Get an API keyGet an API keyThe 11 YC S15 companies whose team shrank the most in the last 12 months (active companies that had 20+ people a year ago).
Updated weekly, last on November 9, 2026. Roster from Y Combinator's public directory.
| # | Company | Team | 6 mo | 12 mo | Open roles | Total raised | Last round |
|---|---|---|---|---|---|---|---|
| 1 |  AI-assisted electronics design | 20 | −20% | −43% | 5 | ||
| 2 |  We use human data and AI to develop better drugs faster. | 26 | −4% | −21% | 2 | $134M | Series C$98M, Oct 2024 |
| 3 |  Deliver on the Promise of Design | 61 | −21% | 0 | $1.4M | Seed$1.2M, Jul 2016 | |
| 4 |  A learning platform that enables you to train your staff or customers. | 581 | −4% | −10% | YC | $402M | Undisclosed round$30M, May 2023 |
| 5 |  Revenue generation for live events | 37 | 0% | −5% | 0 | $3.1M | Seed$2.5M, Jun 2019 |
| 6 |  Long range, wireless energy distribution that scales | 39 | +3% | −5% | YC | $39.1M | Grant$30M, Jun 2026 |
| 7 |  Modern primary care via video and in-person | 337 | −4% | 4 | $12.5M | Equity crowdfunding$3.5M, Mar 2019 | |
| 8 |  Branch8 helps sellers to list and manage products on e-commerce… | 40 | −2% | YC | Non-equity supportJan 2019 | ||
| 9 |  Tesorio is the cash flow performance platform that helps finance… | 44 | +5% | −2% | 0 | $33.9M | Series B$17M, Jul 2022 |
| 10 |  Provides payment infrastructure for Southeast Asia | 627 | 0% | −2% | 14 | $535M | Series D$300M, May 2022 |
| 11 |  We pioneer solutions to end the global housing crisis by empowering… | 119 | −1% | YC | GrantAug 2015 |
Every launched company in YC's public directory, with its batch, status, industry and location. New companies show up the week YC lists them.
Each company is matched to Crustdata by its website. Crustdata adds team size and its change over 6 and 12 months, open roles from job postings, reported funding, and founders' past employers.
Hiring the most counts distinct roles posted in the last 60 days. Growth needs 10+ people today, shrinking 20+ a year ago, so tiny teams do not top the lists. Rebuilt every week.
The numbers on this page come from three Crustdata API calls. Crustdata tags 5,000+ companies with Y Combinator as an investor; swap the filter for any investor, industry or headcount range and track your own list, with founders' work emails one call away.
# 1. every company with Y Combinator as an investor curl https://api.crustdata.com/company/search \ -H "authorization: Bearer $CRUSTDATA_API_KEY" \ -H "x-api-version: 2025-11-01" \ -d '{ "filters": { "field": "funding.investors", "type": "in", "value": ["Y Combinator"] }, "fields": ["basic_info.name", "headcount.total", "headcount.growth_percent", "funding.total_investment_usd"], "limit": 100 }' # 2. open listings per company, last 60 days (limit 0 = counts only) curl https://api.crustdata.com/job/search \ -H "authorization: Bearer $CRUSTDATA_API_KEY" \ -H "x-api-version: 2025-11-01" \ -d '{ "filters": { "op": "and", "conditions": [ { "field": "company.basic_info.company_id", "type": "in", "value": [...] }, { "field": "metadata.date_added", "type": "=>", "value": "2026-08-24" } ]}, "limit": 0, "aggregations": [{ "type": "group_by", "field": "company.basic_info.company_id", "agg": "count" }] }' # 3. the same company filter as a weekly watch: POST /watch/company/search
104 companies were in Y Combinator's Summer 2015 batch (S15); 44 are active.
16 companies posted roles in the last 60 days, led by Human Interest (36 roles), Eight Sleep (16 roles) and Fountain (14 roles). 18 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): 80,000 Hours (+32%), Eight Sleep (+17%) and Human Interest (+12%).
Largest latest rounds in the last 12 months, after their YC batch: Eight Sleep ($50M), TetraScience ($15M) and Cofactor Genomics ($1.2M).