Accumulation The act of buying more shares of a security without causing the price to increase significantly. After a decline, a stock may start to base and trade sideways for an extended period. While this base builds, well-informed traders and investors may seek to establish or increase existing long positions. In that case, the stock is said to have come under accumulation.
Accumulation Distribution Line A momentum indicator that relates price changes with volume. It relates the closing price to the range of prices (H - L). The closer the close is to the high, the more volume is added to the cumulative total.