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.
9. Glentoran - Pat Hoban
Glentoran scored the fewest home goals of any Premiership team last season and signing Pat Hoban is a good way to rectify an issue which Declan Devine has openly spoken about - goals. Having netted over 200 times throughout his career and topped the League of Ireland Premier Division's charts four times, including last season at Derry City, Hoban is a proven performer and could take the Glens to another level if he can hit the ground running. Photo: Glentoran FC
10. Larne - Dan Bent
Gibraltar international Dan Bent has already made a big impact at Larne, scoring in their Conference League second qualifying round victory over Prishtina and has played every minute of their European journey so far. The 29-year-old has played under manager Nathan Rooney before so is used to his system and demands. Bent will add energy to Larne's midfield and could be a driving force behind potential success. Photo: Pacemaker Press
11. Linfield - Sean Brown
Linfield have been the quietest team in the transfer market, making only one signing so far with the addition of Sean Brown from Larne. The Northern Ireland youth international is an exciting talent and impressed on loan at both Bangor and Ballymena United during loan spells. He made his Blues debut as a late substitute in last week's win over Zalgiris. Photo: Linfield FC
12. Portadown - Rayhaan Tulloch
Former England youth international Rayhaan Tulloch won the League of Ireland Premier Division title with Shelbourne last season, making 10 appearances and scoring twice for Damien Duff's side. Having also spent time on the books of West Brom and Shrewsbury, Tulloch could prove to be an impressive piece of business conducted by Niall Currie as the Ports look to build on last season's solid Premiership return. Photo: Portadown FC