Content
Justin Mateen
I look for ambitious founders who want to change the world and back them throughout their company building journey.
Some big wins…
| Company | Entry Value | Latest Value | Rounds Invested | |
|---|---|---|---|---|
 | $10M | $40B | Pre-seed · Seed · Series A · Series B | |
 | $15M | $17.3B | Seed | |
 | $3M | $1.6B | Pre-seed · Seed · Series A | |
 | $3M | $1.28B | Pre-seed · Seed · Series B | |
 | $7M | $1.4B | Pre-seed · Seed · Series A | |
 | $15M | $7.87B | Pre-seed · Seed | |
 Stoke Space | $20M | $10B | Pre-seed · Seed | |
 Home Chef | $3M | $700M (acquired) | Pre-seed · Seed 1 · Seed 2 · Series A · Series A extension · Series B | |
 HUT 8 | $117M | ~$12B (Public) | Series A · Series B · Public | |
 | $10M | $1B | Pre-seed · Seed 1 · Seed 2 · Seed 3 · Series A · Series B | |
 | $8M | $750M | Seed | |
 | $20M | $1.8B+ | Pre-seed · Seed | |
 | $21B | $2.01T | Series H | |
 | $20M | $1.64B | Seed · Series A · Series B | |
 | $30M | $2.3B | Seed | |
| SubQuadratic | $10M | $500M | Pre-seed · Seed 1 · Seed 2 | |
 | $920M | $23B | Series B | |
 | $30M | $650M | Seed | |
 | $10M | $1–1.5B (acquired) | Pre-seed · Seed · Series A · Series B · Series F | |
 Tinder | Co-founder | $42B peak | ||
| Entry value is the valuation when I first invested. Latest value is the most recent known valuation — from a priced round, acquisition, or the public market. | ||||
…and many more.
If you’re an ambitious founder building something cool, find me on X.
Companies
Kalshi
Kalshi operates a federally regulated exchange where people trade event contracts tied to elections, economic data, sports, and other real-world outcomes.
Tarek Mansour
Luana Lopes LaraRounds invested
Pre-seed, Seed, Series A, Series B
Reported valuation target · Jun 2026
$40B
Press
CoinDesk: Kalshi seeks funding at $40 billion valuation TechCrunch: Justin Mateen named among Kalshi's early investors
Visit Kalshi siteDeel
Deel gives companies one platform to hire, pay, manage, and equip employees and contractors across countries. It combines global payroll, HR, compliance, mobility, and IT services.
Alex Bouaziz
Shuo WangLatest valuation · Oct 2025
$17.3B
Press
TechCrunch: Deel hits $17.3B valuation after $300M raise The Peel: Justin Mateen named among Deel's investors
Visit Deel siteWhop
A marketplace where creators sell digital products, courses, software, and online communities.
Steven Schwartz
Cameron Zoub
Jack SharkeyRounds invested
Pre-seed, Seed, Series A
Latest valuation · Feb 2026
$1.6B
Press
CoinDesk: Tether invests $200M in Whop, valuing it at $1.6B FinSMEs: Justin Mateen doubles down in Whop's Series A
Visit Whop siteCurative Health
Curative provides employer-sponsored health plans with $0 copays and deductibles for members who complete an annual Baseline Visit. The company shifted from COVID-19 testing to health insurance in 2022 and 2023.
Fred TurnerRounds invested
Pre-seed, Seed, Series B
Latest valuation · Dec 2025
$1.28B
Press
Beinsure: Justin Mateen doubles down on Curative Fierce Healthcare: Curative banks $150M Series B at ~$1.3B valuation
Visit Curative Health siteSlash
Slash provides AI-powered business banking for online businesses, including accounts, corporate cards, payments, and expense management.
Victor Cardenas
Kevin BaiRounds invested
Pre-seed, Seed, Series A
Latest valuation · Apr 2026
$1.4B
Press
TechCrunch: Slash raises $100M at $1.4B valuation TFN: Justin Mateen backs Slash's early funding
Visit Slash siteHadrian
Hadrian builds and operates automated factories that manufacture parts, assemblies, and complete products for aerospace and defense customers. Its factories use robotics, software, and advanced machining.
Chris PowerRounds invested
Pre-seed, Seed
Latest valuation · Aug 2026
$7.87B
Press
TechCrunch: Hadrian raises $1.37B at $8B valuation Bloomberg: Hadrian valued at $7.87 billion in new round
Visit Hadrian siteStoke Space
Stoke Space is developing Nova, a family of fully and rapidly reusable launch vehicles. Its first orbital configuration, Nova Pathfinder, is designed to reach orbit and return both stages for reuse.
