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As a knowledgeable professor of finance, it is crucial to understand the concept of security holdings. These are essentially the securities that have been bought or sold by an investor and are still held within their portfolio until the previous trading day, also known as T-1. It is important to note that these holdings are specifically for the delivery product, indicating a longer-term investment strategy. Therefore, as investors, it is vital to keep track of our security holdings to make informed investment decisions.