What Are Fractional Shares?

If a stock costs $400, a classic order won't let you own a piece of the company for $50. Fractional shares remove that barrier: you enter a dollar amount instead of a share count and get part of a share in return. The mechanism is simple, but it doesn't always carry every right a whole share does.

How It Works

The smallest unit on an exchange is a whole share. The broker pools the requests of clients placing fractional orders, buys whole shares in the market or fills them from its own inventory, and allocates the pieces to client accounts on its books.

That has two consequences. First, your fraction has no existence outside the broker: at the central depository the whole share sits in the broker's name, and your piece is the broker's internal record. Second, how and when the order executes depends on the broker: some fill immediately, some in batches during the day, and some allow only market orders for fractions.

What's Missing Compared With a Whole Share

What It's For

A fractional share isn't a return tool; it's a measuring tool. It makes a difference in three jobs:

• Small regular purchases. For someone investing a fixed amount each month, the indivisibility of the share price disappears; the whole amount goes into the investment and no leftover cash sits on the side. More: Dollar-Cost Averaging
• Weighting precision. If you want to build a portfolio in percentages, the whole-share requirement on an expensive stock throws off the target weights. More: Risk Management
• Reinvesting dividends. Small dividend amounts can be put back into the same stock as fractions.

The link to stock splits reads from here too: companies split expensive shares to make them accessible to small investors. As fractional trading spread, that reason weakened, but split decisions are still being made. More: What Is a Stock?

Where You'll See It on This Site

Prices on stock pages are always the price of a whole share. Your fractional position is worth that price times your fraction; keep that in mind when comparing with the amount shown in your broker's app.