Net investment income per share is a financial ratio that is used to measure the profitability of an investment. It is calculated by subtracting all expenses from investment income, and dividing the result by the total number of shares outstanding. There are various synonyms for the term net investment income per share. This includes net realized earnings per share, income per share from investments, and dividend income per share. The use of these synonyms helps investors to better understand the financial performance of a particular investment. Understanding financial ratios can help investors make informed decisions about investing in a particular company or fund.