One of the most investor-friendly innovations in the US stock market is fractional investing, which allows investors to buy a portion of a share instead of an entire share.
For example, if Apple is trading at $200 per share and you invest $50, you own 0.25 shares. This enables investors to start with small amounts and build diversified portfolios without needing large capital.
How does exchanges manage Fractional Trading?
The NYSE and Nasdaq DO NOT trade fractional shares. Exchanges continue to execute trades in whole shares only. Fractional investing is not an exchange feature but a a Brokerage Feature.
How Does It Actually Work?
Imagine four customers place the following orders:
Customer
Investment
A
$50
B
$100
C
$30
D
$20
Total investment = $200
If Apple is trading at $200 per share, the broker purchases one whole share from the market.
Internally, the broker records ownership as:
Customer A → 0.25 shares
Customer B → 0.50 shares
Customer C → 0.15 shares
Customer D → 0.10 shares
The customers don’t own separate certificates representing these fractions. Instead, the broker maintains an internal ledger that records each investor’s proportional ownership while holding the whole shares through its custodian.
Does Every Broker Offer Fractional Investing?
No. Since fractional investing relies on the broker’s internal systems, availability varies across firms. Some brokers support fractional trading for nearly all listed U.S. stocks and ETFs, while others restrict it to selected securities or do not offer the feature at all. This explains why two investors using different brokers may have different access to fractional investing, even though they are investing in the same stock.
Fractional investing has significantly lowered the barrier to investing by allowing people to invest based on how much money they have, rather than how many shares they can afford. It’s a simple innovation that has made the U.S. stock market more accessible to millions of retail investors.
@amish Yes, the broker may buy in his own books and take the remaining share / give from his own inventory which he already owns. The US market is highly liquid with thousands of fractional buy and sell orders flowing in every second. These small orders are continuously aggregated, often adding up to one or more whole shares that the broker can buy or sell in the market.
Even if there is a temporary mismatch (for any reason) the broker can choose to hold the remaining portion on its own books by purchasing whole shares and acting as the shareholder until future customer orders utilize the remaining fractions.
This inventory management is one of the ways brokers make fractional investing seamless for customers. infact large US brokers like Fidelity, Robinhood, Charles Schwab, etc. advertise unit dollar investing and hence are incentivized to fulfill these orders without even waiting for matching customer demand.
Fractional investing is one of the biggest advantages for retail investors because it shifts the focus from the share price to portfolio allocation.
One feature that would make it even better is an AI-powered portfolio allocator. For example, instead of manually deciding what fraction to buy, a user could simply enter:
“I want to invest $200 every month with moderate risk and exposure to AI, healthcare, and the S&P 500.”
The app could then suggest an allocation using fractional shares and ETFs, while still requiring the user to review and approve the basket before execution.
Another useful addition would be showing the exact percentage ownership of each stock and the portfolio’s allocation by sector, geography, and currency. That would help investors focus on diversification rather than just the number of shares they own.
Great initiative by the Dhan team—fractional investing makes global investing much more accessible.