Every club has looked to strengthen and with increased investment into the Irish League in recent times, many have conducted high-profile business as they look to fight in what looks to be an even more competitive top-flight.
Here, we run through the best signing made by each team during the window so far, going in alphabetical order.
5. Coleraine - Joel Cooper
It's hard to look beyond the reigning Premiership Player of the Year! A signing which could turn Coleraine into immediate title contenders, Cooper shone as Linfield won the Gibson Cup las term, scoring 19 goals and providing nine assists. Probably the Irish League's top talent, former Oxford United ace Cooper has the potential to win games single-handedly and may fire the Bannsiders to silverware success. Photo: Pacemaker Press
6. Crusaders - Adam Brooks
Many of Crusaders' summer signings are unknown quantities having never featured in the Irish League before, but 21-year-old Scottish striker Adam Brooks seems very exciting. The former Celtic youngster scored 10 goals in 23 League One appearances for Queen of the South last term and there'll be hopes that he can replicate the success of Kieran Offord at Seaview. Brooks is playing in a youthful Crues side and Finley Thorndike could also prove to be a shrewd piece of business. Photo: Crusaders FC
7. Dungannon Swifts - Sean McAllister
Sean McAllister came through the ranks at Dungannon Swifts before earning a dream move to Premier League outfit Everton, and now back at Stangmore Park, he could help Rodney McAree's men build on last season's success. McAllister was a consistent performer for Everton's U21s and also impressed during a loan spell in Scotland with Inverness Caledonian Thistle. The 22-year-old is one to watch and may prove to be a level above the Irish League. Photo: Arthur Allison/Pacemaker Press
8. Glenavon - Stephen Mallon
There were many contenders for Glenavon's top signing given their impressive transfer window, but Stephen Mallon could provide a point of difference for the Lurgan Blues. Described by assistant manager Colin Coates "as good as anybody" he has watched in the Irish League, it's worth taking Mallon's Mourneview Park potential seriously. If the former Cliftonville star can stay fit, he's going to become a fan favourite. Photo: Jonathan Porter/Press Eye