Applications for Autumn 2026 are open
Stella Spark
At a glance
At a glance
At a glance
A two-week intensive entrepreneurship program for ambitious teens aged 14 to 17. Build a real concept, work with real founders, and pitch to a live panel.
A two-week intensive entrepreneurship program for ambitious teens aged 14 to 17. Build a real concept, work with real founders, and pitch to a live panel.
AGE RANGE
14–17
Built for ambitious high schoolers ready to move beyond the classroom.
/01
AGE RANGE
14–17
Built for ambitious high schoolers ready to move beyond the classroom.
/01
AGE RANGE
14–17
Built for ambitious high schoolers ready to move beyond the classroom.
STUDENTS
10–50 per cohort
Small cohorts mean real attention, not just a seat in a crowd.
/02
STUDENTS
10–50 per cohort
Small cohorts mean real attention, not just a seat in a crowd.
/02
STUDENTS
10–50 per cohort
Small cohorts mean real attention, not just a seat in a crowd.
LANGUAGE
English
All sessions, materials, and mentorship delivered in English.
/03
LANGUAGE
English
All sessions, materials, and mentorship delivered in English.
/03
LANGUAGE
English
All sessions, materials, and mentorship delivered in English.
DURATION
2 Weeks
Short, intensive, and built to fit around school.
/03
DURATION
2 Weeks
Short, intensive, and built to fit around school.
/03
DURATION
2 Weeks
Short, intensive, and built to fit around school.
COHORT
Global
Students from Europe, East Asia, Central Asia, and beyond.
/03
COHORT
Global
Students from Europe, East Asia, Central Asia, and beyond.
/03
COHORT
Global
Students from Europe, East Asia, Central Asia, and beyond.
TIMELINE
Application Deadlines
Rolling deadlines, so the earlier you apply, the better your shot : - Early Bird Deadline: Wed, Aug 26th, 2026 - Priority Deadline: Sun, Sep 20th, 2026 - Regular Deadline: Wed, Oct 14th, 2026 - Final Deadline: Sun, Nov 8th, 2026
/04
TIMELINE
Application Deadlines
Rolling deadlines, so the earlier you apply, the better your shot : - Early Bird Deadline: Wed, Aug 26th, 2026 - Priority Deadline: Sun, Sep 20th, 2026 - Regular Deadline: Wed, Oct 14th, 2026 - Final Deadline: Sun, Nov 8th, 2026
/04
TIMELINE
Application Deadlines
Rolling deadlines, so the earlier you apply, the better your shot : - Early Bird Deadline: Wed, Aug 26th, 2026 - Priority Deadline: Sun, Sep 20th, 2026 - Regular Deadline: Wed, Oct 14th, 2026 - Final Deadline: Sun, Nov 8th, 2026
Mentors From
INSEAD
Wharton
Harvard
Oxford
Oxford
ESSEC
Apple
Amazon
Meta
TikTok
TikTok
Why Stella
Why Stella
Founders
Taught by real founders
Every instructor has launched, scaled, and mentored real ventures. When they teach, it's from experience, not from a textbook.
01
Taught by real founders
Every instructor has launched, scaled, and mentored real ventures. When they teach, it's from experience, not from a textbook.
01
Taught by real founders
Every instructor has launched, scaled, and mentored real ventures. When they teach, it's from experience, not from a textbook.
01
Mentors from the world's leading institutions
Alumni and faculty from Harvard, INSEAD, Wharton, Oxford, Cambridge and ESSEC, alongside professionals from Google, Apple, Amazon, Meta and the UN.
02
Mentors from the world's leading institutions
Alumni and faculty from Harvard, INSEAD, Wharton, Oxford, Cambridge and ESSEC, alongside professionals from Google, Apple, Amazon, Meta and the UN.
02
Mentors from the world's leading institutions
Alumni and faculty from Harvard, INSEAD, Wharton, Oxford, Cambridge and ESSEC, alongside professionals from Google, Apple, Amazon, Meta and the UN.
02
/03
Backed by real venture-building credibility
Built on a decade of venture-building experience, with a 9.2/10 rating from past programs participants.
03
Backed by real venture-building credibility
Built on a decade of venture-building experience, with a 9.2/10 rating from past programs participants.
03
Backed by real venture-building credibility
Built on a decade of venture-building experience, with a 9.2/10 rating from past programs participants.
03
A genuinely global peer community
Students work alongside driven peers from Europe, East Asia, Central Asia and the US, in a cohort that reflects the real world of international business.
04
A genuinely global peer community
Students work alongside driven peers from Europe, East Asia, Central Asia and the US, in a cohort that reflects the real world of international business.
