Fueling the Future of Innovation
Rebel aims to invest in the top 10% of startups (top 0.06% of applicants) from Y Combinator, the #1 accelerator in the world with 100+ unicorns and $1.3T+ in portfolio company value.
Serif Health
YC W22Healthcare price transparency infrastructure
Scanbase
YC W23Diagnostic test results from a photo
Milio
YC W23Global money movement in seconds
Veles
YC W24The deal execution platform
Infinia
YC W23Linking banks with digital assets
Wattson Health
YC S23AI patient access & engagement
Reform
YC W24AI automation for freight & logistics
Trigger.dev
YC W23Open-source AI workflows in TypeScript
Untether Labs
YC W23AI workforce management for healthcare
PartnerHQ
YC W24Where tech partnerships get made
Cedalio
YC S23AI agents for accounts payable
01 — About Us
Built by founders. Powered by data.
Rebel’s investing partners are accomplished Y Combinator alumni who have co-founded companies now valued at over $100B in aggregate — including Reddit, Instacart, Cruise, Gusto, Scribd, Rappi, and more — and together invested in over 325 startups with top-decile portfolio returns.
Rebel has unique access to top Y Combinator startups with a nearly 100% deal win rate, typically pre-Demo Day. The fund utilizes a proprietary machine-learning algorithm called Rebel Theorem 5.0 to help validate and screen potential investments, building a diversified portfolio of Y Combinator startups that is statistically powered to outperform.
- $100B+
- aggregate value of companies co-founded by Rebel partners
- 325+
- investments in Y Combinator startups to date
- ~100%
- deal win rate, typically pre-Demo Day
- 5.0
- Rebel Theorem — our ML selection model
Since Batch One
Rebel's team spans Y Combinator's history from its very first batch — and the fund has backed startups in every batch since Summer 2019.
Rebel Investments per BatchRebel Partners' Batches
02 — YC Alumni
Rebel Partners
Rebel’s investments are led by a team of top Y Combinator alumni who have co-founded companies now valued at over $100B in aggregate.
Steve Huffman
RedditYC S05
Daniel Kan
CruiseYC W14
Max Mullen
InstacartYC S12
Trip Adler
ScribdYC S06
Jonathan Hirsch
ParadigmNon-YC biotech partner
Sebastian Mejia
RappiYC W16
Dan Siroker
OptimizelyYC W10
Josh Reeves
GustoYC W12
Tomer London
GustoYC W12
Edward Kim
GustoYC W12
03 — The Team
Rebel Leadership
Our leadership team is composed of dedicated professionals with backgrounds in investing, business, law, finance, computer science and account management.
04 — In the Press
Portfolio News
Recent headlines from across the Rebel portfolio.
- Vitalize Raises $31M Series A to Bring “Air Traffic Control” to Healthcarebusinesswire.com
- Hop Aero Raises $11M for Suborbital Point-to-Point Deliverypayloadspace.com
- Jeeves bags $110m to scale stablecoin banking platformfintech.global
- Venn Acquires Zuma For $50 Million To Expand AI Platform Across Nearly One Million Homespulse2.com
- VideoGen Raises $3.3M in Seed Fundingfinsmes.com
- PayNearMe Acquires Marr Labs to Accelerate AI Innovation Across the End-to-End Payment Experienceprnewswire.com
- Metal Raises $4.5M to Build the OS for Capital Formationmetal.so
- Multiplier Raises USD6M in Seed Fundingfinsmes.com
- Axle raises $17.5M for insurance data clearinghouseaxios.com
- Dili Raises $21.7 Million From Khosla Ventures To Bring AI-Powered Assurance To America’s Infrastructure Boompulse2.com
05 — Essays
Knowledge Sharing
Data-driven essays on Y Combinator investing by Jared Heyman, Managing Partner.
On how to invest in venture
I’ve been a full-time venture capitalist for nearly a decade and seeded hundreds of top Y Combinator startups at Rebel Fund, now valued collectively in the tens of billions. So I’m often asked by other investors about how to get into venture investing. Since technology companies now dominate the S&P 500, there’s more interest than ever in getting into tomorrow’s trillion-dollar tech companies early, and for good reason — where else can you enjoy a 1000x+ return on a single good investment?
Read on Medium
On why to ignore TechCrunch at YC Demo Day
I’ve always found it curious that TechCrunch publishes articles around every Y Combinator Demo Day with titles like “16 of the most interesting startups from YC W26 Demo Day”. Apparently thousands of investors read these articles, but are journalists really in a position to tell them which YC startups will become tomorrow’s unicorns?
Read on Medium
On the YC S26 batch — Return of the Atoms
I’ve been to nearly every Y Combinator Demo Day since my own in 2013, so people often ask me what each new batch feels like in terms of trends and quality. Since Rebel Fund invests in hundreds of expensive YC startups and maintains the world’s largest database of YC startups, founders, and outcomes outside of YC itself, I prefer to answer that question with data. So here we go for the S26 batch!
