Blue-chip companies are industry-leading stocks that are very established and have a strong reputation. They offer investors peace of mind, knowing that their portfolio is backed by stocks highly likely to provide consistent returns and long-term growth.The Dow is a solid gauge of the state of blue-chip companies as a whole. It comprises 30 companies and has returned about 15% in the past year.Below, I have chosen a number of the best blue-chip stocks that investors should consider adding to their portfolio ...