YC Fall 2026 · 146 companies
Which YC startups are actually taking off?
Every company in the batch, ranked every Monday by traction on X. Every claim links to the post behind it.
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Top 5 this week
This week's Momentum Index
What you get every Monday
The Momentum Index
The top 10, with why each one moved.
Receipts
Traction claims founders posted, linked, and checked that the post says it.
Launches
What shipped this week.
Breakouts
Companies outside the top 5 whose mentions grew fastest.
Demo Day countdown
Days left, and who to meet first.
Receipt
RATLOG: @_charlieweise says RATLOG has '$400M in launch reservations signed.' He says the first engine was hot-fired 4 months in, from a basement, for under $30K. This is a single post with no customers named.
From the sample issue. We report what founders post and say when it's unverified.
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