ATMP is an ETN tracking a dynamic index of US and Canadian MLPs. The fund offers a concentrated basket that can include as few as 20 firms or as many as 100. ATMP takes an alternative approach to selection, as it includes both general partnerships shares and traditional limited partnerships shares. Only companies traded on major US stock exchanges can be included in the portfolio and MLPs are also screened based on factors like long-term credit ratings and cash flows generated from midstream oil & gas activities. Additionally, the index is modified market-cap-weighted and caps limited partnerships weights at 8% and general partnerships shares at 4%. The index is reconstituted and rebalanced quarterly.