Taxes

What is a IRS Reportable Transaction and a Non-Reportable Transaction in Stock Trading?

It appears like, I need to fill in the Tax Form 1099 to file my income from Trading Stocks. I have an account with Scottrade which says, I will have the Form 1099 generated if I have IRS Reportable Transactions in my Account. So I was just wondering what are these IRS Reportable Transations and Non Reportable Transactions.
And here is what I gathered from different sources:
 Following transactions are considered as IRS Reportable transactions: