FPX holds positions in the 100 largest, and typically most liquid, US firms with recent IPOs. Eligible stocks are purchased after the close on the 6th trading day and sold on the 1000th, for a holding period of roughly 4 years. The fund applies further quantitative screens in addition to the usual de minimis size and liquidity requirements, but these are fairly relaxed. It is also market cap-weighted with a capping scheme of 10% for each individual security. See sibling funds FPXE and FPXI for Europe and broad international exposure, respectively, using the same methodology. Prior to December 14, 2016, the fund traded with the name First Trust US IPO Index ETF, however its name change bore no impact to FPXs investment strategy. One caveat worth noting: In the case of an index constituent merging with or being acquired by a mature company, the resulting entity will remain included in the index.