Run a book before anyone hands you real money.
A simulated $1,000,000 portfolio priced off live market data, run under a real mandate, for a client who behaves like one — and reviewed by people who have done the job. No member capital is ever pooled, collected or managed.
Live prices, eight of the 40 instruments currently tradable · last refreshed 28 Oct 2026, 17:45 UTC · the universe is expanding across asset classes
The book
- Live prices — repriced through the trading day, so the book moves whether or not you are watching it
- A mandate you have to keep — position and sector caps, a minimum number of holdings, a cash band, and sometimes an exclusion
- Orders refused, with the reason — a trade that would breach a constraint does not go through, and the message tells you which line it crossed
- A written thesis per position — what has to be true, and what would tell you it is not, recorded before the price moves
- Benchmarked — the index is on the same chart, rebased to your opening capital
The client
- They add capital — and expect it put to work, not just parked
- They call it back — on a seventy-two hour deadline, which you fund by selling something, in the order you choose
- They revise the mandate — and the book has to come back into line
- The committee asks questions — about your largest position, your sizing, your correlated bets, in writing
- They form a view of you — and it is not only about the return
Read by people who have done the job.
Your written answers to the committee, and the reasoning you disclose for every trade, are read by reviewers with investment backgrounds. They score the judgement on show and leave you a note explaining it.
They are scoring how you think, not whether the trade worked. A well-argued position that lost money scores above a lucky one — which is the entire reason you are asked to write the reasoning down before the outcome is known.
Those scores feed your standing with the client alongside the measurable things. It is the closest thing to having your memo pulled apart in a real investment committee, which is the experience that actually moves people on.
It counts, even though the capital does not.
Every decision is recorded as you make it — what you bought, at what price, why, what you said would change your mind, and what the committee made of it. None of it can be edited after the fact, which is what makes it worth anything.
That record lives on your profile and travels with you across the platform: into your research, your standing in the network, and what a firm or an allocator sees when they look you up here.
The capital is simulated. The track record of how you reason under constraints, deadlines and scrutiny is not, an asset a recruiter can't simply read off a CV.
One pass at the real thing.
Take a mandate, allocate $1,000,000 across eight live names, and say how you have treated the client. The book is priced at the last refresh, checked against the constraints, and put in front of them. This runs in your browser and saves nothing.
Three of the 5 a client can put you on. In a real book the client chooses, and revises it whenever they like — you find out when it lands on your desk and the holdings have to come back into line.
Steps of $50,000. The percentage under each is its weight in the book, checked against the mandate you just took.
In a real book these accumulate on their own: the client asks, and you either answer by the deadline or you do not. Set them here to see what they are worth.
Try it: build a book that beats the index and keeps every constraint, then ignore three requests. Performance does not save a relationship you are not tending, which is something most people learn too late.
Mandate check
What the client makes of it
Satisfied
Nothing allocated yet, and no view either way.
Not included in this demo: what the committee made of your reasoning. In a real book a reviewer reads it, scores it, and it reflects in this same panel — as does a drawdown measured over months rather than an afternoon.
Where you'll need a book of your own
- The client depositing, and calling capital back on a deadline you have to fund
- Mandate revisions arriving unannounced, with the book already offside
- Real questions from the committee — reading and scoring your answer
- A thesis and a disconfirming condition recorded against every position
- Months of NAV history against the index, and a record that stays on your profile
High fidelity experience
What makes this worth the hours is that somebody on the other side has opinions and a deadline. Reading about position sizing and being forced to fund a redemption out of a concentrated book are different kinds of knowledge, reflected in the experience.
Your standing with the client is deliberately not a scoreboard for returns. A manager who beats the index while breaching the mandate and ignoring the committee is not a manager an allocator keeps, and the number says so.
Realistic mechanics
Clients redeem capital from their portfolio at will, and they can commit additional deposits if they're happy with performance, these actions are accounted into your simulated fund.
Here, return and drawdown are measured against a capital base that scales with client flows, the way a real fund accounts for units. A deposit is not performance and a redemption is not a loss. Only the market moves the numbers.