Fractional Shares
A fraction of a share is a position held by the broker on your behalf. It behaves like a share in most respects and differs in several that matter.
MadStockAlerts Research · Updated August 29, 2026
What to take away
- Fractions exist at the broker level; exchanges trade whole shares.
- They generally cannot be transferred to another firm and are liquidated instead.
- Dividends are paid pro rata, rounded to the cent.
- Voting rights on fractions are handled inconsistently and are often not passed through.
- Order types available on fractions are usually more limited than on whole shares.
MAD Academy Training Video · 0:45
A Share of a Share, Held by the Broker
Fractional shares let small amounts be invested fully, and the fraction is a broker-level record rather than something the market knows about.
This lesson is part of a Stock Alerts + Tools plan.
What a fraction actually is
Exchanges match orders in whole shares. A fractional position therefore exists in the broker's own books: the firm holds whole shares and allocates fractions of them across customer accounts, netting the fractions internally.
This is why the feature is available at some firms and not others, why the available order types are narrower, and why fractions behave differently at the boundaries. The fraction is a claim on the broker's position rather than a position at the exchange.
It also explains the execution model. A fractional order is usually filled by the broker from its own inventory at a price derived from the market rather than routed as a distinct order, which is a different arrangement from a whole-share order.
- 1You buy 0.4 shares
- 2The broker holds whole sharesAnd allocates fractions across accounts internally
- 3Nothing reaches an exchange as a fractionSo order types and hours are restricted
- 4It cannot transfer outWhich is why a transfer liquidates it
Where fractions behave differently
| Whole shares | Fractions | |
|---|---|---|
| Dividends | Paid per share | Paid pro rata, rounded to the cent |
| Splits | Applied per share | Applied, producing further fractions |
| Voting | Passed through | Frequently not, and it varies by firm |
| Transfer to another broker | Standard | Usually liquidated instead |
| Order types | Full range | Often market or limited types only |
| Trading outside regular hours | Available | Frequently not |
The fourth row is the one with a real cost. A taxable account transferring to another firm has its fractions sold, which realises a gain or loss that the account holder did not choose to realise.
What they are useful for
- Investing a fixed amount rather than a whole number of shares, which makes regular contributions exact.
- Holding a position in a very high-priced security at a size that suits the account.
- Reinvesting dividends fully, rather than leaving a residual cash balance.
- Building a diversified set of positions in a small account without the share price dictating the weights.
The last is the most substantive. Without fractions, a small account's allocation is determined by share prices rather than by any intention, and one high-priced holding can dominate simply because it comes in large units.
The tax and record-keeping consequence
Fractional positions generate many small tax lots, particularly where dividends are reinvested automatically. Each reinvestment is a purchase with its own date and basis.
This interacts with the wash sale rules. A dividend reinvestment is a purchase, so selling a position at a loss while a reinvestment occurs within the surrounding window can trigger a disallowance on part of that loss. The reinvestment is automatic and the consequence is not.
This describes how the mechanics work rather than what anyone should do about it. The interaction of automatic reinvestment, holding periods and loss rules depends on circumstances that only a tax professional can apply to a particular account.
How a fractional order is executed
Because exchanges match whole shares, a fractional order cannot be routed in the ordinary way. Brokers handle it internally, and the mechanics differ from a whole-share order in ways that show up in the fill.
- The broker typically fills the fraction from its own inventory, at a price derived from the market.
- Orders may be aggregated and executed at intervals rather than immediately.
- The available order types are usually restricted, frequently to market orders only.
- Trading outside regular hours is often unavailable for fractional quantities.
The second point is the one that surprises. A fractional order placed at a moment of rapid movement may execute at a materially different price from the one on screen, because it was not routed at that instant.
None of this makes the feature unsound. It makes it a tool suited to regular investing at a chosen amount rather than to precise execution, which is what it was built for.