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Founder of JAM Fund | Co-founder of Tinder | Partnering with founders building generational companies

198 following4k followers

The Entrepreneur

Justin Mateen is a visionary entrepreneur and investor who thrives on identifying and partnering with generational founders to build transformative companies. He combines his deep startup experience with an eye for spotting early-stage innovators destined for explosive growth. His tweets radiate enthusiasm for disruptive ideas and celebrate the journey of building impactful businesses.

Impressions
354.9k67k
$66.52
Likes
1k179
61%
Retweets
5511
3%
Replies
939
5%
Bookmarks
54993
31%

Top users who interacted with Justin Mateen over the last 14 days

@kpooya

Entrepreneur. Obsessed with networks & linking everything (people+AI). Love new technologies & impactful innovation. šŸŒŽšŸ¤–ā¤ļø

2 interactions
@Johnny_Futbol17

Head of Partnership at @rise_pay | web3 | LFC | Christ is King

1 interactions
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@RealNilsJucaud

RealEstate VC GeoPolitics, here to cultivate my edge.

1 interactions
@fethikamisli

Founder - Esas Ventures | Formus Capital

1 interactions
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@VinoUncorked

Walker of faith | (2x acq.) Building something new šŸ“±šŸ¦šŸŒ

1 interactions
@victorcardenas

co-founder & ceo @slashapp | thiel fellow | prev cs @stanford | vzlano šŸ‡»šŸ‡Ŗ

1 interactions
1 interactions
@marlonsprints

I build whop apps

1 interactions
@StanleyWei4748

Founder of Pine AI, an autonomous agent that does tedious task that costs you hours; Angel investor and entrepreneur; Palo Alto; Philly; Tesla owner and SpaceX

1 interactions
@zebulgar

space drugs and arms @vardaspace | village idiot/partner @foundersfund

1 interactions
@thisisbethany_5

Growth Lead @NewsBreak/Growth Advisory for AI Startups; Ex-TikTok Growth; Ex-Morgan Stanley

1 interactions
1 interactions
@dwlz

building @starpath_ai and a few iOS apps. past: founder @ champify.io, @heap, @coffeembagel, @theblacktux, applied math @yale

1 interactions
@sir4K_zen

Automation specialist

1 interactions
@MillennialGuy

Every Sunday, I break down one topic in 5 practical tweets.

1 interactions
@cryptodaaddy

Growth Strategist • Web3 Investor | 9-Figure Vision • EX @ezu_xyz

1 interactions
@anto_lva

In pursuit of arbitraging truth | Operator & Investor. early at charles AI ($30M+ raised by @accel) and scout @vufund | Former pro athlete

1 interactions

Justin’s investing style is like a first date: super enthusiastic at first, maybe a bit impulsive, but occasionally ghosting the ā€˜one that got away’ before realizing they were a soulmate unicorn. Maybe next time, don’t swipe left so fast!

Raised early capital and invested in pre-launch companies like Deel and Kalshi that have since grown into decacorns worth tens of billions, solidifying his status as a top-tier startup investor and founder partner.

Justin's life purpose revolves around nurturing and scaling startups that have the potential to redefine industries and create lasting value, empowering founders to realize their boldest ambitions.

He believes in the power of visionary leadership, the importance of backing founders early, and that recognizing unique patterns and raw talent in startups can lead to generational success. He values determination, growth mindset, and the disruptive potential of technology-driven ventures.

His biggest strength lies in his fearless intuition in early-stage investments, combined with a knack for recognizing high-potential founders and companies before they hit mainstream success.

A tendency to hesitate or pass on certain opportunities too early, as seen in passing on Deel's Series A, which later ballooned into a massive success — the classic 'fumble' of an otherwise sharp investor.

To grow his audience on X, Justin should blend his insightful investment stories with more behind-the-scenes glimpses of startup life, leveraging short video clips and founder interviews. Engaging in topical conversations around emerging tech trends and sharing actionable advice for founders would deepen his thought leadership while fostering community engagement.

Fun fact: Justin once invested so eagerly in a startup during a phone call that he increased his stake three times while literally on the toilet abroad! Talk about multi-tasking your way to unicorns.

