We currently do not offer fractional share trading in a simulated trading account as, aside from the dollar amount invested, it's not materially different from transacting in whole shares.
Can I trade fractional shares in a paper trading account?
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What is fractional share trading?
Can I trade Fractional Shares in IBKR GlobalTrader?
Will I receive a fractional share position from a corporate action?
How do I change the Base Currency for my paper trading account?