About us

Two founders, one standard of proof.

Norbury Capital was founded in Amsterdam in 2024 by Thijs Buitenhuis and Ernest van Tuyll — a two-person team running an AI-enabled research process with the output of a full analyst bench, and more than 25 years of combined experience assessing investment ideas.

Thijs Buitenhuis

Thijs Buitenhuis

Founder

From a young age, Thijs (1987) was always curious and loved investigating things. Initially he dreamed of becoming a journalist, captivated by the idea of writing stories and exploring new topics. Enthused by his father, this curiosity extended to the stock market; he owned his first stocks when he was eleven. Before founding Norbury, Thijs led the public equities team at Egeria, managing a portfolio of over $150m, having begun his career as an Equity Analyst at Kempen & Co.

Thijs develops networks around companies and stocks — employees, management, suppliers, competitors, analysts, shareholders and other funds — and enjoys the competition the markets offer: the ability to learn something new, or meet someone interesting, on a daily basis.

Ernest van Tuyll

Ernest van Tuyll

Founder

Ernest's (1984) family has instilled him with a great passion for the intellectual pursuit of debating what is true, be it in science, history or art — no Van Tuyll family dinner is complete without a vivid debate. Investing allows him to continue that passion on a daily basis. Before teaming up with Thijs, Ernest spent twelve years as an analyst and fund manager of the Juno Selection Fund, gaining deep experience in stock picking: finding hidden gems and leaving no stone unturned.

After more than 1,000 company interactions he has heard many management spins. His ambition is for Norbury to compete with the best fund managers out there — by mastering the under-the-hood processes that outside investors never perceive, but which are ultimately crucial for sustained performance.

Before the game begins

Thijs learned his instinct long before investing. As an eight-year-old, his father took him to the old Ajax stadium. Walking up, the game had not started yet — and that was the fascination. The noise building around the ground. The crowd conversations before the first whistle. Everything that decided the atmosphere of the match happened before kick-off.

"The real fascination was outside — before the first whistle. That still shapes how we invest."

Ernest naturally hunts for signals others miss. Creative ideas grounded in rigorous data analysis. An avid history lover, he automatically looks for historical context that matters for the stock. Hiring patterns drawn from LinkedIn data. Subtle behavioral change inside organizations. Insight comes from connecting fragments early.

Years later, those instincts became an investment philosophy: fundamental change appears first in behavior, not headlines — in what employees, suppliers, competitors and customers do before it shows up in the numbers. Thijs reads the atmosphere around companies; Ernest hunts the data for what others miss — and both improve through honest post-mortems, documented in the fund's investment journal.

Thijs Buitenhuis and Ernest van Tuyll in Amsterdam
Prinsengracht, Amsterdam
Where does the name Norbury come from?

A reminder to stay humble.

The name Norbury Capital is a nod to Sherlock Holmes and an important lesson from the story "The Adventure of the Yellow Face" by Sir Arthur Conan Doyle. In this tale, Holmes encounters a mystery involving a person living in a small cottage in Norbury. Despite being confident in his deductions, Holmes's theories turn out to be completely wrong — the true explanation is unexpectedly innocent.

After realizing his mistake, Holmes humbly acknowledges his error and advises Dr. Watson to remind him of "Norbury" if he ever appears overly confident in his deductions. This serves as a lasting reminder to approach every case with humility, open-mindedness, and an awareness that even the most brilliant minds can be wrong.

Norbury Capital embodies this philosophy. In the unpredictable world of investing, where wrong assumptions can easily lead to mistakes, our name serves as a constant reminder to stay humble, consider all possibilities, and be prepared for the unexpected. Just as Holmes learned from Norbury, our investment approach is rooted in thorough analysis, vigilance, and a willingness to adapt to new information.