Top tweets of Justin Mateen

Sometimes lightning really can strike twice in one day. From the 175-company YC class in March 2019, I made just two personal investments, both on the same day- founded by visionary male/female co-founders: Kalshi and Deel. Six years later, Deel is a decacorn valued at $17.3 billion, and Kalshi would be a decacorn too if they raised today. @Kalshi (@mansourtarek_ & @luanalopeslara ) and @deel (@Bouazizalex & @shuoshuooshuooo ) were both pre-launch when I invested at $10 million post for Kalshi and $15 million post for Deel. The reasons you back a founder can sometimes be unusual, but when you recognize a familiar pattern, it’s best not to overthink it. šŸŽ„ Here’s @mansourtarek_ recounting why I wanted to take Kalshi’s entire seed note and why I decided to invest so quickly. The answer might surprise you: @mansourtarek_ @luanalopeslara @Kalshi

226k

Whop just crossed $2B in GTV and $142 mil in ARR. Gen Z doesn’t want traditional jobs. Whop is becoming the backbone for how they earn. I’m slightly biased… I invested in @WhopIO at a $3M valuation in 2021 and remain the largest shareholder outside the founders. Even from that seat, I still don’t fully understand how Gen Z makes a living. Most investors are asleep. They’ll notice when ARR goes from $142M toward $1B within 18 months. The CEO Steven is one of the most naturally talented leaders of his age group. A world class engineer with unusual range, speed, and instinct. He has the kind of raw, unstructured talent you can’t manufacture: randomly insane piano skills but no Ivy League polish. Whop is a hidden gem… a generational company built by generational founders.

28k

Story Time: Deel was an incredible investment - but also a massive fumble. Months after investing, I passed on the Series A at 4Ɨ my entry price. The math is ugly: Series A was at $60M post… and today Deel is worth $17.3B. The next year I met the founder of Rise. It wasn’t through my usual channels, I hesitated, and checked with @Bouazizalex to confirm it was ok. I invested in Rise at a $3M valuation. Basically a crypto focused Deel. In October Rise hit: • $11.5M ARR • 83% margins • 25% growth from Sep Started slow, but on this trajectory, they’re ~18 months from unicorn territory @hugfink congrats on hitting $1 billion in total payroll volume. Determination pays off. Huge space with room for multiple category leaders.

44k

Have backed @connorzwick and @adhsu founders of @speak since 2016- invested in 6 consecutive rounds starting at $10M. Pretty damn slow to become a unicorn, but now it’s on. šŸš€ • $100M ARR • 15M downloads • 40% daily retention • 120 team Fun story: on a 2018 call with Connor (while overseas and on the toilet) I upped my investment three times- kept realizing I needed to own more. They were talking AI and machine learning long before it was trendy.

27k

People often ask about my public positions. My three largest today (and likely for many more years) are AppLovin, Meta, and Tesla. (I’ll share the Tesla thesis separately.) Back in 2022, when I began building the AppLovin and Meta positions through stock and LEAPS, it wasn’t smooth. I started buying AppLovin around $30 and Meta after it broke $150- and for a while, I was getting crushed. At the bottom, I bought so aggressively that they became my largest holdings. They were misunderstood in that moment… but also obvious. It almost felt like the market was giving them away. Once you added back cash and stripped out Reality Labs losses for Meta, both were effectively trading at ~5.5Ɨ the EBITDA I expected over the next 12 months. What surprised me was how many hedge fund friends disagreed- very smart ones, too. For a moment it even made me question myself. Fast forward to today: AppLovin has delivered one of the most extraordinary runs I’ve ever seen… nearly a 70Ɨ move from the lows, backed by real earnings: • ~$236M enterprise value per employee (#1 globally) • ~$4.0–$4.8M profit per employee (#1 globally) Meta now trades at: • ~$23–$24M enterprise value per employee (#4 globally) • ~$1.0–$1.1M profit per employee (#3 globally) And with AI-driven efficiencies, Meta could operate with far fewer people, which would push it toward the #2 spot. These efficiency metrics matter, and I believe both companies will remain elite performers on them for many years. In public markets, the most misunderstood moments often create the most generational outcomes.

