Stock split
By Jude Wallis
A stock split divides the same company into more shares. Share count is multiplied by the split factor and the price per share is divided by that factor, so market capitalisation is unchanged at the split instant.
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In an N-for-one split, each old share becomes N new shares and the quoted price is divided by N. Ownership percentage does not change. Per-share figures such as earnings per share are restated so a comparison across the split does not mistake new units for a collapse in the business.
A reverse split runs the arithmetic the other way.
How a stock split works is the explainer. The stock split calculator applies the two multiplications.