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.
17. Fleetwood
Number of signings: 7; Signings: Shaun Rooney (St Johnstone - free), Josh Vela (Shrewsbury - free), Jay Lynch (Rochdale - free), Josh Earl (Preston - free), Callum Morton (West Brom - undisclosed), Brendan Wiredu (Colchester - undisclosed), Promise Omochere (Colchester - undisclosed). Photo: Catherine Ivill
18. Morecambe
Number of signings: 7; Signings: Max Melbourne (Lincoln - free), Donald Love (Salford - free), Connor Ripley (Preston - free), Farrend Rawson (Mansfield - free), Ashley Hunter (Salford - free), Jake Taylor (Port Vale - undisclosed), Caleb Watts (Southampton - loan). Photo: Mike Hewitt
19. Pompey
Number of signings: 7; Signings: Marlon Pack (Cardiff - free), Zak Swanson (Arsenal - undisclosed), Joe Rafferty (Preston - free), Josh Griffiths (West Brom - loan), Joe Pigott (Ipswich - loan), Colby Bishop (Accrington - undisclosed), Josh Oluwayemi (Spurs - loan). Photo: Portsmouth FC
20. Sheffield Wednesday
Number of signings: 8; Signings: David Stockdale (Wycombe - free), Ben Heneghan (AFC Wimbledon - free), Akin Famewo (Norwich - undisclosed), Michael Smith (Rotherham - free), Michael Ihiekwe (Rotherham - free), Will Vaulks (Cardiff - free), Tyreeq Bakinson (Bristol City - undisclosed), Reece James (Blackpool - loan). Photo: Catherine Ivill