04
A genuinely global peer community
Students work alongside driven peers from Europe, East Asia, Central Asia and the US, in a cohort that reflects the real world of international business.
04
Take the first step toward building the world you want to live in
Take the first step toward building the world you want to live in
Mentors From
Mentors From
Stella team brings together alumni and faculty from Harvard, INSEAD, Wharton, Oxford, Cambridge, and ESSEC, alongside professionals who have worked at the UN, Google, Apple, Microsoft, Amazon, Meta and TikTok.
INSEAD
Wharton
Harvard
Oxford
ESSEC
Apple
Amazon
Meta
TikTok
Meet Your Instructors
Meet Your Instructors
Guillaume Catella
Founder @Stella
Education : INSEAD MBA · Wharton · Centrale Lyon · Tohoku University
Education : INSEAD MBA · Wharton · Centrale Lyon · Tohoku University
Guillaume has spent 18 years building companies across France, Singapore and Japan, from a music website with over 1 million monthly views as a student, to a venture builder behind 50 startups that raised $50M. He also founded an impact accelerator that has backed 200+ startups. He's mentored 100+ young entrepreneurs and founders across diverse programs, and has spent the last 5 years teaching entrepreneurship directly to students. He's not here to lecture about business, he's here to show you how it's actually built.
Guillaume has spent 18 years building companies across France, Singapore and Japan, from a music website with over 1 million monthly views as a student, to a venture builder behind 50 startups that raised $50M. He also founded an impact accelerator that has backed 200+ startups. He's mentored 100+ young entrepreneurs and founders across diverse programs, and has spent the last 5 years teaching entrepreneurship directly to students. He's not here to lecture about business, he's here to show you how it's actually built.
Marie-Laure CAILLE
Founder @The Human Factor
Education: London School of Economics · American University of Paris
Education: London School of Economics · American University of Paris
Marie-Laure has spent over 20 years in leadership education and coaching across Singapore, Europe, and Asia-Pacific, from a decade on the faculty at ESSEC Business School to founding The Human Factor, a coaching practice that's helped thousands of leaders grow. She also runs ESSEC's Asia-Pacific Case Competition for Future Leaders, bringing together student teams from across the region to tackle real sustainability and entrepreneurship challenges. A certified executive coach, she's trained and mentored leaders and students alike for over two decades. She's here to help you find your own voice, not follow someone else's script.
Marie-Laure has spent over 20 years in leadership education and coaching across Singapore, Europe, and Asia-Pacific, from a decade on the faculty at ESSEC Business School to founding The Human Factor, a coaching practice that's helped thousands of leaders grow. She also runs ESSEC's Asia-Pacific Case Competition for Future Leaders, bringing together student teams from across the region to tackle real sustainability and entrepreneurship challenges. A certified executive coach, she's trained and mentored leaders and students alike for over two decades. She's here to help you find your own voice, not follow someone else's script.
How To Apply
How To Apply
How To Apply
Apply
01/
Review
02/
Our team will review all applications and contact successful applicants.
Enroll
03/
Complete enrollment with your parents and lock in your spot.
Cohort
04/
Connect with ambitious students worldwide. Introduce yourself, meet mentors, join the community.
What They're Saying
based on 300+ reviews
9.2/10
Arsenii
Online Program 2025
This experience gave me invaluable knowledge and inspiration. Many ideas became clearer, and my perspective on business grew deeper and more confident.
Anahita
Online Program 2023
The guidance was instrumental in overcoming challenges and growing both professionally and in working with a team. The mentorship had a lasting positive impact on my aspirations
Nil
Online Program 2024
I had a really amazing experience, with a different perspective on our problems and a positive environment throughout. I see M. Catella as a role model and mentor who changed my mindset for the better, helping me understand the process of youth entrepreneurship.
Siri, EQUO International
Vietnam Program
One of the most unforgettable experiences in work and life ever! We received detailed feedback from experienced mentors and judges, and felt strongly supported by the organizers and inspired at every stage of the program.
Oliver Bennet
Founder, Lune Skincare
Working with Astra was a game-changer for our brand. They didn’t just redesign our logo — they helped us rethink our entire identity.
Isabelle Montgomery
Brand Manager, Housemood
What I loved most about Astra was how deeply they listened. They brought our vision to life in a way that felt both original and totally aligned with who we are.
Viktoria Clark
CEO, Nimma
We've worked with a lot of creative agencies, but Astra feels like a true partner. They care about the outcome as much as we do.
Phoenix Wilder
Co-founder, LEXX
After our rebrand with Astra, we saw a measurable boost in engagement and credibility. Their team is equal parts creative and strategic — a rare combination.
