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.
13. Lincoln
Number of signings: 6; Signings: Daniel Mandroiu (Shamrock - undisclosed), Paudie O’Connor (Bradford - free), Charles Vernam (Bradford - free), Jay Benn (Halifax - undisclosed), Tashan Oakley-Boothe (Stoke - loan), Carl Rushworth (Brighton - loan). Photo: Pete Norton
14. Charlton
Number of signings: 6; Signings: Jack Payne (Swindon - free), Joe Wollacot (Swindon - free), Mandela Egbo (Swindon - free), Connor McGrandles (Lincoln - free), Eoghan O’Connell (Rochdale - free), Steven Sessegnon (Fulham - loan). Photo: Pete Norton
15. Barnsley
Number of signings: 6; Signings: James Norwood (Ipswich - free), Connor McCarthy (St Mirren - free), Robbie Cundy (Bristol City - free), Nicky Cadden (Forest Green - free), Jamie Searle (Swansea - free), Luca Connell (Celtic - free). Photo: Lewis Storey
16. Shrewsbury
Number of signings: 6; Signings: Chey Dunkley (Sheffield Wednesday - free), Aiden O’Brien (Pompey - free), Tom Bayliss (Preston - free), Jordan Shipley (Coventry - undisclosed), Taylor Moore (Bristol City - loan), Julien Da Costa (Coventry - loan). Photo: Lewis Storey