The cash flow growth rate for a stock is a measure of how the stock�s cash flow per share (CFPS) has grown over the last three to five years. Cash flow growth is one of the five growth factors used to calculate the Morningstar Style Box. For portfolios, this data point is the share-weighted collective cash flow growth for all stocks in the current portfolio. (The share-weighted average is more accurate than an asset-weighted average for this type of calculation.)