The Congress, main opposition in the state, failed to retain the seat and came fourth while the Bharatiya Janata Party (BJP), ruling in Jharkhand, finished third.
The second spot was taken by Jharkhand Vikas Morcha-Prajatantrik (JVM-P).
AJSU candidate Navin Jaiswal managed to get 41,332 votes while JVM-P candidate Ajay Nath Sahdeo secured 29,774 votes.
BJP candidate Ramjilal Sarda got 26,186 votes while Congress candidate Sunil Sahay pulled 21,446 votes.
AJSU is an alliance partner of the BJP in Jharkhand.
The by-poll took place June 12 with around 38 percent polling.
The seat had fallen vacant after Congress legislator Gopal Nath Sahdeo died in 2010 following an illness.
Ranchi: All Jharkhand Students Union (AJSU) candidate Navin Jaiswal won the Hatia assembly by-poll by a margin of over 11,500 votes, defeating the BJP, Congress and JVM-P nominees.
First Published: Friday, June 15, 2012, 12:50