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
ETF News·3 min·
Invesco cuts WPEA TER to 0.19% — what it means for PEA investorsWPEA becomes the cheapest PEA-eligible World ETF on the French market. We calculate the 20-year impact.Regulation·3 min·
ESMA strengthens ETF cost transparency rules: what changes from July 1, 2026The new directive requires issuers to disclose the actual TER (including transaction costs), not just the headline TER.ETF News·2 min·
CW8 now listed on Euronext Amsterdam — what does it mean for investors?Amundi has obtained dual listing for CW8 on Euronext Amsterdam, broadening access to European investors outside France.