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Learn, try and understand your own portfolio.

Learn with your own numbers, test a buy or a sell before you make it, and see simply where your risk is and what each decision would change. With the calculations big funds use every day, which rarely reach private investors — explained in plain words.

See it on an example portfolio › Start free

Launch offer The paid plan, free for three months on accounts opened until 31 Dec 2026. No card, no automatic charge. How it works ›

  • Free to start, no card
  • Analysis, not advice — it never places orders

Big funds measure their risk with maths your broker's app doesn't show you.

On the demo portfolio, invented

Share of risk

92% of the risk is carried by 3 of the demo's 7 holdings

How much of the portfolio's volatility each position actually causes.

Open the lesson ›
Money and risk of the three holdings that carry the most risk, on one scale

Sphinx Risk does it for private investors,
on their own portfolio, in plain words.

Learn with your own numbers

Every lesson is worked on your own portfolio: what a measure means, and what it says about what you hold.

Open the lessons ›
Sharpe ratio
The idea

Return per unit of volatility: how much you were paid for the swings you put up with.

On this portfolio 0.44
  1. Annual return +7.9% ÷ annual volatility 17.9%.
  2. 0.0794 ÷ 0.1793 = 0.44 (with a zero risk-free rate).
Open this lesson on the demo ›

Try a buy or a sell before you make it

Pick a trade and the same engine measures your portfolio twice: as it is now, and with the trade in it.

Try it on the demo ›
The simulator, on the demo
NowAfterChange
Its share of the risk 62% 54% −8 pp
Portfolio volatility 23.2% 21.2% −2.0 pp
Equal positions it behaves like 5.3 5.8 +0.5
In words

Its share of the risk would go from 62.4% to 54.4%: more of the risk than of the money, because it moves more than the rest or with it. The portfolio's annual volatility would fall from 23.2% to 21.2%, 2.01 points less.

Open this trade in the simulator ›

Understand your risks, simply

Which holdings carry your risk, how far your portfolio has fallen, and what each decision would change.

See the risk view ›

And every Monday, an email tells you what changed in your week.

One holding of the demo portfolio
ARBArbor Industrial
17% of the money
10% of the risk
Maximum drawdown−32.0%the demo portfolio's worst fall from a peak

Your broker tells you what you have.
Not what you are exposed to.

On the demo portfolio, invented

Export your trades from your broker, drop the CSV or Excel file, confirm: the whole history measured in a minute. Free to start, no card, and nothing is saved until you confirm it.

Start free See it on an example portfolio ›

No advice, no orders, no promised returns. The full limits ›