Do not mention the performance or returns of past deals. Unless all past deals are included, examples of past deals should be selected based on non-performance based criteria.
If your past deals include investments made with other people, it is important to make that clear.
If you include any historical deals, you should always include a disclosure along the following lines:
“This list is only partial and these investments are not representative of the entire portfolio. Most early-stage investments fail. A complete list of past investments is available upon request.”