Nordsight — learn to invest, properly

In Module 3 you split the portfolio into a boring core and a small set of satellites. Now you build your first satellite. A satellite isn't a random stock that caught your eye. It starts as a theme — a slice of the world you genuinely understand — and only later becomes a named position. This lesson is about getting the theme right, because everything downstream depends on it.

The temptation is to skip this step. You read a headline, a number looks big, and you want in. That feeling is normal. It's also exactly how most retail satellites turn into expensive lessons. So before any instrument, before any "is now a good entry," we slow down and answer one question: do you actually understand this, or did you just hear about it?

The circle of competence

Picture a circle. Inside it are the things you understand well enough to have an opinion that isn't just an echo of someone else's. Maybe you work in logistics and you grasp how shipping rates move. Maybe you've renovated flats and you know what drives building-materials demand. Maybe you're a nurse and you read medical-device approvals for a living. That knowledge is real, and it's yours.

The size of the circle doesn't matter. What matters is knowing where its edge is. The expensive mistakes happen at the edge, when you mistake "I've heard of this" for "I understand this" and step outside the circle without noticing. A small, honest circle beats a large, imaginary one.

The rule

A satellite theme has to sit inside your circle of competence— or close enough to its edge that you can do the reading and genuinely get inside it. If the only thing you can say about a theme is what a headline told you, it's outside the circle. That's fine. It just isn't your satellite.

The one-sentence test

Here's the test that does most of the work. Try to say, in one plain sentence, why this theme should grow in value over the years you plan to hold it. No jargon. No charts. Just cause and effect a friend with no finance background would follow.

If you can do that cleanly, you have the beginnings of a thesis. If the sentence comes out vague ("it's the future," "everyone's talking about it," "it can only go up"), you don't understand the theme yet. You understand the hype around it, which is a different thing and a far worse reason to commit money.

Passes the test

A real one-sentence thesis

"Aging populations across Germany and the EU mean steadily rising demand for medical devices over the next decade, and the companies that make them benefit from that." You can name the cause, the timeframe, and who benefits. It can still be wrong — but it's a thesis you can test.

Fails the test

Hype dressed as a thesis

"Everyone's saying this sector is the next big thing and it's already up a lot this year." That's not a reason the theme grows — it's a description of recent price and other people's excitement. There's nothing to test and nothing to hold onto when the price drops.

"I read a headline" is not understanding

A headline gives you a conclusion without the reasoning. It tells you something is big or growing, but not why, not for how long, and not what would prove it wrong. Understanding is the reasoning, not the conclusion. If you can't reconstruct the argument yourself, you're renting someone else's — and you'll hand it back the moment the position turns red.

A quick gut-check: can you name one thing that would make you change your mindabout the theme? If you understand it, you can. If you can't name anything that would falsify it, you don't have a thesis. You have a hope, and hope reacts badly to drawdowns.

The FOMO tell

If the urgency to act comes from the fear of missing outrather than from anything you understand about the theme, that's the tell. FOMO is loudest right after something has already run up — which is often the worst moment to commit, and always the worst reason to. A theme that's genuinely inside your circle will still be there next week. The reading isn't going to expire.

From theme to a named satellite mandate

A theme is a direction. A satellite mandateis that direction written down so concretely that future-you can hold yourself to it. This is the bridge from Module 3's core/satellite structure to an actual position. You're not picking an instrument yet — that comes in later lessons. You're writing the brief the instrument will have to satisfy.

1
Name the theme in plain language
One short label you'd recognise in a year. "EU defense spending," "water infrastructure," "AI compute infrastructure." Categories to think about, not instructions to buy. The name is just a handle.
2
Write the one-sentence thesis
The cause-and-effect sentence from the test above. If you can't write it cleanly, stop here — the theme isn't ready.
3
State what would prove it wrong
One or two developments that would tell you the thesis has broken. This is what lets you exit on logic instead of panic.
4
Set the role and the size band
How much of the portfolio this satellite is allowed to be, per the limits you set in Module 3. A mandate without a size cap isn't a satellite — it's an open invitation to overcommit.

Notice what this gives you. When the position drops, you don't scramble for a reason to stay or go — you re-read the mandate. Is the thesis intact? Has anything on the "proves it wrong" list happened? The decision was made calmly, in advance, by the version of you that wasn't staring at red numbers.

Try first

You're drawn to a fast-moving theme everyone's talking about. You can't quite write the one-sentence thesis, but you're sure you'd figure it out, and you don't want to miss the move. What's the honest call?

What's next

Once you have a theme inside your circle, a clean one-sentence thesis, and a falsification line, you've got a real satellite mandate. The next lessons cover how to express that theme through an actual instrument without smuggling in concentration or hidden overlap with your core. The thinking you did here is the part that protects you later. The instrument is just plumbing.

Pick a theme you actually understand