Y Combinator | Activity | F4

Y Combinator Activity

Every public signal F4 has attached to this firm, with sources and cross-entity links.

Types

Time range

Team Change

Vivian Midha Shen (Juni Learning W18, Acely founder) and Raphael Schaad (Cron W20, acquired by Notion) join Y Combinator as General Partners, having served as Visiting Partners for the last two batches.

Y Combinator

Y CombinatorY Combinator

ycombinator.comOCT 1, 2026

OCT 1, 2026

Milestone

AfterQuery became YC's fastest unicorn ever at a $3.2 billion valuation, as reported by Forbes.

Afterquery

Afterquery Y Combinator

forbes.comSEP 1, 2026

SEP 1, 2026

Milestone

YC-backed Blacksmith raised $45M Series B at $550M valuation (up from $60M less than a year ago). Y Combinator participated alongside Peak XV Partners and GV. The AI code-testing startup serves 5,000+ customers.

Blacksmith

Blacksmith Y Combinator

techcrunch.comAUG 12, 2026

AUG 12, 2026

Team Change

Diana Hu (Escher Reality S17, acquired by Niantic) promoted to Managing Partner at Y Combinator. She has worked with nearly 230 companies across 18 batches, logged over 2,100 office hours, and those companies are now worth a combined $7 billion.

Y Combinator

Y CombinatorY Combinator

ycombinator.comJUN 11, 2026

ycombinator.com

JUN 11, 2026

Exit

Stack AI was acquired by Asana for $75M to expand AI agent orchestration capabilities across enterprise systems.

Stack AI

Stack AI Y Combinator

techcrunch.comMAY 28, 2026

MAY 28, 2026

Essay

Published Summer 2026 Requests for Startups marking a significant pivot toward hard tech and AI-enabled physical industries including robotics, space, defense, and semiconductors.

Summer 2026 Requests for Startups

Y Combinator

thenextweb.comMAY 2026

MAY 2026

News

YC began offering $500K investments in USDC stablecoins across Ethereum, Base, and Solana, treating blockchain rails as first-class funding citizens.

USDC stablecoin funding option for YC startups

Y Combinator

ycombinator.com

Added recently

Exit

Meta acquired 49% stake in portfolio company Scale AI for over $14B, validating AI data infrastructure value.

Scale AI

Scale AIY Combinator

ycombinator.com

Added recently

Team Change

Harshita Arora, co-founder of AtoB (YC S20, Series-C fintech for trucking), joins YC as a General Partner. She was the youngest visiting partner in YC's history since Summer 2025.

Y Combinator

Y CombinatorY Combinator

ycombinator.comAPR 6, 2026

APR 6, 2026

Team Change

Harshita Arora joined Y Combinator as General Partner, bringing deep fintech and infrastructure expertise and founder experience from co-founding AtoB (YC S20).

Harshita Arora joined as General Partner

Y Combinator

ycombinator.comAPR 6, 2026

APR 6, 2026

News

Announced that all YC founders can now receive $500K investments in USDC stablecoins across Ethereum, Base, and Solana.

USDC Stablecoins Funding Support

Y Combinator

fortune.comFEB 3, 2026

FEB 3, 2026

News

Y Combinator began offering founders the option to receive their $500K investment in USDC stablecoins across Ethereum, Base, and Solana.

USDC Stablecoin Funding Option

Y Combinator

fortune.comFEB 2026

FEB 2026

Essay

YC published Spring 2026 Requests for Startups emphasizing AI replacement over augmentation: autonomous hedge funds, AI-native agencies, software-run factories, and AI for government automation.

YC's 2026 Roadmap: AI-Native Companies Replacing Humans

Y Combinator

forbes.comFEB 2026

FEB 2026

Exit

EquipmentShare (YC W15), a construction equipment marketplace and jobsite operating system, went public. The company grew from rural Missouri to 373 locations nationwide.

EquipmentShare

EquipmentShare Y Combinator

ycombinator.comJAN 23, 2026

JAN 23, 2026

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