Prothena Corporation PLC

NASDAQ:PRTA

Economic Moat is a concept popularized by Warren Buffett to describe a company's durable competitive advantage. It represents the 'moat' that protects a company from competitors and helps it sustain profitability over the long term. Our analysis of the past 10 years showed that companies with a wide economic moat significantly outperformed the market, delivering +645% returns compared to +189% for the S&P 500.

Our research into Economic Moat performance spans the past 10 years and focuses on companies with a wide economic moat. For this analysis, we calculated the average stock price returns of these companies, comparing them to the performance of the S&P 500 index over the same period.

The results were compelling: wide moat stocks achieved a remarkable +645% average return, compared to +188% for the broader market. This difference highlights the long-term benefits of investing in businesses that can maintain their market position and pricing power over time.

Note: This research does not account for survivorship bias. Past performance is not indicative of future results.

Determining whether a company has an economic moat requires both a deep dive into financial metrics and a qualitative assessment of its competitive position. Our analysts conduct a rigorous evaluation that focuses on identifying structural advantages that enable a company to sustain profitability and defend its market share over the long term.

The process begins with an analysis of a company’s historical financial performance. We assess how consistently the company has generated returns above its cost of capital and whether those returns have been stable or improving. However, financial performance alone doesn’t reveal the full picture. To understand the sources of these advantages, we evaluate five key drivers of economic moats:

By examining these factors in combination with a company’s financial performance and market positioning, we classify each company into one of three categories:

This rigorous evaluation ensures that our moat ratings are both comprehensive and reliable, giving investors the tools they need to make well-informed, long-term decisions.