Core-Satellite Investing Strategy: Core + Satellite Policy

A decision-first guide to core-satellite portfolios: define roles, cap satellite risk, set review triggers, and avoid silent concentration drift.

Core-satellite investing is a portfolio design where a diversified core holds your default exposure, while a smaller satellite sleeve expresses selective convictions. It works only when the roles are explicit: the core has a written mandate (what it owns and why), and the satellite has hard caps, review triggers, and clear exit rules. Use this page to draft a simple policy, decide what evidence can grow or shrink the satellite, and identify the most common failure mode—silent concentration drift that turns a stable plan into a fragile bet.

Visual Playbook

Step 1

Write the core mandate (not just the weight)

Define what the core is allowed to hold, why it exists (default exposure, resilience, simplicity), and what would justify changing it. A core that qui...

Step 2

Cap satellite risk, not just position count

Put hard caps on satellite sleeve size and per-position weight, then sanity-check look-through risk (sector, factor, and single-theme overlap). The go...

Step 3

Use different review triggers for each sleeve

Review core for drift, costs, and whether it still matches your default exposure goal. Review satellite for thesis validity, valuation vs. your own as...

Comparison Breakdown

1) Write the core mandate (not just the weight)

Define what the core is allowed to hold, why it exists (default exposure, resilience, simplicity), and what would justify changing it. A core that quietly accumulates exceptions becomes a second satellite, so keep the mandate narrow, low-drama, and easy to review.

2) Cap satellite risk, not just position count

Put hard caps on satellite sleeve size and per-position weight, then sanity-check look-through risk (sector, factor, and single-theme overlap). The goal is that no single conviction idea can dominate total portfolio behavior, even when correlations rise.

3) Use different review triggers for each sleeve

Review core for drift, costs, and whether it still matches your default exposure goal. Review satellite for thesis validity, valuation vs. your own assumptions, and rule adherence. Most failures come from using price moves as the only trigger instead of predefined evidence checkpoints.

4) Draft a one-page policy you can actually follow

Checklist: core target range; satellite max cap; per-position max; rebalancing rule (what triggers action and what does not); and a pre-commitment rule for adding risk (e.g., no increases without a written update to the thesis + risk case). If you cannot write it in one page, it is probably too complex to execute consistently.

5) Misuse warnings: the common ways this breaks

Core-satellite fails when the satellite becomes a performance-chasing sleeve, when exceptions creep into the core, or when you keep “small” positions that add up to hidden concentration. If you do not have time to review the satellite with discipline, a simpler core-only approach often beats a complex plan you cannot maintain.

Action Checklist (Shareable)

Write your decision objective in one sentence before reading price action.

Run at least one relevant case in KeepRule Scenarios (/scenarios).

Tie the action to one principle and one invalidation trigger (/prompts).

Set position size from downside tolerance first, then expected upside.

Schedule a 7-day post-mortem using the same checklist before any new change.

Share Kit

FAQ

What belongs in the “core” vs the “satellite”?

The core is your default exposure: holdings you would keep even when you are not actively researching new ideas. The satellite is for explicit theses you are willing to monitor and update. If you cannot explain why a position exists and what would invalidate it, it should not live in the satellite.

How do I stop the satellite sleeve from becoming hidden concentration?

Use caps (sleeve cap + per-position cap), then review look-through exposure: top holdings, sector/theme overlap, and any single driver that can dominate outcomes. Track changes over time so you catch “creep” early, not after one theme becomes half the portfolio.

When is core-satellite a bad idea?

If you do not have a repeatable process for monitoring theses, or your biggest risk is behavior (overtrading, reacting to headlines), adding a satellite sleeve can increase mistakes. In those cases, a simpler core-only plan with fewer decisions may be the more disciplined option.

Should rebalancing be mechanical or thesis-based?

Treat them differently: core rebalancing is usually mechanical (drift back to policy), while satellite changes should be thesis-based (new evidence, invalidation triggers, or risk case changes). Mixing the two often creates a loop where you “rebalance” into broken theses or sell winners with no decision rule.

What is a valid reason to increase (or cut) the satellite?

Increase only when you can update the thesis in writing, identify what changed, and show how the portfolio-level risk stays within caps. Cut when the thesis is invalidated, the downside/risk case worsens, or you repeatedly break your own rules. Price movement alone is rarely a sufficient reason without an evidence-based explanation.