All 104 companies in Y Combinator's Summer 2015 batch, with team size, growth, open roles and funding.
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 |
|---|---|---|---|---|---|---|
A flexible work app that connects businesses with hourly workers. | 2,747 | +7% | +16% | 2 | $148M | Series D$60M, May 2023 |
The 401(k) for small and medium-sized businesses. | 930 | +12% | +20% | 36 | $915M | Undisclosed round$100M, Oct 2025 |
AI-powered contract management | 868 | +3% | +15% | 1 | $334M | Series E$150M, Jan 2022 |
Provides payment infrastructure for Southeast Asia | 627 | 0% | −2% | 14 | $535M | Series D$300M, May 2022 |
Bluecrew is a web based staffing agency. | 620 | +4% | +10% | 0 | $3.2M | Undisclosed round$2.5M, Jan 2017 |
A learning platform that enables you to train your staff or customers. | 581 | −4% | −10% | YC | $402M | Undisclosed round$30M, May 2023 |
Digital trade finance and B2B commerce company | 444 | +5% | +16% | YC | $578M | Debt$50M, Oct 2025 |
High volume hiring made simple | 425 | +2% | +5% | 14 | $219M | Series C$100M, Jun 2022 |
PartnerStack is a full stack solution for partnerships. | 374 | +5% | +7% | 0 | $36.2M | Series B$28.9M, May 2021 |
| 369 | 0% | +4% | 0 | |||
Modern primary care via video and in-person | 337 | −4% | 4 | $12.5M | Equity crowdfunding$3.5M, Mar 2019 | |
The Infrastructure Identity Company | 329 | +12% | +31% | 6 | $169M | Series C$110M, May 2022 |
The sleep fitness company. | 282 | +17% | +26% | 16 | $302M | Series D$50M, Mar 2026 |
Scentbird is a luxury fragrance subscription service. | 242 | +4% | +10% | 2 | $29.6M | Undisclosed round$820K, Nov 2023 |
The only R&D data cloud for life sciences | 227 | +6% | +32% | 13 | $114M | Undisclosed round$15M, Feb 2026 |
Powers OTT online video providers with video developer tools. | 180 | +8% | +10% | 2 | $95.3M | Debt$3M, Oct 2024 |
Move anything, anytime, anywhere | 179 | +8% | +13% | 1 | $3.9M | Seed$3.8M, Jun 2017 |
The fundraising platform for schools. | 148 | +9% | +18% | 9 | $50M | Private equity$50M, Sep 2022 |
Oolu is one of the fastest growing off-grid solar firms in West Africa | 138 | −1% | −2% | 0 | $14.7M | Debt$300K, Sep 2022 |
An online guide that tells talented graduates how to maximise the… | 121 | +32% | +78% | 0 | $120K | YC investment$120K, Aug 2015 |
We pioneer solutions to end the global housing crisis by empowering… | 119 | −1% | YC | GrantAug 2015 | ||
Build and manage distributed teams | 89 | −1% | −6% | 0 | $32.6M | Series B$20M, Aug 2017 |
Credit cards for Indians that banks cannot see | 88 | 0% | 0% | 0 | $6.6M | Undisclosed round$3.9M, Mar 2019 |
Career advancement for Black, Latinx & Native American professionals. | 83 | +12% | +15% | 0 | $11.9M | Series A$7.5M, Sep 2017 |
Deliver on the Promise of Design | 61 | −21% | 0 | $1.4M | Seed$1.2M, Jul 2016 | |
Workforce Management for Large Farms | 49 | 0% | +4% | 0 | Series BJan 2022 | |
Tesorio is the cash flow performance platform that helps finance… | 44 | +5% | −2% | 0 | $33.9M | Series B$17M, Jul 2022 |
Become the leader your company needs. | 41 | −9% | +5% | 0 | ||
Branch8 helps sellers to list and manage products on e-commerce… | 40 | −2% | YC | Non-equity supportJan 2019 | ||
Long range, wireless energy distribution that scales | 39 | +3% | −5% | YC | $39.1M | Grant$30M, Jun 2026 |
Scope AR is the leading provider of User Guided Augmented Reality… | 38 | −12% | −16% | 0 | $11.8M | Undisclosed round$9.7M, Dec 2022 |
HER helps lesbian, bisexual and queer people meet each other | 37 | −5% | 0 | $2M | YC investment$120K, Aug 2015 | |
Revenue generation for live events | 37 | 0% | −5% | 0 | $3.1M | Seed$2.5M, Jun 2019 |
Rare Disease-Focused Care Delivery and Evidence Generation Platform | 31 | +7% | 0 | $120K | YC investment$120K, Aug 2015 | |
Gemnote is the easiest way to design, create and send custom products. | 28 | +4% | +22% | YC | $120K | YC investment$120K, Aug 2015 |
Hickory turns your employees into experts. | 26 | 0% | −4% | 0 | $3.3M | Series A$3.2M, Jan 2017 |
We use human data and AI to develop better drugs faster. | 26 | −4% | −21% | 2 | $134M | Series C$98M, Oct 2024 |
Xfers makes it possible for people to make and receive payments via… | 26 | −4% | −7% | 0 | $32.6M | Corporate round$30M, Mar 2021 |
Values based personalization at scale for asset and wealth management | 25 | −7% | −31% | 0 | $24.3M | Series A$10.5M, Apr 2020 |
Social Infrastructure for Games; Makers of Nakama game server, Satori… | 24 | 0% | 0% | 0 | $120K | YC investment$120K, Aug 2015 |
Worlds smallest and friendliest café franchise. "The Bike-Powered… | 22 | −4% | 0 | $3.4M | Undisclosed round$944K, Jul 2017 | |
AI-assisted electronics design | 20 | −20% | −43% | 5 | ||
We help residential property managers eliminate vacancy. | 20 | −17% | −13% | 0 | $620K | Seed$120K, Mar 2016 |
Reliable and affordable solar energy in developing countries. | 17 | +6% | +6% | 0 | $120K | YC investment$120K, Aug 2015 |
Icons and social logos for your website. | 17 | 0% | 0% | 0 | $701K | Equity crowdfunding$701K, Nov 2016 |
Predicting and preventing heart disease. | 15 | −6% | −12% | 0 | $15.8M | Series A$11.2M, Aug 2020 |
Autonomous shuttles for campus-like environments. | 15 | 0% | 0% | 0 | $2.2M | Seed$2.1M, Apr 2016 |
We design and manufacture energy efficient LED lighting fixtures for… | 13 | +8% | 0 | $3.1M | Undisclosed round$2M, Apr 2018 | |
Cofactor closes the precision medicine gap with predictive diagnostics | 13 | 0% | +18% | 0 | $28.9M | Undisclosed round$1.2M, Dec 2025 |
Laboratory Information Management System (LIMS) serving… | 12 | 0% | 0% | 0 | $20.4M | Convertible note$1.8M, Apr 2021 |
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).