Strategie
Core-Satellite vs. Purely Passive: What to Choose
Key takeaways
- Core-satellite holds 70–90% in a passive index ETF and the rest in active bets.
- The satellite may be a factor ETF, a sector bet, or individual stocks — not undisciplined speculation.
- A purely passive approach is simpler, cheaper, and sufficient for most investors.
- A satellite component only makes sense when you understand it and have clear entry and exit rules.
- Regular rebalancing prevents the satellite from growing beyond its permitted weight.
The core-satellite strategy splits the portfolio into a passive foundation (core) making up 70–90% and a smaller active component (satellite) that deliberately bets on specific factors, sectors, or individual opportunities.
How core-satellite works
The portfolio foundation consists of one or two global index ETFs — typically a combination of world equities and bonds. This part is left untouched and reinvests automatically. The satellite component (10–30%) is a space for informed active decisions: factor ETFs (momentum, value, quality), sector ETFs (technology, healthcare), or in extreme cases individual stocks.
- Advantage: limits the damage from a bad active decision to a smaller part of the portfolio.
- Advantage: satisfies the need to "do something" without jeopardising the overall goal.
- Disadvantage: greater complexity, more monitoring, potentially higher tax burden from the satellite.
Purely passive approach: less is more
A purely passive investor holds one or two ETFs, buys more regularly, and ignores the market. Costs are minimal, tax optimisation is maximal (when using accumulating ETFs and the time test), and cognitive load is low. This strategy outperforms most actively managed funds over a 10+ year horizon — documented by research and practice alike.
When core-satellite makes sense
Core-satellite is reasonable if you have a specific thesis (for example, "emerging markets are structurally undervalued and I want to increase my exposure") or if you are looking for a way to add a factor premium (value, small cap) to the portfolio without full active management. For a purely passive approach and a deeper comparison of strategies, see the article on active vs. passive investing. An overview of available ETFs can be found in the ETF section.
How to rebalance
The satellite must have a pre-defined maximum weight — and you must enforce it. Without regular rebalancing, a 15% satellite can become a 30% dominant position. We cover rebalancing in detail in a dedicated article.
FAQ
What is a core-satellite strategy?
An approach that splits the portfolio into a passive foundation (70–90% in an index ETF) and a smaller active component (10–30%), where the investor deliberately bets on factors, sectors, or individual stocks with a specific thesis.
Who is core-satellite suitable for?
For investors who want to complement a passive foundation with a specific thesis (factor, sector, region) but do not want to manage a fully active portfolio. Not suitable for those who do not have a clear reason for satellite positions.
Is purely passive investing better?
For most retail investors, yes — simpler, cheaper, more tax-efficient, and historically better-performing than most active approaches over a 10+ year horizon. Core-satellite adds value only with a specific, informed thesis.
How large should the satellite be?
A maximum of 20–30% of the portfolio, ideally 10–15% for beginning investors. The key is to have a pre-defined limit and to rebalance regularly so that the satellite does not exceed its permitted weight.