How Many Companies Are in Each YC Batch?

If you searched "how many YC companies per batch" or "how many companies in a Y Combinator batch," the answer depends on the year:

• Recent four-batch era (2024–2025): roughly 90–250 companies per named batch in Guide Startups data, with large Summer/Winter cohorts often near 250 and newer Fall/Spring cohorts often 140–170.
• Peak single batches (2021–2022): some Winter/Summer cohorts exceeded 350–400 companies in our directory.
• Total YC alumni in directory: 5,500+ companies across all batches (count updates as new cohorts are added).

YC does not always publish official per-batch headcounts; directory totals reflect companies tagged to each batch in our dataset. For live numbers, open any batch page on Guide Startups.

Company counts per batch from Guide Startups data (snapshot; refresh on /batches):

Four batches per year means annual throughput is the sum of W + X + S + F for that calendar period—not one mega-batch. See batch schedule for season timing.

Historically, the largest single batches in our data cluster around 2021–2022:

• Winter 2022 — ~399 companies
• Summer 2021 — ~391 companies
• Winter 2021 — ~336 companies

Batch size reflects how many startups YC accepted that cycle, plus how completely the cohort is represented in public directories. Spikes often coincide with remote batches, market cycles, and YC's scaling decisions—not a permanent new normal.

Compare eras on /year/2021, /year/2022, and /year/2024.

For most of YC history, two batches per year (Winter and Summer) concentrated volume into fewer, larger cohorts. Search queries like "how many batches per year does Y Combinator run" now resolve to four [1].

Alumni saying "Summer batch" may mean any summer-era cohort; confirm the exact year on the company page. Terminology: what is a YC batch.

Per-batch count answers "how big was W24?" Total alumni answers "how many YC companies exist?"—thousands across 2005–2026.

Implications for founders:

• Competition to get in is global and fierce; batch size does not mean acceptance is easy—acceptance rate is a small fraction of applicants.
• Network size compounds across all alumni, not just your batch.
• Research — studying W24 alone gives ~250 comparables; studying all fintech alumni gives hundreds more on /industries/fintech.

1. Go to /batches — each card shows company count for that cohort.
2. Open a batch slug (e.g. Winter 2024) for the full list.
3. Use year views to aggregate across seasons in a calendar year.
4. Filter by industry inside a batch mentally by scanning tags on company cards.

For search workflows, read search YC companies by founder, tagline, or batch and browse guide.

Acceptance odds are not published per batch and do not correlate simply with batch size—quality of team and idea dominates.

In-batch experience: Larger batches mean more peer founders and Demo Day companies; smaller batches can feel more intimate. Partner attention scales through group office hours and partner assignments, not 1:1 for every team every week.

Fundraising: Demo Day investor attention is shared across the batch; standout companies break out on metrics regardless of cohort size.

How many companies are in each YC batch? Recent major Winter/Summer cohorts often list ~250 companies in Guide Startups; Fall/Spring cohorts often ~90–170; historical peaks near ~400. Four batches per year spread volume across seasons.

Check live totals on /batches, learn codes in YC batch codes decoded, and explore peers in your target batch before you apply.