All 45 companies in Y Combinator's Winter 2011 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 |
|---|---|---|---|---|---|---|
Platform for the greatest products from the past, present and future. | 926 | −5% | −6% | 25 | $493M | Undisclosed round$195M, Apr 2022 |
The cloud-native, operational database built for speed and scale. | 565 | +3% | +2% | 14 | $464M | Series F$30M, Oct 2022 |
How businesses send money to people at scale. Fast, free, global. | 221 | +10% | +33% | 2 | SeedMar 2011 | |
CRM and sales automation suite | 216 | +1% | +6% | 2 | SeedJan 2013 | |
Email API service. | 188 | −2% | −3% | 0 | $51.1M | Private equity$50M, Feb 2017 |
Zerocater is revolutionizing how companies feed their employees | 161 | −1% | −5% | 5 | $37.9M | Series C$15M, Feb 2023 |
Customer loyalty and payments platform for small businesses. | 126 | −1% | 0 | $144M | Series D$52.2M, Oct 2020 | |
The essential platform for modern medical practices and patients. | 122 | −6% | −10% | 0 | $60.7M | Undisclosed round$12M, Jun 2021 |
Turning PhDs & engineers into data scientists & data engineers | 79 | −6% | −5% | 0 | $11M | Series B$11M, Feb 2018 |
Pay what you want for awesome games and other content while giving to… | 63 | +3% | +5% | 0 | $4.5M | Undisclosed round$4.5M, Apr 2011 |
Online store referrals. | 44 | −14% | −27% | 0 | $4.2M | Undisclosed round$3M, Jun 2017 |
eSignature software for small and mid-market businesses. | 14 | 0% | 0% | 0 | $16M | Series B$16M, Jun 2017 |
The future of hardware design. A marketplace for hardware engineering… | 11 | −8% | −8% | 0 | $2.4M | Seed$2.4M, Jul 2013 |
Record your family stories and print them in beautiful keepsake books. | 10 | 0% | +11% | 0 | $150K | Seed$150K, Sep 2014 |
Watch that helps you get shit done and limit the mayhem of… | 7 | −12% | −12% | 0 | ||
All-in-one apartment Marketing Platform for brokerages and landlords. | 5 | 0% | 0% | 0 | $150K | YC investment$150K, Mar 2011 |
Ebook publisher. | 4 | 0 | $1.2M | Seed$1.2M, Oct 2011 | ||
Tumult is building the next generation of apps for web design. Our… | 3 | 0 | SeedMar 2011 | |||
Order ahead for pickup | 3 | 0 | $10.5M | Series A$8M, Dec 2013 | ||
Google AdWords for music. Allowing bands and labels to bid for… | 2 | 0 | $1.7M | Angel$1.7M, Jan 2012 | ||
Custom-made artwork from artists e-commerce marketplace. | 2 | 0 | SeedMar 2011 | |||
Custora is a predictive analytics platform for e-commerce marketing… | 2 | 0 | $21.2M | Series B$13.8M, Sep 2018 | ||
IMDB of conferences. | 2 | 0 | $1.4M | Seed$1.4M, Sep 2011 | ||
Facebook stores. | 1 | 0 | SeedApr 2011 | |||
iOS porting | 1 | 0 | $11.4M | Seed$2.5M, Dec 2014 | ||
Mobile games company | 1 | YC | ||||
User retention as a service. Drip email | 0 | $700K | Angel$700K, Feb 2013 | |||
Fashion shopping email list. | ||||||
Google Voice for business. | ||||||
Pivoted to TenXList, a professional network of top college engineers. | ||||||
New projects | 0 | $400K | YC investment$400K, Jan 2011 | |||
.NET Cloud Platform as a Service | 0 | SeedMar 2011 | ||||
High speed peer to peer data transport technology for consumers… | ||||||
Real-time analytics (acq by TWTR, 2012) | ||||||
SaaS to increase speed and quality of clinical trials. | 0 | |||||
Hosted IRC and so much more. | ||||||
Third generation of web apps. | 0 | |||||
Payments for Marketplaces | ||||||
Online tutoring marketplace. | ||||||
Trust funds. | 0 | $1.1M | Seed$1M, Dec 2013 | |||
Siasto is a collaboration tool designed for SMBs who use Google Apps,… | ||||||
Consumer to business messaging. | ||||||
Venue marketplace. | ||||||
Sell your stuff. |
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
45 companies were in Y Combinator's Winter 2011 batch (W11); 12 are active.
5 companies posted roles in the last 60 days, led by GOAT Group (25 roles), SingleStore (14 roles) and Zerocater (5 roles). 2 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): Tremendous (+10%), SingleStore (+3%) and Close (+1%).
No reported rounds after their YC batch in the last 12 months.