Marlon Pack became Pompey’s first acquisition of the summer, returning on a free deal from Cardiff.
The 31-year-old was soon followed by the arrivals of Zak Swanson, Joe Rafferty, Josh Griffiths, Joe Pigott and Josh Oluwayemi before Colby Bishop became the latest name to join the ranks after joining for an undisclosed fee from Accrington.
In total, seven fresh faces have arrived through the door at Fratton Park, while Marcus Harness remains the only name to depart.
But how does the Blues’ summer transfer business compare to their League One rivals?
We’ve taken a look at the most – and least – active clubs in the third tier so far this window.
Here’s what we discovered.
21. Forest Green
Number of signings: 9; Signings: Amani Little (Torquay - free), David Davis (Shrewsbury - free), Kyle McAllister (St Mirren - free), Alfie Burnett (Rotherham - free), Reece Brown (Huddersfield - free), Jacob Jones (Swansea - free), Corey O’Keeffe (Rochdale - undisclosed), Oliver Casey (Blackpool - loan), Harry Boyes (Sheffield United - loan). Photo: Jan Kruger
22. Derby
Number of signings: 11; Signings: Conor Hourihane (Aston Villa - free), Nathaniel Mendez-Laing (Sheff Wednesday - free), Joe Wildersmith (Sheffield Wednesday - free), Tom Barkhuizen (Preston - free), Korey Smith (Swansea - free), David McGoldrick (Sheffield United - free), James Chester (Stoke - free), James Collins (Cardiff - free), Scott Loach (Chesterfield - free), Kwako Oduroh (Manchester City - free), Haydon Roberts (Brighton - loan). Photo: Morgan Harlow
23. MK Dons
Number of signings: 12; Signings: Jack Tucker (Gillingham - undisclosed), Ethan Robson (Blackpool - free), Matt Dennis (Norwich - undisclosed), Jamie Cumming (Chelsea - loan), Darragh Burns (St Patricks - undisclosed), Dawson Devoy (Bohemians - free), Will Grigg (Sunderland - free), Bradley Johnson (Blackburn - free), Nathan Holland (West Ham - free), Conor Grant (Rochdale - undisclosed), Louie Barry (Aston Villa - loan), Henry Lawrence (Chelsea - loan). Photo: Shaun Botterill