# Overview

When your first buy order is fully executed, the resulting quantity of the instrument purchased will be represented as a position that can be queried via the Investment API. As buy and sell orders, corporate actions and account transfers are placed, the quantity of your securities position may change.

* **[Learn how positions work](/products/byol/guides/positions/positions_intro)** 
A position represents the holdings of a specific instrument in a user’s account.
* **[Account valuations](/products/byol/guides/positions/valuations)** 
The account valuation is a total value of all securities on a given account. Upvest provides information on current and historic End of Day (EOD) account valuations.