mission
Rebel leverages data science and Silicon Valley’s most accomplished founders to invest in a diversified portfolio of top Y Combinator startups
Prioritizing People
Investors, Partners, & Founders
We build long-term relationships based upon our core values of trust, transparency, and mutual respect. We choose our LPs, partners, and portfolio companies selectively and then support each other for life.
Leveraging Technology
Making the Art of Venture Investing a Science
We use a proprietary machine-learning algorithm developed by an MIT data scientist to screen startups based on exit probability and expected ROI.
Insider Access
To Silicon Valley & Beyond
Rebel Fund is built from the ground up to leverage the expertise of top Y Combinator alumni to identify, access and support the world's most exciting technology startups.
Diversity Minded
Building a Diverse Portfolio of Talented Founders
The vast majority of founding teams Rebel Fund supports have a least one diversity factor, such as a female, black, latinx, or international co-founder.
REBEL PARTNERS
A team of top Y Combinator alumni who have co-founded companies now valued over $85B in aggregate and support Rebel’s due diligence, investment decisions, and portfolio support part-time while running their respective companies.
Steve Huffman
YC S05
Daniel Kan
Cruise
YC W14
Max Mullen
Instacart
YC S12
Trip Adler
Scribd
YC S06
Jonathan Hirsch
Paradigm
Non-YC biotech partner
Sebastian Mejia
Rappi
YC W16
REBEL LEADERSHIP
Our Managing Partner is a successful serial entrepreneur turned top-decile fund manager, bringing decades of technology startup operating and investing experience to support our portfolio founders. As a founder, he's built startups backed by the world's top venture capital funds and led companies to successful exits, and as an investor, built venture funds that have seeded technology startups now valued at over $10B in aggregate.
On the Y Combinator Summer 2023 batch
As my long-time readers know, Rebel Fund builds and maintains the most comprehensive database that exists of Y Combinator startups and founders (perhaps outside of YC itself) with hundreds of thousands of new data points.... read more
On the 176% annual return of a YC startup index
As my long-time readers know, I’ve written dozens of data-driven blog posts on Y Combinator startups over the years, but I’m yet to answer the single most important question about YC startups from the perspective.... read more
On the Y Combinator Winter '23 batch (written with GPT-4)
Rebel Fund is one of the largest and most prolific investors in Y Combinator startups and builds the most comprehensive database that exists of new YC startups each year to feed our proprietary Rebel Theorem 2.0 machine learning... read more
On Y Combinator startups and the AI revolution
ChatGPT launched on November 30, 2022, and gained over one million users within five days. Now a couple of months later, it’s fully mainstream with over 100 million users — this is faster mass adoption of... read more
On the shifting landscape of YC batches (2023 update)
A few years ago, I wrote a post On the shifting landscape of YC batches to analyze statistical trends in Y Combinator startups by industry over time. Since Rebel Fund has since collected hundreds of thousands of... read more
On the life and death of Y Combinator startups
I’ve written much over the years about the incredible success of Y Combinator startups, but as any experienced startup founder or investor knows, there is a dark side to technology innovation… lots of startups just don't... read more
On YC startup exits
As a venture capital fund manager, one of the questions I’m asked most often by LPs is “How long will it take to get my money back?” At Rebel Fund, our job is to invest in the top 5–10% of new Y Combinator... read more
On 101 Y Combinator unicorns
In August 2022, Y Combinator released its latest Top Companies list, now including 314 private and 16 public YC startups each valued at over $150M. YC officially reported ‘over 80’ of these startups to be valued at... read more
On Rebel Theorem 2.0
A couple of years ago I published On Rebel Theorem to reveal the proprietary machine-learning algorithm we use at Rebel Fund to maximize our odds of success investing in tomorrow’s top Y Combinator startups... read more
