Quentin Fossé
Founder & Editor in Chief
Passive investor since 2019, passionate about UCITS ETFs and index investing. After spending too long searching for a simple tool to detect portfolio overlaps, I built etf-overlap.com. My goal: help European investors build coherent ETF portfolios without hidden concentration risks.
Areas of expertise
UCITS ETFsIndex investingMSCI WorldPortfolio constructionPassive investing
Guides
10 min · May 2026TER and Tracking Difference: the real cost of your ETFThe TER displayed on the KID is not the real cost of your ETF. The Tracking Difference — the gap between the ETF's return and its index — is the only metric that measures what you truly pay. For some ETFs, the listed TER is 0.20% but the TD is negative: the ETF outperforms its index.8 min · May 2026Physical vs synthetic ETF replication: what difference does it make?WPEA physically replicates the MSCI World while CW8 does so synthetically via a swap — yet both track the same index with a tiny gap. Understanding the difference lets you assess counterparty risk and explains why synthetic ETFs qualify for the French PEA.10 min · May 2026MSCI World vs S&P 500: which index should you choose for your ETF?The S&P 500 already accounts for 67% of the MSCI World. Choosing between the two is not neutral: you are either betting on global diversification or on the lasting dominance of large US companies. Performance, composition, risk and overlap compared.10 min · May 2026What is an ETF? Understanding index funds in 10 minutesAn ETF automatically tracks a stock market index for an annual cost below 0.40%. But between listed TER and real cost (Tracking Difference), physical vs synthetic replication, and fund overlap — this guide covers what most articles don't.
News
Markets & Records·3 min·
Wall Street falls as bond and oil concerns weigh on marketsWall Street trades lower on September 15, 2026, as concerns surrounding bonds and oil shape the market backdrop.Markets & Records·3 min·
S&P 500 Falls Amid Anthropic's AI WarningThe Dow, S&P 500 and Nasdaq fall as an Anthropic AI warning unsettles tech traders and the 10-year yield reaches 5%.Macro & Monetary Policy·3 min·
ECB raises interest rates as inflation takes holdThe European Central Bank has raised interest rates in response to inflation that is becoming more persistent.General News·3 min·
S&P 100 ETF removes Nike and Colgate while adding four AI stocksThe S&P 100 ETF changed its holdings by removing Nike and Colgate while adding four stocks linked to artificial intelligence.Macro & Monetary Policy·3 min·
Wall Street Weighs Fed's Monetary Policy After Blowout Jobs ReportMarket divisions emerge on the need for a Fed rate hike following a strong jobs report.Fund Launches & Closures·3 min·
Seraphim launches ETF dedicated to the new generation of the space industrySeraphim introduces a new ETF aimed at boosting the space industry.Macro & Monetary Policy·3 min·
Inflation Rises to 3.3% in EurozoneInflation in the Eurozone reaches 3.3%, a crucial issue for investors.Fund Launches & Closures·3 min·
Goldman Sachs Launches Defined-Outcome ETFs in EuropeGoldman Sachs is launching defined-outcome ETFs in Europe, opening new options for retail investors.