How professional desks think about risk on a single position.

Ask a regular person why they're buying a stock and they'll usually answer with a story. "I think Apple's going to release a great phone." "Tesla's a good company." "This dip looks like a bargain."

Ask a professional desk the same question and they'll answer with three numbers.

Those three numbers are the foundation of how serious institutional traders evaluate every single position. They're not magic. They're not secret. But almost no retail trader uses them — which is a big part of why retail traders lose money.

The three numbers

For every position a professional desk considers, they want to know:

1. Where do I get in? The entry price.
2. Where am I wrong? The invalidation price — the level that proves the idea was bad.
3. Where am I right? The target — the level the position needs to reach for the trade to make sense.

That's it. Three numbers. Entry, invalidation, target. No professional desk takes a position without knowing all three before they click buy.

Why this matters more than you think

When you only know the entry price, you can't really do anything. You can hope. You can panic. You can keep watching. But you can't make a decision because you have no reference points.

When you know all three numbers, you've already made the only decision that matters. Before the trade is even live, you know:

• Exactly when you'll exit if it goes wrong.
• Exactly what success looks like.
• How much you stand to lose vs. how much you stand to gain.

That last point is what professionals call risk-reward. If you can lose $1 to potentially make $3, that's a 1:3 risk-reward. If you can lose $1 to potentially make $0.50, that's terrible — even if you think the trade is "obvious."

Sizing the position

Once you know the three numbers, there's a fourth thing professionals figure out before anything else: how big the position should be.

The rule most desks use is simple. Decide ahead of time how much of your account you're willing to lose if the trade is wrong. A common rule is 1% — meaning the maximum loss on any single position is no more than 1% of total capital.

Then size the position so the distance between your entry and your invalidation matches that 1%. If you're wrong, you lose 1%. If you're right, you make a multiple of that.

What this looks like inside Sentinel

Every setup the engine surfaces — and every setup the desk approves — comes with the three numbers attached. You see the entry, the invalidation, and the target on your dashboard. You see what the desk concluded about the risk-reward.

That doesn't tell you what size to take or whether to take the position at all. That's your call. Your account, your name, your control. But the structure of the setup is laid out the same way a professional desk would lay it out for itself.

The point of decision support isn't to make decisions for you. It's to give you the same reference points the professionals use, so the decision you make is a better one.