9k

My wife moved here from the U.K. years ago, and yesterday, the same day a self-described socialist became mayor of the financial capital of the world- she finally became an American. In that room of new citizens, you could feel pure hope… the belief that you can build something from nothing. That’s the American Dream. A promise of handouts may sound compassionate, but it quietly trades ambition for dependence, and that’s how great nations decline. Of course the majority will vote for someone promising things for free, but that illusion always ends up costing opportunity, ambition, and freedom. What moves society forward are the builders… those who take responsibility, take risks, and create opportunities that lift others. America became the world’s beacon because it rewarded that spirit- the courage to dream, to innovate, and to build a better life. We need to protect that mindset. Educate better. Think longer-term. Inspire the next generation to build, not depend. You can see that spirit in companies like @WhopIO (ironically based in NYC, but likely not for long) giving a new generation the platform and confidence to build their own future. Teach young people the power of equity, not just in markets, but in their own lives. Encourage saving, investing, and home ownership. Celebrate those who build slowly, brick by brick, creating generational stability. The American Dream isn’t dead, but it needs defending. And it’s worth defending. šŸ‡ŗšŸ‡øšŸ™

3k

Join me and @YahooNews live right now as we talk about how tech is reshaping the college experience: yhoo.it/15UPjCr #BornDigital

0

Sometimes lightning really can strike twice in one day. From the 175-company YC class in March 2019, I made just two personal investments, both founded by visionary male/female co-founders: Kalshi and Deel. Six years later, Deel is a decacorn valued at $17.3 billion, and Kalshi would be a decacorn too if they raised today. @Kalshi (@mansourtarek_ & @luanalopeslara ) and @deel (@Bouazizalex & @shuoshuooshuooo ) were both pre-launch when I invested at $10 million post for Kalshi and $15 million post for Deel. The reasons you back a founder can sometimes be unusual, but when you recognize a familiar pattern, it’s best not to overthink it. šŸŽ„ Here’s @mansourtarek_ recounting why I wanted to take Kalshi’s entire seed note and why I decided to invest so quickly. The answer might surprise you: @mansourtarek_ @luanalopeslara @Kalshi

428

Most engaged tweets of Justin Mateen

Sometimes lightning really can strike twice in one day. From the 175-company YC class in March 2019, I made just two personal investments, both on the same day- founded by visionary male/female co-founders: Kalshi and Deel. Six years later, Deel is a decacorn valued at $17.3 billion, and Kalshi would be a decacorn too if they raised today. @Kalshi (@mansourtarek_ & @luanalopeslara ) and @deel (@Bouazizalex & @shuoshuooshuooo ) were both pre-launch when I invested at $10 million post for Kalshi and $15 million post for Deel. The reasons you back a founder can sometimes be unusual, but when you recognize a familiar pattern, it’s best not to overthink it. šŸŽ„ Here’s @mansourtarek_ recounting why I wanted to take Kalshi’s entire seed note and why I decided to invest so quickly. The answer might surprise you: @mansourtarek_ @luanalopeslara @Kalshi

226k

Whop just crossed $2B in GTV and $142 mil in ARR. Gen Z doesn’t want traditional jobs. Whop is becoming the backbone for how they earn. I’m slightly biased… I invested in @WhopIO at a $3M valuation in 2021 and remain the largest shareholder outside the founders. Even from that seat, I still don’t fully understand how Gen Z makes a living. Most investors are asleep. They’ll notice when ARR goes from $142M toward $1B within 18 months. The CEO Steven is one of the most naturally talented leaders of his age group. A world class engineer with unusual range, speed, and instinct. He has the kind of raw, unstructured talent you can’t manufacture: randomly insane piano skills but no Ivy League polish. Whop is a hidden gem… a generational company built by generational founders.

28k

Have backed @connorzwick and @adhsu founders of @speak since 2016- invested in 6 consecutive rounds starting at $10M. Pretty damn slow to become a unicorn, but now it’s on. šŸš€ • $100M ARR • 15M downloads • 40% daily retention • 120 team Fun story: on a 2018 call with Connor (while overseas and on the toilet) I upped my investment three times- kept realizing I needed to own more. They were talking AI and machine learning long before it was trendy.

