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Y Combinator Top Companies List - 2018
A comprehensive directory of the 100 highest-valued Y Combinator companies as of October 2018, plus their top 12 exits
verified Jul 12, 2026 · HTTP 200
CohortClass of 2018What it is
A comprehensive directory of the 100 highest-valued Y Combinator companies as of October 2018, plus their top 12 exits. Designed to showcase the fastest-growing and most successful alumni from the YC community.
HTTP liveness
9 probes since Jun 16Jun 16Jul 12
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jun 16, 2026First probe — liveAlive · 200 OK
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Pulse Indexobserved activity
9 probes0 pressGitHub –Tranco –
Not enough observed signals for a Pulse Index (needs 2+ signal families).
Cohort survival · Class of 2018weekly
2,435 products launched in 2018 · 100% still active
2,425 active10 sunset
Still active
100%
Median lifespan
4.9y