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Discovering Tomorrow's PayPal Mafia Today

Highlighting founders emerging from top startups

Read by investors managing $100B+ AUM. Limited to 200 members.

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3.30.26 - The Physical Intelligence & Mistral Mafia
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Early Team

3.30.26 - The Physical Intelligence & Mistral Mafia

Founding MTS @ Physical Intelligence, Mistral Founding Member, Anduril early SF engineer, Mistral researchers from DeepMind, OpenAI, and Meta FAIR (Llama), and a founding team member from Bessemer-backed Sett
3.23.26 - The Kalshi Mafia
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Kalshi

3.23.26 - The Kalshi Mafia

Kalshi’s 1st FTE, founding engineers behind the core trading product, former Chief of Staff, and a YC-backed repeat founder.
3.9.26 - The Anduril Mafia
Members Only
Founders Fund

3.9.26 - The Anduril Mafia

Anduril Chief Engineer, Mach Industries CTO, Founding MTS at Physical Intelligence, and other Anduril engineering leaders from SpaceX, CIA, and Uber ATG
3.31.26 - The Saronic & Whoop Mafia
Members Only
Kleiner Perkins

3.31.26 - The Saronic & Whoop Mafia

WHOOP’s CTO (ex–Waymo Chief Engineer, Apple Autonomy, $130M co-founder), Saronic engineers launching a16z- and Boost-backed startups, a YC F25 repeat founder, and Whirl AI’s founding engineer
3.30.26 - The Physical Intelligence & Mistral Mafia
Members Only
Early Team

3.30.26 - The Physical Intelligence & Mistral Mafia

Founding MTS @ Physical Intelligence, Mistral Founding Member, Anduril early SF engineer, Mistral researchers from DeepMind, OpenAI, and Meta FAIR (Llama), and a founding team member from Bessemer-backed Sett
3.27.26 - Top Founders of the Week
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Top Founders of the Week

3.27.26 - Top Founders of the Week

Kalshi’s 1st FTE, Anduril’s Chief Engineer, Shield AI's COO, Dreamer's CTO, and an Early Palantir Member.
3.26.26 - The Shield AI Mafia
Members Only
A16Z

3.26.26 - The Shield AI Mafia

Shield AI’s COO turned founder, Anduril’s former Chief Engineer, Tesla Cybertruck lead and Mach Industries build head, Founders Fund/Index-backed founding ML engineer, and a $100M Felicis-backed founder transitioning out of CEO
3.25.26 - Founding Members from Verily, Cape, Halter and a Repeat 8-Figure Founder
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Verily

3.25.26 - Founding Members from Verily, Cape, Halter and a Repeat 8-Figure Founder

Verily's founding GM, a16z Bio Fund partner, $70M founder with Tempus exit, Lilac AI's 1st engineer (acquired by Databricks), Cape's founding SWE & 11-year Palantir tech lead, and the early Halter team
3.24.26 - A16Z-backed Founder, Post-Acquisition Founders from Amazon and Meta Deals, Plus Shepherd's Day-One Engineers
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A16Z

3.24.26 - A16Z-backed Founder, Post-Acquisition Founders from Amazon and Meta Deals, Plus Shepherd's Day-One Engineers

Fauna Robotics co-founder (NYU prof, ex-OpenAI) building in robotics again, Dreamer CTO and 3rd FTE now free agents, Shepherd's 1st FTEs, and repeat founders across Aviato, Riveter, and Daedalus
3.23.26 - The Kalshi Mafia
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Kalshi

3.23.26 - The Kalshi Mafia

Kalshi’s 1st FTE, founding engineers behind the core trading product, former Chief of Staff, and a YC-backed repeat founder.
3.20.26 - Top Founders of the Week
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Top Founders of the Week

3.20.26 - Top Founders of the Week

Repeat founder (prior exit), founding engineers behind Rox ($1.2B) and Sunday ($165M), plus YC and Z Fellows-backed founders
3.19.26 - Repeat Founder, ex GC-backed Founding Team, and an IOI Gold Medalist
Members Only
General Catalyst

3.19.26 - Repeat Founder, ex GC-backed Founding Team, and an IOI Gold Medalist

Posh's Co-Founder, Founding Members of Autoscience, MIT student with IOI gold medals, and key Arc operators
3.18.26 - Founding Operators from Paraform & Hanover Park
Members Only
Scale

3.18.26 - Founding Operators from Paraform & Hanover Park

Paraform & Hanover Park founding operators, and early builders across Axiamatic, Grow Therapy, and Andromeda
3.17.26 - 3 Repeat Founders and Lightspeed & GV-backed Founding Engineers
Members Only
Bessemer

