Core Insights - The Dow divisor is a dynamic constant used to calculate the value of the Dow Jones Industrial Average (DJIA), which has been adjusted multiple times to account for changes in the index's composition and artificial price movements of its component stocks [1][4][6]. Calculation and Functionality - Originally, the DJIA was calculated by summing the stock prices of 12 companies and dividing by 12, but now it includes 30 stocks and uses the Dow divisor for calculation [2][7]. - The formula for calculating the DJIA is DJIA = ∑p / d, where ∑ represents the sum of component stock prices, p represents the prices, and d represents the Dow divisor [8]. Adjustments to the Dow Divisor - The Dow divisor is adjusted to maintain the index's stability during artificial price changes caused by events such as stock splits, mergers, acquisitions, and special dividends [5][12][21]. - When a stock experiences a price change due to a stock split, the divisor is lowered; conversely, it is increased during a reverse stock split [17][19]. - The divisor is also adjusted when a component stock is added or removed from the index, depending on the price of the new stock compared to the one it replaces [13][14]. Current Status - The current Dow divisor is 0.16242563904928, indicating that a one-dollar change in a component stock's price results in a 6.156663 point change in the DJIA [22]. - The last adjustment to the Dow divisor occurred on October 30, 2025, although the specific event prompting this change is not detailed [23].