On the Y Combinator “premium” (2022 update)
One of the most common complaints I hear amongst Y Combinator startup investors is their sky-high valuations. It’s not uncommon for YC startups to raise capital at 2-3 times the valuation of their non-YC peers at... read more
On the Y Combinator Summer 2022 batch
Last year I published an in-depth analysis of the Y Combinator Summer 2021 batch that was later shared by YC itself! I’ll repeat the tradition this year for the Summer 2022 (S22) batch, since we’re in an excellent position to... read more
On the rapid internationalization of Y Combinator startups
In my last post On Y Combinator batch quality at scale we looked at the dramatic increase in the number of YC startups over the years and how batch quality has held up. Anyone who has been to YC Demo Days in... read more
Webinars
Early-Stage Venture Investing in a Time of Crisis
Hosted by Rebel Fund
You'll learn how some of Silicon Valley’s top early-stage VC’s view the COVID-19 crisis, its economic fallout, and the future of venture in unprecedented times. How are they adjusting their portfolio strategy and investment pacing? What are their expectations around startup valuations? How does this economic crisis compare to previous ones? What do they view as the greatest risks and opportunities? How do they expect this to ultimately impact LP investment returns?Click the image to register or watch the recording
COVID-19: How Disruption Creates Opportunity
Hosted by Rebel Fund
In this webinar you will learn from some of the brightest minds in Venture Capital how global VC’s are turning COVID-19 disruption into investment opportunities. What unique market opportunities has COVID-19 created that didn't exist a few months ago? What types of problems are today's fastest-growing startups tackling? Who are some of the most innovative startups solving this worldwide crisis? Which behavioral changes caused by COVID-19 will “stick” long enough to build a company around? Click the image to register or watch the recording
portfolio
Rebel has made 100+ investments to date across a wide variety of technology verticals
AccessOwl (S22)
Okta for Startups
Airbyte (W20)
Unlocking ad-blocked traffic across all your tools
Albedo (W21)
Albedo captures the highest resolution satellite imagery
Aleph Solutions (S21)
Allows brands to fully address the main challenges related to e-commerce
Alga Biosciences (W22)
A proprietary feed additive that stops methane emissions from cattle
Algen Biotechnologies (W20)
Using CRISPR to find treatments for cancer
Alt Tex (S22)
ALT TEX creates biodegradable and carbon neutral textiles engineered from food waste
Amiloz (W22)
Tech enabled inventory supplier for corner stores in LatAm
Anchor (S22)
Banking-as-a-service & embedded finance platform for Africa.
Andromeda Surgical (S23)
We're building the "Nintendo of surgery"
Anfin (W22)
Stock trading and wealth management for Vietnam
Apollo Group (W23)
Managed marketplace for back-office services
Arist (S20)
Workforce training via text message
Armilla AI (W22)
Quality Assurance platform for Machine Learning Systems
Array Labs (S22)
Building satellites to create the first real-time high-resolution map of the world
Atla (S23)
Building helpful and honest AI assistant for legal teams
Aviron Interactive (W21)
Aviron is high-intensity Peloton for rowing
Axle (S22)
Axle is “Plaid for Insurance”, focused on auto insurance to start
Axle Health (W21)
Enables any healthcare organization to send health professionals in-home
Bamboo (W20)
We're building Fidelity for Africa
Bend (S22)
Track companies as they cut carbon, and measure your supply chain footprint
Betterhalf (W21)
India's first and only Marriage Super App for 100M people
Capi Money (S23)
Helping businesses in Africa pay their international suppliers
Cedalio (S23)
The easiest way to store auditable and traceable data
Cercli (S23)
Automating payroll, HR, compliance, onboarding & more for MENA
Cerrion (S22)
Helps manufacturers automatically detect problems on their production lines using Computer Vision
Clinikally (S22)
India's one-stop Telemedicine Platform & Online Pharmacy for Dermatology
Craniometrix (W22)