3.17.26 - 3 Repeat Founders and Lightspeed & GV-backed Founding Engineers

Atlassian-acquired founder on his 4th act, co-founders of Tamarind Bio & DiligenceSquared, Quince’s CRO, and founding engineers from Gushwork & Translucent
3.16.26 - Unicorn Founder, Benchmark & GC-Backed Founding Engineers, and Early Uber Operator
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Sunday

3.16.26 - Unicorn Founder, Benchmark & GC-Backed Founding Engineers, and Early Uber Operator

Founding engineers from Sunday & Rox, Uber’s 50th FTE and Jump COO, and Factorial’s co-founder

Repeat Founder

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3.31.26 - The Saronic & Whoop Mafia
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Kleiner Perkins

3.31.26 - The Saronic & Whoop Mafia

WHOOP’s CTO (ex–Waymo Chief Engineer, Apple Autonomy, $130M co-founder), Saronic engineers launching a16z- and Boost-backed startups, a YC F25 repeat founder, and Whirl AI’s founding engineer
3.27.26 - Top Founders of the Week
Members Only
Top Founders of the Week

3.27.26 - Top Founders of the Week

Kalshi’s 1st FTE, Anduril’s Chief Engineer, Shield AI's COO, Dreamer's CTO, and an Early Palantir Member.
3.26.26 - The Shield AI Mafia
Members Only
A16Z

3.26.26 - The Shield AI Mafia

Shield AI’s COO turned founder, Anduril’s former Chief Engineer, Tesla Cybertruck lead and Mach Industries build head, Founders Fund/Index-backed founding ML engineer, and a $100M Felicis-backed founder transitioning out of CEO

Founding Engineer

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3.31.26 - The Saronic & Whoop Mafia
Members Only
Kleiner Perkins

3.31.26 - The Saronic & Whoop Mafia

WHOOP’s CTO (ex–Waymo Chief Engineer, Apple Autonomy, $130M co-founder), Saronic engineers launching a16z- and Boost-backed startups, a YC F25 repeat founder, and Whirl AI’s founding engineer
3.30.26 - The Physical Intelligence & Mistral Mafia
Members Only
Early Team

3.30.26 - The Physical Intelligence & Mistral Mafia

Founding MTS @ Physical Intelligence, Mistral Founding Member, Anduril early SF engineer, Mistral researchers from DeepMind, OpenAI, and Meta FAIR (Llama), and a founding team member from Bessemer-backed Sett
3.27.26 - Top Founders of the Week
Members Only
Top Founders of the Week

3.27.26 - Top Founders of the Week

Kalshi’s 1st FTE, Anduril’s Chief Engineer, Shield AI's COO, Dreamer's CTO, and an Early Palantir Member.

Repeat Founding Engineer

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3.27.26 - Top Founders of the Week
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Top Founders of the Week

3.27.26 - Top Founders of the Week

Kalshi’s 1st FTE, Anduril’s Chief Engineer, Shield AI's COO, Dreamer's CTO, and an Early Palantir Member.
3.23.26 - The Kalshi Mafia
Members Only
Kalshi

3.23.26 - The Kalshi Mafia

Kalshi’s 1st FTE, founding engineers behind the core trading product, former Chief of Staff, and a YC-backed repeat founder.
3.16.26 - Unicorn Founder, Benchmark & GC-Backed Founding Engineers, and Early Uber Operator
Members Only
Sunday

3.16.26 - Unicorn Founder, Benchmark & GC-Backed Founding Engineers, and Early Uber Operator

Founding engineers from Sunday & Rox, Uber’s 50th FTE and Jump COO, and Factorial’s co-founder

AI

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3.31.26 - The Saronic & Whoop Mafia
Members Only
Kleiner Perkins

3.31.26 - The Saronic & Whoop Mafia

WHOOP’s CTO (ex–Waymo Chief Engineer, Apple Autonomy, $130M co-founder), Saronic engineers launching a16z- and Boost-backed startups, a YC F25 repeat founder, and Whirl AI’s founding engineer
3.12.26 - The Replit & Forethought Mafias
Members Only
A16Z

3.12.26 - The Replit & Forethought Mafias

Replit’s 16th FTE, 1st designer, and Head of AI; Forethought’s founding engineer and co-founder
2.20.26 - Top Founders of the Week
Members Only
Sante

2.20.26 - Top Founders of the Week

Head of ML at PolyAI, Stash’s co-founder post-sale, Lily Robotics and Jyve repeat founders, and Grafana’s post-acquisition builders

Applied AI

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3.18.26 - Founding Operators from Paraform & Hanover Park
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Scale

