| May 31
|
 KT A
|
MakNooN, Lila, Climax and Sharkbari join KT Rolster A while Vitamin, Hiro and Me5 leave. KaKAO moves to KT Rolster B
|
| May 30
|
| EUWCS
|
 Heimerdingers Colossi  Dongsquad in EUW Challenger Series Week 6 Cup
|
| May 29
|
 NJ SWD
|
MaKNooN leaves NaJin Sword.
|
| May 28
|
| EMS
|
Anexis eSports MeetYourMakers  GamingGear.eu in EMS Spring 2013 Nordic & East
|
 RYL
|
Tabe rejoins Royal Club Huang Zu.
|
| May 26
|
| Riot
|
Korea Champions China LPL  Garena Team North America LCS in All-Star Shanghai 2013
|
 CLG
|
Nientonsoh joins Counter Logic Gaming as new starting Top lane, Chauster moves to Support, bigfatlp moves to starting Jungle, HotshotGG moves to substitute/Coaching role, and Aphromoo leaves.
|
| May 25
|
 Anexis
|
eRot1c leaves Anexis eSports.
|
| May 23
|
| TeSL
|
TeSL Teams make mid-season adjustments.
Yaumo is released from Gamania Bears.
Kukuku & ulRD are released from Wayi Spider.
Clurinus is released from yoe IRONMEN.
president & CatLatte are released from e-Sports Dragons Pro.
|
| EUWCS
|
Heimerdingers Colossi peculiar gaming in EUW Challenger Series Week 5 Cup
|
 C9
|
Previous Quantic Gaming roster of Balls, Meteos, Hai, SnEaKyCaStRoO, and LemonNation leave the organization and reforms Cloud 9.
|
| May 22
|
 NiP
|
Ninjas in Pyjamas acquires the previous roster of Copenhagen Wolves.
Bjergsen, Deficio, TheTess, Svenskeren and GodBro join.
|
| May 21
|
 EP
|
MagicWindom leaves Energy Pacemaker.
|
| May 19
|
 Spider
|
Wayi Spider China disbands.
BSYY, Easy, Leaf, Jun, Leon and Fan are released.
|
| NGF
|
Team WE Royal Club Huang Zu Taipei Assassins in NVIDIA Game Festival 2013
|
| May 18
|
 d UK
|
Team Dignitas aquires the roster of British Tea Time.
NitriX, Impaler, CookMySock, SmokeyLemon and Yerrow join.
|
| May 15
|
| Riot
|
Patch v3.07 is released.
|
| May 14
|
 TCM
|
Brokenshard joins TCM-Gaming.
|
| May 13
|
 DB
|
YamatoCannon and Malunoo leave DragonBorns.
|
| May 12
|
| LCS
|
Quantic Gaming, Velocity eSports, Team Dignitas, and Counter Logic Gaming qualify for the Season 3 North American Summer Season
|
| May 11
|
 MRN
|
Team MRN disbands. Megazero, ClakeyD, ecco, Nientonsoh, Heartbeat, AtomicN and Cruzerthebruzer are released.
|
| May 10
|
 coL Acad
|
compLexity acquire the roster of Armata Gaming as an Academy team. Sarasun, Veelox, Dragonrouge, Doomtrobo, and Zhanos join.
|
| May 9
|
 CW
|
Previous Copenhagen Wolves roster departs from the organisation. TheTess, Bjergsen, Godbro, Svenskeren, Deficio, and cowTard leave.
|
| May 6
|
| LCS
|
MeetYourMakers, Team ALTERNATE, Sinners Never Sleep, and Copenhagen Wolves qualify for the Season 3 European Summer Season
|
| May 5
|
 ahq.KR
|
ahq e-Sports Club releases the roster of their Korean squad.
|
| May 2
|
 mouz
|
mousesports acquires the roster of Dexter is actually evil. Kikis, dexter1, Moopz, foo sharp, and AoD join.
|
| May 1
|
| DB
|
Brokenshard and Spontexx leave DragonBorns.
|
