Who are the Philippines senators up for reelection in 2013?

Who are the Philippines senators up for reelection in 2013?
Muchi Ramirez Answered First
The following senators who are up for re-election in 2013 are Alan Peter Cayetano, Chiz Escudero, Gringo Honasan, Loren Legarda, Koko Pimentel, and Antonio Trillanes IV.