3.18.26 - Founding Operators from Paraform & Hanover Park

Paraform & Hanover Park founding operators, and early builders across Axiamatic, Grow Therapy, and Andromeda
3.17.26 - 3 Repeat Founders and Lightspeed & GV-backed Founding Engineers
Members Only
Bessemer

3.17.26 - 3 Repeat Founders and Lightspeed & GV-backed Founding Engineers

Atlassian-acquired founder on his 4th act, co-founders of Tamarind Bio & DiligenceSquared, Quince’s CRO, and founding engineers from Gushwork & Translucent
2.20.26 - Top Founders of the Week
Members Only
Sante

2.20.26 - Top Founders of the Week

Head of ML at PolyAI, Stash’s co-founder post-sale, Lily Robotics and Jyve repeat founders, and Grafana’s post-acquisition builders

Fintech

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2.27.26 - Top Founders of the Week
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Top Founders of the Week

2.27.26 - Top Founders of the Week

Co-Founders of Cursor, Freeform, Fluidstack, Orum; creators of Stripe Checkout/Atlas/Connect/Dashboard; Playco CTO & Statsig founding engineer
2.20.26 - Top Founders of the Week
Members Only
Sante

2.20.26 - Top Founders of the Week

Head of ML at PolyAI, Stash’s co-founder post-sale, Lily Robotics and Jyve repeat founders, and Grafana’s post-acquisition builders
2.11.26 - Repeat Greylock and Founders Fund-Backed Founders Exploring Second Acts
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Simple AI

2.11.26 - Repeat Greylock and Founders Fund-Backed Founders Exploring Second Acts

Spinouts from Monaco and Bretton, Twilio Co-Founder free agents, and Garner data leadership building in AI, robotics, and healthcare.

Infrastructure

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3.17.26 - 3 Repeat Founders and Lightspeed & GV-backed Founding Engineers
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Bessemer

3.17.26 - 3 Repeat Founders and Lightspeed & GV-backed Founding Engineers

Atlassian-acquired founder on his 4th act, co-founders of Tamarind Bio & DiligenceSquared, Quince’s CRO, and founding engineers from Gushwork & Translucent
3.12.26 - The Replit & Forethought Mafias
Members Only
A16Z

3.12.26 - The Replit & Forethought Mafias

Replit’s 16th FTE, 1st designer, and Head of AI; Forethought’s founding engineer and co-founder
2.20.26 - Top Founders of the Week
Members Only
Sante

2.20.26 - Top Founders of the Week

Head of ML at PolyAI, Stash’s co-founder post-sale, Lily Robotics and Jyve repeat founders, and Grafana’s post-acquisition builders

Defense

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3.9.26 - The Anduril Mafia
Members Only
Founders Fund

3.9.26 - The Anduril Mafia

Anduril Chief Engineer, Mach Industries CTO, Founding MTS at Physical Intelligence, and other Anduril engineering leaders from SpaceX, CIA, and Uber ATG
2.5.26 - Repeat Founders Backed by Khosla & Bessemer in Stealth
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Crypto

2.5.26 - Repeat Founders Backed by Khosla & Bessemer in Stealth

Former Drift, Turnstile, Machina Labs, Second Measure founders, alongside operators from Goodfire, TRM Labs, and Fibr
1.14.26 - The Etched Mafia
Members Only
Founder

1.14.26 - The Etched Mafia

Senior MTS and founding ML scientists from Etched, defense AI founders from Harmattan, and early product and AI leaders emerging from Aikido Security and Converge Bio.

Biotech

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3.17.26 - 3 Repeat Founders and Lightspeed & GV-backed Founding Engineers
Members Only
Bessemer

3.17.26 - 3 Repeat Founders and Lightspeed & GV-backed Founding Engineers

Atlassian-acquired founder on his 4th act, co-founders of Tamarind Bio & DiligenceSquared, Quince’s CRO, and founding engineers from Gushwork & Translucent
1.14.26 - The Etched Mafia
Members Only
Founder

1.14.26 - The Etched Mafia

Senior MTS and founding ML scientists from Etched, defense AI founders from Harmattan, and early product and AI leaders emerging from Aikido Security and Converge Bio.

