Strategy. The Fund invests under normal circumstances at least 80% of its assets (net assets plus the amount of any borrowings made for investment purposes) in the stocks in the Morningstar US Communication Services Index (Index) in proportion to their market capitalization weighting in the Index. The Index measures the performance of U.S. companies that provide communication services using fixed-line networks or those that provide wireless access and services. The Index is float market capitalization weighted. The Index is reconstituted semiannually and implemented after the close of business on the third Friday of June and December and effective the following Monday. The Index is rebalanced quarterly and implemented after the close of business on the third Friday of March, June, September, … Show more… The Fund invests under normal circumstances at least 80% of its assets (net assets plus the amount of any borrowings made for investment purposes) in the stocks in the Morningstar US Communication Services Index (Index) in proportion to their market capitalization weighting in the Index. The Index measures the performance of U.S. companies that provide communication services using fixed-line networks or those that provide wireless access and services. The Index is float market capitalization weighted. The Index is reconstituted semiannually and implemented after the close of business on the third Friday of June and December and effective the following Monday. The Index is rebalanced quarterly and implemented after the close of business on the third Friday of March, June, September, and December and effective the following Monday. As of December 31, 2024, the Index had 54 constituents and the full market capitalization range was $907.68 million to $1.28 trillion. The number of securities is not fixed and can vary from reconstitution to reconstitution. The Fund employs a passive investment approach, called indexing, which attempts to replicate the investment performance of the Index through representative sampling. Indexing may offer a cost-effective investment approach to gaining sector exposure over the long term. Indexing may eliminate the chance that a Fund will outperform the Index, but also may reduce some of the risk of active management, such as poor security selection. The Funds ability to achieve significant correlation with the performance of the Index may be affected by changes in shareholder flows, securities markets and changes in the composition of the Index. The Fund may also invest in a combination of exchange-traded funds (ETFs) and cash to maintain correlation to its index, to assist with index rebalances, and to meet redemption or purchase requests. The Funds holdings are rebalanced on a regular basis to reflect changes in the composition of the Index. The Fund may lend its securities to increase its income. The Fund may invest in financial futures, a type of derivative that may be used to obtain exposure to a variety of underlying assets, consistent with the Funds investment objective and strategies, to provide liquidity for cash flows, to hedge dividend accruals or for other purposes that facilitate meeting the Funds objective. The Funds use of financial futures is intended to assist replicating the investment performance of the Index. The Fund is non-diversified under the Investment Company Act of 1940, as amended (the 1940 Act), and may invest more of its assets in fewer issuers than diversified mutual funds. Show less