When can I trade with fractions, and when do I need at least 1 whole share?

Fractional Trading with Webull allows you to trade in very small fractions of a share. However, to maintain market quality and fairness, there are special rules:

Market Orders & Marketable Limit Orders (price can match immediately)

→ No minimum. Even tiny fractions (e.g. 0.00001 share) are allowed, because they execute right away and do not clutter the market.

Non-Marketable Limit Orders (price cannot match immediately and will sit in the order book)

→ Must be at least 1 whole share.