The chairman of Enron Ken Lay died in 2006 but had been convicted and would be in prison were he alive. The CFO Andrew Fastow was convicted and served five years in prison 2006-2011. He collaborated with the prosecution and so received a lighter sentence. His wife serve six months. The COO Jeffrey Skilling is serving a sentence of 24 years in Federal prison and will be released in 2028 when he is 74 years old. Both men also paid multi million dollar fines.
Wall Street executives were instrumental in setting up the offshore entities that Enron used to hide losses. This made the Enron balance sheet look more robust than it actually was and helped to boost the stock price. These Wall Street executives collaborated with the Enron executives in promoting their stock and their offshore entities and earned large sums for doing so. They would also have profited enormously by shorting the stock when Enron fell apart and they would have had a unique position to know when to do this. None of them were ever sent to prison for the role they played. Had they gone to prison then it would have put a chill on the practices they were pursuing and that continue to be used to this day.
"Jesus answered them: 'Truly, truly, I say to you, everyone who commits sin is a slave to sin. The slave does not remain in the house forever; the son remains forever. So if the Son sets you free, you will be free indeed.'" (John 8:34-36)