Switched Idol Trainees

Chanmi (Co-Ed School)
   SM Entertainment → Core Contents Media

CL (2NE1)
   JYP Entertainment → YG Entertainment

Dongwoon (Beast)
   JYP Entertainment → Cube Entertainment

Doojoon (Beast)
   JYP Entertainment → Cube Entertainment

Eddie
JYP Entertainment → Cube Entertainment

Eunkyo (Co-Ed School; 5Dolls)
JYP Entertainment → Core Contents Media

G-Dragon (Big Bang)
   SM Entertainment → YG Entertainment

G.NA
   Good Entertainment → Cube Entertainment

Gayoon (4Mintute)
JYP Entertainment → Cube Entertainment

Hyomin (T-ARA)
JYP Entertainment → Core Contents Media

Hyori [Lee Hyori]
SM Entertainment → DSP Entertainment

Hyorin (SISTAR)
   JYP Entertainment → Starship Entertainment

Hyosung (Secret)
   Good Entertainment →  TS Entertainment

Hyuna (4Minute)
   JYP Entertainment → Cube Entertainment

Hyunseung (Beast)
   YG Entertainment → Cube Entertainment

Jaehyo (Block B)
   Cube Entertainment → Brand New Stardom

Jaekyung (Rainbow)
JYP Entertainment → DSP Entertainment

Ji Eun (Secret)
JYP Entertainment → TS Entertanment

Jihyun (4Minute)
   JYP Entertainment → Cube Entertainment

Jiyoon (4Mintute)
JYP Entertainment → Cube Entertainment

Junhyung (B2st)
   Xing Entertainment → Cube Entertainment

Junsu (2PM)
   YG Entertainment → JYP Entertainment

JYJ (Jaejoong, Yoochun, Junsu)
   SM Entertainment → CJes Entertainment

Kahi (After School)
   SM Entertainment → Pledis Entertainment

Kevin (U-KISS)
   Xing Entertainment → NH Media

Kibum (U-KISS)
   Xing Entertainment → NH Media

Kwangmin (Boyfriend)
   JYP Entertainment → Starship Entertainment

Minwoo (ZE:A)
JYP Entertainment  →  Star Empire Entertainment

Nam Gyuri (SeeYa; Actress)
JYP Entertainment → Core Contents Media

Raina (After School)
JYP Entertainment → Pledis Entertainment

Sohyun (4Mintute)
JYP Entertainment → Cube Entertainment

Son Anna
SM Entertainment → Nine Media Group

Soohyun (U-KISS)
   Good Entertainment → JYP Entertainment → NH Media

Soyeon (T-ARA)
   SM Entertainment → Core Contents Media

Sunwoong (Touch)
   JYP Entertianment → YYJ Entertainment

Thunder (MBLAQ)
   LOEN Entertainment → J.Tune Camp

UEE (After School)
   Good Entertainment → Pledis Entertainment

Viki (Dal Shabet)
   Star Empire → Happy Face Entertainment

Yoobin (Wonder Girls)
   Good Entertainment → JYP Entertainment

Yoseob (B2ST)
   Good Entertainment → JYP Entertainment → M Boat Entertainment →  Cube Entertainment

Young Ji 
JYP Entertainment → Cube Entertainment

Youngmin (Boyfriend)
   JYP Entertainment → Starship Entertainment

Youngsaeng (SS501)
   SM Entertainment → DSP Entertainment

Youngsky (One Way)
   JYP Entertainment → Yejeon Media

Zico (Block B)
   SM Entertainment → Brand New Stardom

Credit: kpoplists.tumblr.com