OILD is an exchange-traded note that aims to deliver three times the inverse of the daily performance of an index composed of U.S. oil and gas companies. This geared product focuses on a concentrated selection of firms engaged in integrated exploration and production, upstream energy, and downstream/midstream operations, explicitly excluding Master Limited Partnerships (MLPs). The underlying index selects its top 25 constituents based on market capitalization, then applies a weighting methodology using their average daily trading value over one-month and six-month periods. Sector-wise, the index allocates 30% to oil and gas exploration and production, 50% to upstream, and 20% to downstream and midstream segments. Due to its leveraged design, OILD is exclusively suited for short-term trading strategies; long-term investors may experience returns that significantly deviate from the inverse index performance because of daily compounding. Furthermore, its ETN structure means investors are subject to the credit risk of the issuing institution.