2/633 → 9/1157; +0.46 percentage points of formation share. · first surfaced Summer 2021 · source: Description cluster · corroborated

Creator Economy

ACCELERATED · SUMMER 2021 · 3/647 → 11/1165; +0.48 percentage points of formation share. · first surfaced Summer 2021 · source: YC tag

Diagnostic Testing

ACCELERATED · SUMMER 2021 · 3/633 → 11/1156; +0.48 percentage points of formation share. · first surfaced Summer 2021 · source: Description cluster · description-only

Engineering, Product and Design

COOLING · 95/622 → 57/739; -7.56 percentage points of formation share. · first surfaced Fall 2026 · source: YC industry

Infrastructure

ACCELERATING · 38/622 → 79/739; +4.58 percentage points of formation share. · first surfaced Fall 2026 · source: YC industry

Manufacturing and Robotics

ACCELERATING · 31/622 → 58/739; +2.86 percentage points of formation share. · first surfaced Fall 2026 · source: YC industry

Hard Tech

ACCELERATING · 17/622 → 41/739; +2.81 percentage points of formation share. · first surfaced Fall 2026 · source: YC tag

AI Agents

COOLING · 32/615 → 22/739; -2.23 percentage points of formation share. · first surfaced Fall 2026 · source: Description cluster · description-only

Robotics Companies

ACCELERATING · 12/615 → 25/739; +1.43 percentage points of formation share. · first surfaced Fall 2026 · source: Description cluster · description-only

Drone Technology

ACCELERATING · 4/615 → 18/739; +1.79 percentage points of formation share. · first surfaced Fall 2026 · source: Description cluster · description-only

Drug Discovery

ACCELERATING · 3/615 → 8/739; +0.59 percentage points of formation share. · first surfaced Fall 2026 · source: Description cluster · description-only

Supply Chain and Logistics

COOLED · FALL 2025 · 22/810 → 12/622; -0.79 percentage points of formation share. · first surfaced Fall 2025 · source: YC industry

Reinforcement Learning

ACCELERATED · FALL 2025 · 5/810 → 16/622; +1.96 percentage points of formation share. · first surfaced Fall 2025 · source: YC tag

GovTech

ACCELERATED · FALL 2025 · 6/810 → 9/622; +0.71 percentage points of formation share. · first surfaced Fall 2025 · source: YC tag

Data Labeling

ACCELERATED · FALL 2025 · 3/810 → 6/622; +0.59 percentage points of formation share. · first surfaced Fall 2025 · source: YC tag

Healthcare Agents

ACCELERATED · FALL 2024 · 11/1288 → 31/802; +3.01 percentage points of formation share. · first surfaced Fall 2024 · source: Description cluster · description-only

Healthcare Operations AI

ACCELERATED · FALL 2024 · 14/1288 → 30/802; +2.65 percentage points of formation share. · first surfaced Fall 2024 · source: Description cluster · description-only

Video Infrastructure

ACCELERATED · FALL 2024 · 8/1288 → 15/802; +1.25 percentage points of formation share. · first surfaced Fall 2024 · source: Description cluster · corroborated

Legal

ACCELERATED · FALL 2024 · 4/1297 → 12/810; +1.17 percentage points of formation share. · first surfaced Fall 2024 · source: YC tag

Aerospace

ACCELERATED · FALL 2024 · 8/1297 → 13/810; +0.99 percentage points of formation share. · first surfaced Fall 2024 · source: YC tag

Big Data

ACCELERATED · FALL 2024 · 4/1297 → 9/810; +0.80 percentage points of formation share. · first surfaced Fall 2024 · source: YC tag

Web Data API

ACCELERATED · FALL 2024 · 5/1288 → 9/802; +0.73 percentage points of formation share. · first surfaced Fall 2024 · source: Description cluster · description-only

Databases

ACCELERATED · FALL 2024 · 3/1297 → 8/810; +0.76 percentage points of formation share. · first surfaced Fall 2024 · source: YC tag