PXS is composed of large-cap stocks selected, weighted and ranked by fundamental value. The index calculates this fundamental value at company level, rather than at stock level, using four metrics: book value, cash flow, sales and dividends. While not a classic value fund, PXS breaks the link between the price of a stock and its weight in the portfolio, aiming to hold stocks in proportion to firm size, without overweighting the priciest stocks. With about 1,000 holdings and an alternative weighting, the fund dips into midcap territory. The index is rebalanced and reconstituted on an annual basis.