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moomooサポート : Fractional share purchases of Japanese stocks are scheduled to be handled at the end of this month. Currently, it is only possible to sell.
Here are a few ways to order.
■When proceeding to trade from the stock information screen
You can trade by searching for stocks from the app search mark > tapping “Trade” at the bottom of the stock information screen.
■When proceeding to a transaction from the account screen
1. Tap Account > More > Transactions.
2. Enter the ticker or product name, price, and quantity.
3. Enter your 6-digit transaction password to unlock the transaction.
4. Tap “Buy” or “Sell.”

There are two methods for in-kind purchases of US stocks at our company.
1. Perform transactions in yen without exchanging money (setting for multi-currency purchases (including yen): on)
Multi-currency purchase (including yen) setting: If turned on, you can trade US stocks in yen without prior exchange.
If there are deposits in both US dollars and yen, foreign currency will be used preferentially, and the shortfall will be covered in yen.
The number of US stocks that can be purchased is calculated using the provisional exchange rate at the time of order placement, and the exchange is carried out at our company after 10:00 the next morning. (The customer cannot cancel the exchange.)
Note that if you turn off the multi-currency purchase setting (including yen), it will be applied on the next transaction day.
For information on setting up multi-currency purchases (including yen), see the help below.
What are the settings for “multi-currency purchases (including yen)” - moomoo help center

2. Exchange yen to US dollars in advance, and then trade in US dollars
You can trade US stocks in US dollars after exchanging yen to US dollars yourself beforehand.
Please refer to the help page below for exchange information.
How to operate exchange orders - moomoo Help Center