Unless you received dividends from the stock you have no income. Therefore you don't have anything to report. You should keep your confirmations from whenever you buy or sell anything. You should keep all your monthly statements. You should keep the Composite Form 1099 which they sent to you a month or so ago.
While you don't need all these documents to substantiate your income tax return they are useful if for any reason something gets misplaced. I keep all my confirms in a separate file. All the statements are kept in a different file in a different file cabinet. And the 1099s are kept with my tax return file. As a result I am confident that I can find any info needed even years after the trades took place.