Reinvesting Atlas Copco dividend

Atlas Copco (ATCO-B.ST) paid out it's dividend today, 31st October. When I reinvest the dividends I receive I try to reinvest as much as possible of the total amount in the same stock. I received SEK 393.75 in dividend, however Atlas Copco is trading at SEK 300, so the difference will be reinvested at a later stage and not necessarily in Atlas Copco.

Stocks owned: 125
Dividend per stock: SEK 3.15
Dividend received: SEK 393.75
Reinvested number of stocks: 1 (SEK 300.00 x 1 = SEK 300.00)

Stocks owned after reinvesting: 126
Effect on yearly dividend: SEK +6.30