It depends. If your brokerage was able to transfer the actual securities (stocks, bonds, mutual funds, EFT's, etc.) to the new broker, you likely did not have a sale.
The more frequent scenario is that some or all of the securities in the old brokerage account would be sold and cash transferred to the new brokerage. In that case, it is likely that you have one or more sales to report.
Brokers are required to send you a FORM 1099B. That will give you the information you need. If you did not receive a 1099B, you should log into your account with the broker and look for a copy of your 1099B or call your broker for the information.
