Interactive finance tools that run in your browser. Company data comes from the same nightly update as the rest of the site.
Decide the loss you can accept first; the number of shares follows from the distance to your stop.
List what you own. S&P 500 index funds (SPY, VOO, IVV, SPLG, RSP) are opened up into their companies, so overlap with your single stocks shows.
Ticker and current value in dollars. Saved in this browser only.
S&P 500 weights here are by total market value, which is close to, but not exactly, the index’s float-adjusted weights. Companies outside the S&P 500 are counted as “not covered”.
Volatility, drawdowns, beta, value at risk, which holding carries the risk, correlations and the efficient frontier, from five years of weekly returns.
A household projected year by year: pay, taxes, spending, debts, goals and Social Security, run through 1,000 markets, with what-ifs and the savings it would take.
Retirement withdrawals with guardrails against the 4% rule, and tax-loss harvesting stock by stock against an index fund, each through thousands of simulated markets.
Build spreads, straddles and condors. Payoff at expiry and today, Black-Scholes prices and the Greeks.
Open →How much to bet when you have an edge, and what happens when you bet too much.
Open →Quote a bid and ask against traders who know more than you, with Bayesian updating.
Open →