Seven of the 10 are charged with conspiracy counts.
The six students charged this week all remain in jail on $1 million bail for each conspiracy count against them.
The result is that the jury acquitted on all but one conspiracy count.
The conspiracy count carries a maximum sentence of five years in prison and a $250,000 fine.
Each conspiracy count, he said, carries a possible five-year prison term on conviction.
Both also are charged in a single conspiracy count.
If convicted on the conspiracy count, Lewis could face 10 years to life in prison.
The conspiracy counts are each punishable by up to five years in prison and a $10,000 fine upon conviction.
He must also pay a $15,000 fine on the conspiracy count and serve two years of supervised release.
Each of the mail fraud and conspiracy counts carried possible five-year prison terms.