Diagnosing Alzheimer’s 3x more accurately than a doctor - all from your cellphone
Creizer (W22)
We provide revenue-based financing to online sellers
Crew (S21)
Modern all-in-one recruiting CRM that helps you hire the A players
CypherD Wallet (W22)
We are building crypto wallet for the next billion users without the necessity to be a crypto geek
Daybreak Health (S20)
Online counseling designed for teens
Docsum (S23)
AI contract reviewer for sales teams
Drapr (S20)
We let shoppers try on clothing online
Drip (S22)
Drip is Klarna for Brazil, built on Pix
Dr. Treat (S22)
Tech-enabled modern veterinary designed to give your pet highly personalized care
Earth AI (S19)
EARTH AI is the world’s most efficient mineral explorer
Embrace (S19)
Mobile teams find, recreate and fix every error easily
Empirical Health (S23)
Adapt automated sales emails with AI to build B2B sales intelligence
Enable.us (W21)
B2B Hub for Virtual Selling
Evoly (S22)
Makes smart electric and water meters as a service
Fastgen (W23)
Webflow for the Backend
Fiber AI (S23)
Reimagined, AI-powered Marketo for startups
Finblox (W22)
A crypto neobank for the emerging markets
Flat.mx (S20)
We're the Opendoor of Mexico
Fleek (W22)
B2B wholesale marketplace for second-hand fashion
Flightcontrol (W22)
We make it easy for developers to deploy scalable, secure applications without any devops
Flowly (S21)
The VR version of Calm with a focus on reducing chronic pain for 100 million Americans
Fly.io (W20)
Fly.io runs app servers close to users
Fynn (W20)
ISAs for Trade Schools
Greywing (W21)
Greywing automates crew changes and vessel operations
Gridware (W21)
Makes hardware devices that help utilities identify when and where power lines will cause wildfires
GroMo (W21)
GroMo is an app for agents to sell insurance in India
Gullak Money (S22)
Gullak is a mobile app that automates savings & invests these in Gold
Honeydew (W23)
The home for shared data logic
HoyTrabajas (W22)
Supporting companies to recruit their slow-skilled talents at scale in no time
Hyperbound (S23)
Adapt automated sales emails with AI to build B2B sales intelligence
Impossible Mining (W22)
Building underwater robotics vehicles which collect battery metals without harming the environment
InEvent (S19)
Advanced event software for enterprises
Infinia (W23)
Helping merchants accept bank payments in LATAM
Intently (W23)
Helping sales teams automatically identify the best targets using AI
Invofox (S22)
Automatic data extraction from invoices
Invopop (W23)
We help global software companies comply with local tax reporting
Jeeves (S20)
International infrastructure built from scratch, starting with corporate cards for startups in Mexico, Canada and UK
Jestor (S21)
No-code tool for operations teams
Juno (S19)
A coding school for underemployed university graduates
JustPaid (W23)
AI-powered financial controller automating bill pay and invoicing
A bank account and credit card for Canadian SMBs
Khabri (S19)
Audio platform for education serving non-english users
Krave Mart (S22)
Grocery and everyday essentials app in Pakistan
Koywe (W23)
Crypto On and Off Ramp for Latam
Laskie (W21)
Enterprise platform for professional services
Lofty AI (S19)
We help people buy homes with Zero risk
MadEats (S21)
Building high quality internet food brands engineered for delivery
MarketForce 360 (S20)
We are 'Salesforce' for retail distribution in Africa
Mercator (S22)
Mapping tools for vehicle fleets
Milio (W23)
B2B payments infrastructure for emerging markets
Momentu (S22)
Corporate mental health platform for Latin America
Mudafy (S19)
Compass for Latin America
My NextDerma (W21)
Largest dermatology virtual clinic in LATAM
Narrative (W23)
Bill.com for logistics
Novig (S22)
The first commission-free, high-frequency sports betting exchange
Omnistrate (W23)
Transform any software to multi-cloud SaaS in minutes not years
Outloud.ai (S21)
Building Gong.io for offline retail
Outset (S23)
AI-powered user research
Pair AI (W23)
Reimagining education with short form video and AI
Payflow (S21)
A mobile app that allows employees to get paid their salary on-demand
Peakflo (W22)
We streamline receivables and payables for growing SMBs in SE Asia
Peeba (W23)
Faire for Asia
Philippo (W22)
We provide homeowners in Latam access to their home equity.
