OFOS seeks to mirror the performance of an index primarily including companies within the offshore oil services ecosystem, focusing on production, exploration, development, transportation and distribution. The fund employs a market cap-weighted methodology, categorizing eligible enterprises into segments based on their revenue. These are named pure play, pre-revenue and diversified organizations. OFOS sets limits for individual securities within each category to manage risk and ensure portfolio diversification. Investments may also include MLPs, capped at 25%. The fund is globally diversified, excluding China and Russia, and adheres to composition and market-cap requirements for index inclusion and continued presence. Reconstitution and rebalancing occur semi-annually, with the flexibility to make adjustment due to significant corporate actions. OFOS maintains the ability to allocate a portion of its assets to investments outside of the Index if deemed beneficial for performance tracking.