Concentration is how portfolios get hurt: one holding, or one sector, having a bad year at the wrong moment. Diversification is the unglamorous fix — enough separate businesses that none of them gets to decide your result.
In the app, sector weight is the fastest tell. When one sector grows into a large slice of everything you own, you're making one bet through several names, and that is concentration risk.
One sector at 34%. Whether that's too much is your call — the Diversification Target widget compares it with the mix you set.
Educational content only. It is not personal financial advice.