# Historical Market Cap The Historical Market Cap dataset provides a clean, point-in-time view of equity size over time. It tracks historical shares outstanding by ticker and date, allowing users to reconstruct market capitalization using information available at each moment in time. The dataset is designed to support **survivorship-safe** research, universe construction, and market cap–based analysis without forward-looking bias. Use the sections below to learn: * what the dataset represents and how it’s constructed * how to discover available tickers and valid date ranges * how to query historical market cap data correctly * the structure and meaning of each field * how and when the data is updated --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.alphanume.com/documentation/datasets/historical-market-cap.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.