Fractional Shares

A share trading at $900 used to be all or nothing. Most large US brokers now accept an order stated in dollars instead, so $50 buys about one eighteenth of that share and the account records 0.0556 shares rather than a whole one. The course's lesson on starting amounts treats this as the thing that changed the math for small accounts.

The pieces behave like the whole. A fractional holding receives its fraction of any dividend, and its value tracks the price in exactly the same proportion. What it usually cannot do is vote, and brokers commonly accept fractional orders only as market orders during regular hours rather than as limit orders.

There is one place the difference shows. Fractions live on the broker's own books rather than out in the market, so moving an account to another firm often means the fractional pieces are sold rather than transferred, because the receiving firm may not take them. That is the surprise people tend to meet later rather than at the start.