27k

People often ask about my public positions. My three largest today (and likely for many more years) are AppLovin, Meta, and Tesla. (I’ll share the Tesla thesis separately.) Back in 2022, when I began building the AppLovin and Meta positions through stock and LEAPS, it wasn’t smooth. I started buying AppLovin around $30 and Meta after it broke $150- and for a while, I was getting crushed. At the bottom, I bought so aggressively that they became my largest holdings. They were misunderstood in that moment… but also obvious. It almost felt like the market was giving them away. Once you added back cash and stripped out Reality Labs losses for Meta, both were effectively trading at ~5.5Ɨ the EBITDA I expected over the next 12 months. What surprised me was how many hedge fund friends disagreed- very smart ones, too. For a moment it even made me question myself. Fast forward to today: AppLovin has delivered one of the most extraordinary runs I’ve ever seen… nearly a 70Ɨ move from the lows, backed by real earnings: • ~$236M enterprise value per employee (#1 globally) • ~$4.0–$4.8M profit per employee (#1 globally) Meta now trades at: • ~$23–$24M enterprise value per employee (#4 globally) • ~$1.0–$1.1M profit per employee (#3 globally) And with AI-driven efficiencies, Meta could operate with far fewer people, which would push it toward the #2 spot. These efficiency metrics matter, and I believe both companies will remain elite performers on them for many years. In public markets, the most misunderstood moments often create the most generational outcomes.

9k

Story Time: Deel was an incredible investment - but also a massive fumble. Months after investing, I passed on the Series A at 4Ɨ my entry price. The math is ugly: Series A was at $60M post… and today Deel is worth $17.3B. The next year I met the founder of Rise. It wasn’t through my usual channels, I hesitated, and checked with @Bouazizalex to confirm it was ok. I invested in Rise at a $3M valuation. Basically a crypto focused Deel. In October Rise hit: • $11.5M ARR • 83% margins • 25% growth from Sep Started slow, but on this trajectory, they’re ~18 months from unicorn territory @hugfink congrats on hitting $1 billion in total payroll volume. Determination pays off. Huge space with room for multiple category leaders.

44k

Join me and @YahooNews live right now as we talk about how tech is reshaping the college experience: yhoo.it/15UPjCr #BornDigital

0

My wife moved here from the U.K. years ago, and yesterday, the same day a self-described socialist became mayor of the financial capital of the world- she finally became an American. In that room of new citizens, you could feel pure hope… the belief that you can build something from nothing. That’s the American Dream. A promise of handouts may sound compassionate, but it quietly trades ambition for dependence, and that’s how great nations decline. Of course the majority will vote for someone promising things for free, but that illusion always ends up costing opportunity, ambition, and freedom. What moves society forward are the builders… those who take responsibility, take risks, and create opportunities that lift others. America became the world’s beacon because it rewarded that spirit- the courage to dream, to innovate, and to build a better life. We need to protect that mindset. Educate better. Think longer-term. Inspire the next generation to build, not depend. You can see that spirit in companies like @WhopIO (ironically based in NYC, but likely not for long) giving a new generation the platform and confidence to build their own future. Teach young people the power of equity, not just in markets, but in their own lives. Encourage saving, investing, and home ownership. Celebrate those who build slowly, brick by brick, creating generational stability. The American Dream isn’t dead, but it needs defending. And it’s worth defending. šŸ‡ŗšŸ‡øšŸ™

3k

Sometimes lightning really can strike twice in one day. From the 175-company YC class in March 2019, I made just two personal investments, both founded by visionary male/female co-founders: Kalshi and Deel. Six years later, Deel is a decacorn valued at $17.3 billion, and Kalshi would be a decacorn too if they raised today. @Kalshi (@mansourtarek_ & @luanalopeslara ) and @deel (@Bouazizalex & @shuoshuooshuooo ) were both pre-launch when I invested at $10 million post for Kalshi and $15 million post for Deel. The reasons you back a founder can sometimes be unusual, but when you recognize a familiar pattern, it’s best not to overthink it. šŸŽ„ Here’s @mansourtarek_ recounting why I wanted to take Kalshi’s entire seed note and why I decided to invest so quickly. The answer might surprise you: @mansourtarek_ @luanalopeslara @Kalshi

428

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