27 Y Combinator companies with a founder who worked at Jane Street before.
Updated weekly, last on November 9, 2026. Roster from Y Combinator's public directory.
| Company | Batch | Team | 6 mo | 12 mo | Open roles | Total raised | Last round |
|---|---|---|---|---|---|---|---|
America's #1 Sports Trading App | S22 | 98 | +72% | +165% | 9 | $99.9M | Series B$75M, Feb 2026 |
AI Time Platform for Law Firms | W24 | 42 | +100% | +320% | 9 | $19.6M | Series A$16M, Mar 2026 |
Py is democratizing access to career opportunities in tech | S17Acquired | 38 | −3% | −3% | 0 | $120K | YC investment$120K, Aug 2017 |
Modernizing the police workflow. | X25 | 17 | −26% | +31% | YC | $2.7M | Seed$2.7M, Jun 2025 |
Tinder for jobs | F25 | 15 | +7% | 0 | $500K | YC investment$500K, Dec 2025 | |
AI tutors for exam prep | W25 | 10 | +67% | YC | $500K | YC investment$500K, Mar 2025 | |
Trade Anything | F25 | 9 | +29% | +80% | 0 | $2.5M | Seed$2M, Nov 2025 |
Modular AI-Commanded Drones for Defence | W26 | 7 | YC | $500K | YC investment$500K, Apr 2026 | ||
Intelligent Medical Record Reviews | W24 | 7 | −12% | −12% | 0 | $500K | YC investment$500K, Apr 2024 |
Agentic Mortgage Origination | W26 | 4 | YC | $4.6M | Seed$4.1M, Jun 2026 | ||
Powerful quantitative forecasting models | S24 | 4 | −33% | 0 | |||
Engineering next-generation, brain-penetrant cancer therapies. | W18Inactive | 4 | 0 | $25M | Series A$25M, Feb 2021 | ||
Predictive maintenance for power infrastructure. | F26 | 3 | 0 | ||||
Physics-based foundation models for CAD optimization. | S25 | 3 | 0 | $500K | YC investment$500K, Sep 2025 | ||
AI travel planner | S24 | 3 | YC | $500K | YC investment$500K, Dec 2025 | ||
The customer brain that connects data to explain customer behavior | S26 | 2 | 0 | ||||
We are a multi-strategy trading firm that trains AI traders. | S26 | 2 | 0 | ||||
Helping your company find 10x engineers. | X26 | 2 | 0 | ||||
Trade with superhuman instinct | W26 | 2 | 0 | ||||
Agents for quantitative research and financial data science. | S24 | 2 | 0 | ||||
Helping Companies Deploy Email Agents in High Trust Domains | W24 | 2 | 0 | ||||
Custom video detection models in less than 5 minutes | W24 | 2 | 0 | $500K | YC investment$500K, Mar 2024 | ||
Learn language with real-world content, at your level | S23 | 2 | 0 | Pre-seedOct 2023 | |||
AI-Native Medical Billing Services | W26 | 1 | 0 | $500K | YC investment$500K, Mar 2026 | ||
Fast and Safe OpenClaw on the cloud | W26Inactive | 1 | 0 | ||||
Grammarly for Math ✏️ | X25 | 1 | 0 | $500K | YC investment$500K, Jun 2025 | ||
AI search for massive PDFs | W24Inactive | 1 | 0 | $500K | YC investment$500K, Apr 2024 |
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
27 Y Combinator companies have a founder who worked at Jane Street; 23 are active.
2 companies posted roles in the last 60 days, led by PointOne (9 roles) and Novig (9 roles). 7 mark themselves as hiring on YC's directory.
By team growth over 6 months (10+ people): PointOne (+100%), Novig (+72%) and Miyagi Labs (+67%).
Largest latest rounds in the last 12 months, after their YC batch: Novig ($75M), PointOne ($16M) and Copperlane ($4.1M).