<prompt> Human: I have a SIMPLE IRA and Roth IRA through fidelity and have all the money in both accounts in a 2050 target fund. Is this the same as making the mistake of not diversifying investments? Or since the fund is diversified, is this okay? Thank you guys!  <response>: No. The fund itself is made up of other funds, stock and bonds. Inside those funds are thousands of companies and organizations. The last time I checked the vanguard 2055 target date fund owns shares in around 3000 companies, and thats just the stock fund. 