Scotland Under-21 striker Eamonn Brophy has signed a new contract to stay at Kilmarnock until 2021.
Brophy, 22, left Hamilton Academical to join the Rugby Park side on a three-year deal in August and has scored eight goals in 24 appearances.
Rory McKenzie, Alan Power and Greg Kiltie have all signed new Kilmarnock deals until 2020 in recent days.
Meanwhile, Killie attacker Adam Frizzell, 20, has joined Livingston on loan until the end of the season.
Kilmarnock boss Steve Clarke told BBC Scotland: "I am delighted all the boys are signing new contracts. It was important for me that we started to tie them down as early as we could.
"Fortunately all of them seemed to be happy to come to an agreement with the club."