Philosophy
The Duramen Principle
Duramen is the heartwood of a tree — the dense, permanent inner core that does not decay even as the outer rings grow and change.
We are named for what we own: businesses whose competitive advantage is so deeply formed, so structurally embedded in the economic landscape, that time strengthens rather than weakens their position. The outer rings of markets — sentiment, valuations, narratives, macro cycles — fluctuate constantly. The duramen of a great franchise does not.
Our task is to identify the duramen, pay a rational price for it, and hold it for as long as the core remains intact.
Four Core Beliefs
I
Markets misprice permanent moats
Narrative-driven selloffs create entry points in businesses whose intrinsic value is substantially unchanged. Fear is the source of the discount. Patience is the edge.
II
Time favors the exceptional business
Holding compounders for 10+ years eliminates the need to be right on timing, macro, or market direction. The business does the work; the investor simply does not interfere.
III
Concentration produces superior returns
Every dollar allocated to the 11th-best idea is a dollar taken from the best idea. We run 8–10 positions. Dilution is the enemy of compounding.
IV
Moat first. Price second.
A business that cannot sustain competitive advantage for 20 years does not belong in the portfolio regardless of how attractive the price appears today.
The Five Moat Sources
Efficient Scale
Natural monopolies in markets too small for a second viable competitor. Credit rating agencies, exchange clearinghouses, financial infrastructure. The market itself prevents meaningful competition.
Permanent
Switching Costs
Businesses so embedded in customer operations that migration risk outweighs any plausible benefit. ERP software, compliance platforms, validated pharmaceutical systems. Customers stay because leaving is more expensive than the alternative.
Permanent
Network Effects
Products that become more valuable as more people use them, creating a self-reinforcing competitive flywheel. Payments networks, index licensing, professional data standards.
Very High
Intangible Assets
Brands, patents, regulatory licenses, and proprietary data accumulated over decades that no competitor can replicate regardless of capital deployed. Luxury brands, academic publishers, pharmaceutical IP.
Very High
Cost Advantages
Structural production or distribution cost edges that persist regardless of management quality. Irreplaceable manufacturing process technology and physical infrastructure.
High
The 20-Year Ownership Test
"Will this business earn superior returns on capital in 2046 with the same confidence as today?"
Every potential investment must pass this question before any valuation work begins. If the answer is anything other than a clear yes, we do not invest. If the answer is yes, we then ask whether the current market price offers a meaningful margin of safety to our independently estimated intrinsic value.
Only when both conditions are satisfied — permanent moat, rational price — does capital move. This discipline eliminates more ideas than any valuation model could.