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Quantitative Portfolio Simulator (S&P 500)

Design your own systematic strategy by choosing the fundamental factor, asset concentration level, and mathematical weight distribution method. The system calculates the weights and simulates the rule day by day over the whole history, from December 1998.

Momentum: %
Value: %
Quality: %
Growth: %

Total Return:

Recent days
today's holdings
Walk-forward
backtested rule, monthly rebalance
1 Day: -1 Mo.: -
2 Days: -3 Mo.: -
3 Days: -6 Mo.: -
4 Days: -YTD: -
5 Days: -1 Year: -

Two different things, so they are in two columns, exactly as in Model Portfolios. The left one is the portfolio you have just configured, priced over the last few sessions with your own weights. The right one is that same rule run forward through history, scoring each date with only what was public that day and rebalancing monthly; its curve has one point per month, so it cannot give you a single day. Over one to five days a portfolio moves mostly on noise; the annualized figures are in the box beside this one.

Your portfolio's real risk:

Asset Breakdown & Calculated Weights

Ticker Sector Last Price 1 Day Ret. 1 Wk Ret. 1 Mo Ret. 3 Mo Ret. Z-Score Algorithm Weight
Press "Run Simulation" to see the composition.

Save what you design

The thing almost nobody catches in time: the big insider buys — executives and major shareholders putting in their own money — the same day they report them to the SEC, with the Form 4 linked. It takes three steps and none of them costs anything: create the account, confirm the email we send you, then switch the alert on in your profile (the icon at the top right). It starts off, it goes off again with the same click, and nothing else lands in your inbox. Along the way all three are saved: your simulator portfolios, your personal portfolio and your Academy progress, synced across devices.

No card. No spam.

What this simulator does

You choose three things — the factor, how many companies and how the weight is split — and the engine builds that portfolio from the best scored of the 466 companies scored today, works out the weights and prices it with real closes, dividends reinvested, next to the engine's equal-weighted S&P 500 (every index member on each date, in equal parts). You pick from 5 factors and 10 ways to split the weight, and on top of that every weight can be moved by hand.

It is the same machinery behind the model portfolios, on the same point-in-time SEC fundamentals; the difference is that here you set the rules. What comes out is not a recommendation: it is what that rule would have done with the data available at each moment.

Data as of Sep 18, 2026.

S&P 500 market gravity