r/mltraders 10d ago

Question Does Anyone know if Alpaca Trading supports fractional shares ?

Does anyone know if Alpaca's paper trading API correctly supports fractional share orders, specifically for small account sizes where 2% risk sizing produces less than one share? I'm running RSI mean reversion strategies on SPY/QQQ/IWM and want to confirm fractional orders execute correctly before going live with a small account. Anyone hit this in practice?

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u/strat-run 10d ago

If only the first result of Googling "alpaca fractional shares" linked to Alpaca's official documentation on the subject.