Pillar (S21)
Health coaching as a service
Proglix (W23)
B2B Marketplace for Raw Materials in Indonesia
Promoted.ai (W21)
Performance ads & discovery for marketplaces
Queenly (W21)
Best way to help women find the exact dress they are looking for
Recall.ai (W20)
Recall is Plaid for voice and video intelligence.
Redcliffe Lifetech (W21)
DNA Diagnostics and Deep insights, IVF clinics, Research
Reworkd AI (S23)
The Open Source Zapier of AI Agents
Rider (W22)
Rider is modern parcel delivery for Pakistan.
Room Service (S19)
Provides a React State Management Library and infrastructure for building real-time collaboration
SalaryBook (S21)
We are Gusto for India
SaveIN (W22)
SaveIN is Buy now, Pay later for healthcare in India
Scanbase (W23)
The API for Diagnostic Test Analysis
Seabound (W22)
We capture CO2 emissions from ships
Sekilo (W22)
We are a daily needs platform that guarantees 15 minutes deliveries using a network of dark stores
Serif Health (W22)
Pricing intelligence for healthcare providers
Shape Labs (S15)
Helps you know your body and guides you to live a healthier and more beautiful life
Shekel Mobility (W23)
B2B marketplace for Auto Dealers in Africa
Sitenna (S21)
We connect the market by mapping assets and using workflows to speed up the process
Slauth.io (S22)
Access management platform to secure the cloud
Spine AI (S23)
Simplify the building of AI copilots for enterprise products
SPRX Technologies (W23)
AI for corporate R&D tax credits
Stackshine (W22)
Stackshine automates software management operations for IT teams
Starling (W22)
Remote patient monitoring of urine
Storyboarder (W23)
Tool and platform to create and sell webcomics
Strong Compute (W22)
1000x faster cloud compute
Synapticure (S20)
Full-stack telehealth for neurodegenerative disease
Syncly (W23)
AI to automatically analyze all your customer emails
Theya (W23)
The world's simplest Bitcoin self-custody solution
Together (S19)
Enterprise SaaS to run an internal employee mentoring programs
Trackingplan (W22)
Datadog for analytics and marketing teams
Tranch (S22)
We’re a buy now pay later solution for SaaS and Services
Trigger.dev (W23)
The developer-first open source Zapier alternative
Truemetrics (S23)
Fixing bad GPS positions and incomplete map data on the last mile
Trusty (W22)
Private MLS for exclusive off-market real estate
Turing (W20)
Replace consumer brand's formulation testing loop development with our software
Typewise (S22)
Text prediction to boost productivity in customer service and sales
Underground Cellar (W15)
Leading wine e-commerce company that is changing the way wine is bought and sold
Unified National (W22)
Sells homes directly to buyers -- they can tour any time and buy online with peace of mind
Unravel Carbon (W22)
We are an enterprise software that helps companies track and reduce their carbon emissions, focusing in Asia
Untether Labs (W23)
Scheduling software for digital health clinics to serve more
Vaero (W23)
Fivetran for log data
Vahan (S19)
Building a full-stack labor marketplace for the gig-economy in India
Vellum (W23)
Developer platform for building great AI applications
Verifiable (S20)
API to verify and monitor healthcare licenses
Vitalize Care (W23)
Improving the mental health of healthcare professionals
Wallbit Pay (W23)
Neobank for global remote workers
WareIQ (S20)
Amazon-prime like logistics for online brands in India
Wattson Health (S23)
Pharmacy automation platform that increases RX throughput & accuracy
Writesonic (S21)
AI-powered copywriting and content marketing
Wyvern (W22)
High-res images from space to measure natural resources and crop health.
Yassir (W20)
Leading Super App for French Speaking Africa
Yuma (W23)
ChatGPT for customer support
Z1 (W21)
Digital bank for teenagers in LatAm
Zuma (S21)
Sales engagement platform that helps businesses create the fastest conversion experience for any internet lead
Zywa (W22)
Neobank for teenagers in the Middle East and North Africa
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.
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