Andy Lapsa
Tom FeldmanRounds invested
Pre-seed, Seed
Latest valuation · Sep 2026
$10B
Press
Reuters: Stoke Space raises $1B at $10B valuation TechCrunch: Stoke Space raises another billion to rival SpaceX
Visit Stoke Space siteSpaceX
SpaceX designs, manufactures, and launches reusable rockets and spacecraft. It also operates Starlink, a satellite network that provides broadband internet service.
Elon MuskCurrent valuation · 2026
$2.01T
Press
Reuters: SpaceX eyes $1.75T valuation in record IPO Reuters: SpaceX plans $135/share IPO price, $75B raise
Visit SpaceX siteVarda
Varda designs and flies spacecraft that process pharmaceuticals in microgravity and return them to Earth in reentry capsules. Its spacecraft also serve as hypersonic reentry test platforms.
Will Bruey
Delian AsparouhovRounds invested
Seed, Series A, Series B
Series D valuation · Feb 2026
$1.64B
Press
PM Insights: Varda's $1.64B Series D valuation TechCrunch: Justin Mateen participates in Varda's seed round
Visit Varda siteLong Wall
Long Wall, formerly ABL Space Systems, develops missile-defense interceptors and test boosters for government customers. It rebranded in February 2025 after shifting away from commercial rocket launches.
Harry O'Hanley
Dan PiemontRounds invested
Seed (ABL), Series A (ABL), Series B (ABL), Series C (ABL), Seed (Long Wall), Series A (Long Wall)
Press
Aviation Week: Long Wall unveils surface-launched missile after rebrand LA TechWatch: Justin Mateen and JAM Fund named among ABL's investors
Visit Long Wall siteTinder
Tinder is the world's most popular location-based social discovery and dating application. Launched in 2012, it pioneered the swipe and grew into a global phenomenon used by millions of people around the world.
Justin Mateen
Sean Rad
Jonathan BadeenPress
Peak valuation: $42B — August 2021 Match settles lawsuit with Tinder co-founders for $441 million
Visit Tinder siteHUT 8
Hut 8 develops and operates power, digital infrastructure, and compute assets for energy-intensive uses. Its bitcoin-mining business moved into American Bitcoin, with Hut 8 serving as its infrastructure and operations partner.
Asher Genoot
Mike HoRounds invested
Series A, Series B, Public
Enterprise value · Sep 9, 2026
~$12B
Press
PR Newswire: Approximately $26.6B of expected base-term contract value across 949 MW of contracted AI data center capacity YCharts: ~$12B enterprise value (Sept. 9, 2026)
Visit HUT 8 siteBrex
Brex is an AI-native finance platform combining corporate cards, spend management software, and banking in one place. Capital One acquired the company in 2026.
Rounds invested
Series B, Series C
Reported acquisition value · 2026
$5.15B
Press
Business Wire: Capital One to acquire Brex for $5.15B
Visit Brex siteSpeak
Speak is an AI language-learning app where users practice conversation with an AI tutor and receive feedback on pronunciation, grammar, and vocabulary.
Connor ZwickCEO
Andrew HsuCo-founderRounds invested
Pre-seed, Seed 1, Seed 2, Seed 3, Series A, Series B
Latest valuation · Dec 2024
$1B
Press
TechCrunch: Speak raises $78M at $1B valuation TechCrunch: Justin Mateen participates in Speak's Series B
Visit Speak siteRadiant Nuclear
Radiant Nuclear is developing Kaleidos, a factory-built 1-megawatt microreactor that can be transported to customer sites. It is designed to supply primary or backup power without on-site spent-fuel storage.
Doug BernauerRounds invested
Pre-seed, Seed
Latest valuation · Dec 2025
$1.8B+
Press
TechCrunch: Radiant Nuclear raises $300M at $1.8B+ valuation Reuters: Radiant raises over $300M to build nuclear microreactors
Visit Radiant Nuclear siteOwner.com
Owner.com provides independent restaurants with websites, online ordering, branded apps, delivery, automated marketing, and loyalty tools.
Adam Guild
Dean BloembergenLatest valuation · Aug 2026
$2.3B
Press
WSJ/Dow Jones: Owner raises $240M at $2.3B valuation Bloomberg: Owner.com hits $1B valuation
Visit Owner.com siteHome Chef
Home Chef sells meal kits and ready-made meals online and through grocery stores. It has operated as a Kroger subsidiary since 2018.