Previous
Next
Arsenii
Online Program 2025
This experience gave me invaluable knowledge and inspiration. Many ideas became clearer, and my perspective on business grew deeper and more confident.
Anahita
Online Program 2023
The guidance was instrumental in overcoming challenges and growing both professionally and in working with a team. The mentorship had a lasting positive impact on my aspirations
Nil
Online Program 2024
I had a really amazing experience, with a different perspective on our problems and a positive environment throughout. I see M. Catella as a role model and mentor who changed my mindset for the better, helping me understand the process of youth entrepreneurship.
Siri, EQUO International
Vietnam Program
One of the most unforgettable experiences in work and life ever! We received detailed feedback from experienced mentors and judges, and felt strongly supported by the organizers and inspired at every stage of the program.
Oliver Bennet
Founder, Lune Skincare
Working with Astra was a game-changer for our brand. They didn’t just redesign our logo — they helped us rethink our entire identity.
Isabelle Montgomery
Brand Manager, Housemood
What I loved most about Astra was how deeply they listened. They brought our vision to life in a way that felt both original and totally aligned with who we are.
Viktoria Clark
CEO, Nimma
We've worked with a lot of creative agencies, but Astra feels like a true partner. They care about the outcome as much as we do.
Phoenix Wilder
Co-founder, LEXX
After our rebrand with Astra, we saw a measurable boost in engagement and credibility. Their team is equal parts creative and strategic — a rare combination.
Prev
Next
Arsenii
Online Program 2025
This experience gave me invaluable knowledge and inspiration. Many ideas became clearer, and my perspective on business grew deeper and more confident.
Anahita
Online Program 2023
The guidance was instrumental in overcoming challenges and growing both professionally and in working with a team. The mentorship had a lasting positive impact on my aspirations
Nil
Online Program 2024
I had a really amazing experience, with a different perspective on our problems and a positive environment throughout. I see M. Catella as a role model and mentor who changed my mindset for the better, helping me understand the process of youth entrepreneurship.
Siri, EQUO International
Vietnam Program
One of the most unforgettable experiences in work and life ever! We received detailed feedback from experienced mentors and judges, and felt strongly supported by the organizers and inspired at every stage of the program.
Oliver Bennet
Founder, Lune Skincare
Working with Astra was a game-changer for our brand. They didn’t just redesign our logo — they helped us rethink our entire identity.
Isabelle Montgomery
Brand Manager, Housemood
What I loved most about Astra was how deeply they listened. They brought our vision to life in a way that felt both original and totally aligned with who we are.
Viktoria Clark
CEO, Nimma
We've worked with a lot of creative agencies, but Astra feels like a true partner. They care about the outcome as much as we do.
Phoenix Wilder
Co-founder, LEXX
After our rebrand with Astra, we saw a measurable boost in engagement and credibility. Their team is equal parts creative and strategic — a rare combination.
Previous
Next
FAQ
FAQ
FAQ
Who is Stella for?
Stella is for ambitious, self-motivated teenagers aged 14–17 who want to move beyond theoretical learning to think and act like founders
What does a typical week look like?
Do students actually build something?
What language is the program taught in?
Who teaches the program?
What are the dates?
What is the application deadline?
How much does Stella cost?
Is there a certificate at the end? How to graduate?
What's the cohort size / student-to-instructor ratio?
Can students from any country apply?
How much time commitment is required?
Do students need to travel?
Does Stella provide financial aid?
Who is Stella for?
Stella is for ambitious, self-motivated teenagers aged 14–17 who want to move beyond theoretical learning to think and act like founders
What does a typical week look like?
Do students actually build something?
What language is the program taught in?
Who teaches the program?
What are the dates?
What is the application deadline?
How much does Stella cost?
Is there a certificate at the end? How to graduate?
What's the cohort size / student-to-instructor ratio?
Can students from any country apply?
How much time commitment is required?
Do students need to travel?
Does Stella provide financial aid?
Who is Stella for?
Stella is for ambitious, self-motivated teenagers aged 14–17 who want to move beyond theoretical learning to think and act like founders
What does a typical week look like?
Do students actually build something?
What language is the program taught in?
Who teaches the program?
What are the dates?
What is the application deadline?
How much does Stella cost?
Is there a certificate at the end? How to graduate?
What's the cohort size / student-to-instructor ratio?
Can students from any country apply?
How much time commitment is required?
Do students need to travel?
Does Stella provide financial aid?
Didn’t find the answer? Ask us about our services!
Didn’t find the answer? Ask us about our services!