Healthcare

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3.26.26 - The Shield AI Mafia
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A16Z

3.26.26 - The Shield AI Mafia

Shield AI’s COO turned founder, Anduril’s former Chief Engineer, Tesla Cybertruck lead and Mach Industries build head, Founders Fund/Index-backed founding ML engineer, and a $100M Felicis-backed founder transitioning out of CEO
3.18.26 - Founding Operators from Paraform & Hanover Park
Members Only
Scale

3.18.26 - Founding Operators from Paraform & Hanover Park

Paraform & Hanover Park founding operators, and early builders across Axiamatic, Grow Therapy, and Andromeda
3.17.26 - 3 Repeat Founders and Lightspeed & GV-backed Founding Engineers
Members Only
Bessemer

3.17.26 - 3 Repeat Founders and Lightspeed & GV-backed Founding Engineers

Atlassian-acquired founder on his 4th act, co-founders of Tamarind Bio & DiligenceSquared, Quince’s CRO, and founding engineers from Gushwork & Translucent

Crypto

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3.18.26 - Founding Operators from Paraform & Hanover Park
Members Only
Scale

3.18.26 - Founding Operators from Paraform & Hanover Park

Paraform & Hanover Park founding operators, and early builders across Axiamatic, Grow Therapy, and Andromeda
2.5.26 - Repeat Founders Backed by Khosla & Bessemer in Stealth
Members Only
Crypto

2.5.26 - Repeat Founders Backed by Khosla & Bessemer in Stealth

Former Drift, Turnstile, Machina Labs, Second Measure founders, alongside operators from Goodfire, TRM Labs, and Fibr
1.22.26 - Cosmos Founder Starting Anew and The Anchorage & BitGo Mafias
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Crypto

1.22.26 - Cosmos Founder Starting Anew and The Anchorage & BitGo Mafias

A Cosmos co-founder, Anchorage founding engineers, and repeat founders within BitGo.

Cybersecurity

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3.26.26 - The Shield AI Mafia
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A16Z

3.26.26 - The Shield AI Mafia

Shield AI’s COO turned founder, Anduril’s former Chief Engineer, Tesla Cybertruck lead and Mach Industries build head, Founders Fund/Index-backed founding ML engineer, and a $100M Felicis-backed founder transitioning out of CEO
2.4.26 - Repeat Founders with $200M Exit, USV-Backed Founder, and Celestial AI's CTO
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Founding Engineer

2.4.26 - Repeat Founders with $200M Exit, USV-Backed Founder, and Celestial AI's CTO

Repeat founders from the Day AI founder’s prior startup, a USV-backed founder, Celestial AI's CTO, and early builders from Uptool, Kindred, and Claroty.
1.14.26 - The Etched Mafia
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Founder

1.14.26 - The Etched Mafia

Senior MTS and founding ML scientists from Etched, defense AI founders from Harmattan, and early product and AI leaders emerging from Aikido Security and Converge Bio.

SaaS

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3.18.26 - Founding Operators from Paraform & Hanover Park
Members Only
Scale

3.18.26 - Founding Operators from Paraform & Hanover Park

Paraform & Hanover Park founding operators, and early builders across Axiamatic, Grow Therapy, and Andromeda

Robotics

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2.27.26 - Top Founders of the Week
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Top Founders of the Week

2.27.26 - Top Founders of the Week

Co-Founders of Cursor, Freeform, Fluidstack, Orum; creators of Stripe Checkout/Atlas/Connect/Dashboard; Playco CTO & Statsig founding engineer
2.2.26 - Poetiq + Kaia Health Founders and Founding Engineers from Fieldguide, Concourse, and RobCo
Members Only
Frontier AI

2.2.26 - Poetiq + Kaia Health Founders and Founding Engineers from Fieldguide, Concourse, and RobCo

Poetiq’s co-founder, Kaia Health’s founding team post-acquisition, and early engineers from Fieldguide, Concourse, and RobCo.
1.21.26 - The Zipline and Baseten Mafias
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AI Infrastructure

1.21.26 - The Zipline and Baseten Mafias

Repeat founders and founding engineers from Zipline, plus Baseten engineers and sales team

American Dynamism

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3.31.26 - The Saronic & Whoop Mafia
Members Only
Kleiner Perkins

3.31.26 - The Saronic & Whoop Mafia

WHOOP’s CTO (ex–Waymo Chief Engineer, Apple Autonomy, $130M co-founder), Saronic engineers launching a16z- and Boost-backed startups, a YC F25 repeat founder, and Whirl AI’s founding engineer
3.26.26 - The Shield AI Mafia
Members Only
A16Z

3.26.26 - The Shield AI Mafia

Shield AI’s COO turned founder, Anduril’s former Chief Engineer, Tesla Cybertruck lead and Mach Industries build head, Founders Fund/Index-backed founding ML engineer, and a $100M Felicis-backed founder transitioning out of CEO
3.19.26 - Repeat Founder, ex GC-backed Founding Team, and an IOI Gold Medalist
Members Only
General Catalyst

3.19.26 - Repeat Founder, ex GC-backed Founding Team, and an IOI Gold Medalist

Posh's Co-Founder, Founding Members of Autoscience, MIT student with IOI gold medals, and key Arc operators