Pat VihtelicRounds invested
Pre-seed, Seed 1, Seed 2, Series A, Series A extension, Series B
Acquisition value · May 2018
~$700M
Press
Supermarket News: Kroger acquires Home Chef for ~$700M
Visit Home Chef siteThe Boring Company
The Boring Company develops tunneling technology and operates Loop transportation systems in underground tunnels, including the Las Vegas Convention Center Loop.
Elon MuskReported funding valuation · Jul 2026
$23B
Press
TechCrunch: Boring Company raises $675M at $5.7B valuation TechCrunch: Boring Company reportedly raising at $20B valuation
Visit The Boring Company siteBlank Street
Blank Street operates more than 100 coffee shops across the United States and United Kingdom, serving coffee, matcha, tea, and baked goods.
Vinay MendaCo-founder
Issam FreihaCo-founderReported valuation · 2026
$650M
Press
Pulse2: Blank Street raises $75M led by General Atlantic at $650M valuation Daily Coffee News: Blank Street raises $105M, expands to LA
Visit Blank Street siteRegent
REGENT develops and manufactures all-electric seagliders, high-speed maritime vessels that operate over water for coastal passenger, cargo, logistics, and emergency-response routes.
Billy Thalheimer
Mike KlinkerPress
Providence Journal: REGENT's seaglider takes flight in Narragansett Bay Aviation Week: Regent raises $240M to advance seaglider manufacturing
Visit Regent siteAlto Pharmacy
Alto Pharmacy fills and manages prescriptions and delivers medication to patients. Paulus Holdings acquired the company in May 2025, and Alto continues to operate.
Matt Gamache-Asselin
Jamie KarrakerRounds invested
Pre-seed, Seed, Series A, Series B, Series F
Reported acquisition value · May 2025
$1–1.5B
Press
Bloomberg: Paulus to acquire SoftBank-backed Alto Pharmacy at $1–1.5B
Visit Alto Pharmacy siteVerse Medical
Verse Medical provides software for in-home healthcare and medical equipment supply, including ordering, insurance verification, and logistics. Formerly JetLenses, the company shifted from contact lenses to home healthcare around 2020 and 2021.
Dhaivat PandyaLast-round post-money valuation · Sep 2026
$750M
Press
TechCrunch: JetLenses (now Verse Medical) aims to save you money on contacts
Visit Verse Medical siteLast Energy
Last Energy develops, finances, builds, owns, and operates modular 20-megawatt nuclear power plants for industrial customers.
Bret KugelmassRounds invested
Series A, Series B, Series C
Press
TechCrunch: Last Energy raises $100M for its micro reactor
Visit Last Energy siteEmerald Cloud Lab
Emerald Cloud Lab operates robotic laboratories that scientists control through software to run biology and chemistry experiments remotely.
Brian Frezza
DJ KleinbaumPress
TechCrunch: Emerald Cloud Laboratory — experimenting with drugs in the cloud Bio-IT World: Emerald Cloud Labs' hardware and software vision
Visit Emerald Cloud Lab siteSubcritical
Subcritical Systems Inc. is developing the Energy Amplifier, a nuclear power system that uses a particle accelerator to drive a subcritical fission core, so the reaction stops as soon as the accelerator beam is switched off.
Fred TurnerCo-founder · CEO
Dr. Dina TurnerCo-founder · PresidentPress
NRC: Response on the Energy Amplifier licensing strategy
Visit Subcritical siteSubQuadratic
Frontier AI lab building long-context large language models.
Alexander Whedon
Justin DangelRounds invested
Pre-seed, Seed 1, Seed 2
Reported valuation
$500M
Press
SiliconANGLE: Subquadratic launches with $29M
Visit SubQuadratic siteKovi
Kovi operates a car-subscription service for ride-hailing drivers in Brazil. Moove acquired the company in January 2025, and Kovi continues to operate under its own brand.
Adhemar Milani NetoRounds invested
Seed, Series A, Series B, Post-Series B note
Press
TechCrunch: Moove acquires Brazil's Kovi Global Venturing: Justin Mateen joined Kovi's seed, Series A, and Series B rounds
Visit Kovi siteGenius
Genius is the world’s biggest collection of song lyrics and musical knowledge, with crowdsourced annotations explaining the stories behind the songs. Acquired in a private equity acquisition; Justin is the company’s largest shareholder.
Visit Genius siteRecognition
Press