Excellent write-up! Is there somewhere where I can read up on all the trading jargon?
Also I wonder how can there be changes in the price of a stock after market if the exchange has closed? Isn’t the whole point that trades need to happen for stocks to get a certain value?
There's after market trading on venues. But because most of the liquidity has "gone home" you can't transact as much at those prices and those prices are based on relatively few/small transactions.
Yeah, this is where a system like this shines. In that you can build a tool, like top, but for the stock market. You have all the real-time data. So, you can look at where the party is happening at. Just by looking at the trade flows. This is where building your own system absolutely kills anything else.
https://www.investopedia.com/ is probably the best resource and chatgpt. I honestly, just google stock related terms and all roads lead to investopedia.
Also I wonder how can there be changes in the price of a stock after market if the exchange has closed? Isn’t the whole point that trades need to happen for stocks to get a certain value?