Read on Medium
On why you should invest in the most expensive YC startups
Rebel Fund invests in the top 10% of Y Combinator startups, with a portfolio of now 300+ companies valued collectively in the tens of billions. Along the way, we’ve invested millions into building the most comprehensive dataset of YC startups, founders, and outcomes that exists outside of YC itself, with millions of datapoints across every YC batch in history. We use this data primarily to train our proprietary Rebel Theorem 5.0 ML/AI model to predict YC startup success, but it’s also helped me publish dozens of data-driven posts answering interesting questions about YC startup investing. Today we’ll dive into whether the most expensive YC startups in each batch are worth the premium.
Read on Medium
On Rebel Theorem 5.0
We’ve also invested millions of dollars into developing the world’s most sophisticated ML/AI algorithm for predicting YC startup success at the pre-Demo Day stage. I’ve written about our various algorithm iterations over the years, most recently Rebel Theorem 4.0 and our new AI composite scores, and now I’m pleased to announce Rebel Theorem 5.0.
Read on Medium
On what actually predicts YC startup success
Since Rebel Fund invests exclusively in seed-stage Y Combinator startups, the dozens of blog posts I’ve published over the years are largely focused on what separates the future YC unicorns from the rest of the pack. As my long-time readers know, Rebel maintains the most comprehensive database of YC startups, founders, and outcomes that exists outside of YC itself, and we use the millions of data points we’ve collected to train our proprietary Rebel Theorem ML algorithm to predict which YC startups are most likely to deliver outsized investor returns.
Read on Medium
06 — Life at Rebel
Event Photos
07 — Founder Voices
Testimonials
What founders say about working with Rebel.
Rebel's virtual sessions and programming are a great differentiator vs. other funds.
Rafiq Ahmed
Serif Health
I really appreciate that Rebel consistently delivers useful and relevant materials and webinars.
Jeffrey Lange
Scanbase
Rebel Fund is the only fund consistently hosting relevant webinars that genuinely impact our journey as startup founders—reminiscent, in many ways, of the support we experienced during our YC Batch.
Juan Luis Pérez
Milio
I thought the process was incredibly smooth. I also loved that Eddie [from Rebel] was already prepped and came to the call with great questions/context/etc. I would highly recommend Rebel to every other YC Founder.
Simon Ooley
Veles
I only have great words about both the investing process and the support from Rebel so far.
Ianai Urwicz
Infinia
We're really excited to be part of the team! Jared and Jonathan [from Rebel] have been great and super easy to work with.
Justin Spitz
Wattson Health
The Rebel process was unmatched. It's founder friendly, quick, thoughtful and very straight forward. Would highly recommend Rebel to any of my founder friends.
Saif Abuhashish
Reform
The process was great. Rebel’s portfolio and team are super impressive.
Matt Aitken
Trigger.dev
It was a pleasure meeting Jonathan Hirsch and Michelle [from Rebel] last week - the experience was smooth and efficient. Founders outside of Bookface also had great things to share about their experience with Rebel - all great signs.
Aditya Sharma
Untether Labs
Dan [from Rebel] was one of my most memorable conversations. We love working with investors who are founders themselves, as they just 'get it’.
Katherine Wang
PartnerHQ
The Rebel investment process is amazing and actually inspired many of the future engagements we had with other funds. Looking forward to building the future together!
Ohad Navon
Octo
Regarding the process, it was one of the best experiences I’ve had so far. Transparent, efficient, founder friendly and value added from day one!
Luciana Reznik
Cedalio
08 — 325+ Companies
Portfolio
Rebel has made 325+ investments to date across a wide variety of technology verticals
342 companies
- AccessOwlYC S22
- Advanced Metal ResearchYC P26
- AegisYC X25
- Afford
- Agency Tool CompanyYC S26
- Agentic LabsYC W24
- AgentPhoneYC P26
- AirbyteYC W20
- AiSDRYC S23
- AIVideo.comYC S23
- AlbedoYC W21
- Aleph SolutionsYC S21
- Alga BiosciencesYC W22
- Algen BiotechnologiesYC W20
- AlmondYC X25
- ALT TEXYC S22
- AnaraYC S24
- AnchorYC S22
- AndcoYC P26
- Andromeda SurgicalYC S23
- AnfinYC W22
- Ångström AIYC S24
- ApolinkYC F24
- ArcaneYC W24
- ArchonYC W25
- AristYC S20
- Armilla AIYC W22
- Array LabsYC S22
- Asha HealthYC F24
- AtlaYC S23
- Autumn AIYC W26
- Avelis HealthYC S25
- Aviron InteractiveYC W21
- Avoca SystemsYC S26
- Axle HealthYC W21
- AxleYC S22
- BambooYC W20
- BelozFiYC W22
- BetterhalfYC W21
- Billow AI LabsYC S26
- Blank BioYC S25
- Boom AIYC F25
- BraviYC F25
- CactusYC X25
- Cair HealthYC S23
- Callab AIYC P26
- Capi MoneyYC S23
- Capitol AIYC S24
09 — Get in Touch
Contact Us
Rebel Fund only invests in Y Combinator-backed startups and does not respond to unsolicited investment offers. Founders can apply to Y Combinator here.