What do Safety, St Francis & my builder have in common?

You receive a panic phone call from your broker sometime in 1987 advising you to sell all your shares in Alcoa. In less than one year later, you discover that you missed out on a record profit (and counting).  What actually happened is...

What am I? Check!

This post has the answer to a riddle I posted earlier under "Riddle me this: What am I?" – check it out before you read on...