Level 1 is the real-time bid/ask quotes for securities trading on the exchange.
If you plan on calling yourself a day trader, you must interpret supply and demand forces present in the market. To help decipher the market action, TradingSim provides Level 1 data.
The buy and sell orders displayed in Level 1 are all of the orders as they occurred in real-time for a given market day. For some stocks, this represents over a million data points on a daily basis! Not only do we display this data, but it is also the engine behind our order execution process. So, if you plan on coming in and placing fake orders and watching them execute, please think again.
This is the price at which buyers are willing to execute an order.
The bid size refers to the number of shares buyers are willing to purchase.
This is the price at which sellers are willing to execute an order.
The ask size refers to the number of shares sellers are willing to sell.