The jury didn't say he "did not commit insider trading"; they said the government didn't prove that he committed insider trading . They didn't say he's innocent of the charges, but that he's not guilty of them. There's an important difference between the two.
Except that in America people are innocent until proven guilty. In the eyes of the law, he is innocent.
Judges admonish juries that people are "innocent until proven guilty" becaues most jurors aren't sophisticated enough to make the distinction.