The squads are complete for the women's 100-ball competition, with 11 new players added ahead of the August 11 start
Davina Perrin is set to make history as the youngest Hundred player after being signed by Birmingham Phoenix for the women's competition.
The 15-year-old is a member of the ACE Programme, the Ebony Rainford-Brent-inspired scheme that aims to engage and increase opportunities for black cricketers.
Right-hander batter Perrin, who represents Central Sparks, is looking forward to being among an all-star Phoenix squad.
"It’s a dream come true to have signed for Birmingham Phoenix this summer," he said.
"To have the opportunity to train and potentially play alongside the likes of Ellyse Perry, Sophie Devine and Amy Jones is amazing and I can’t wait to get going."
All eight women's squads are now complete after all remaining berths were filled ahead of the second edition of the tournament, starting on August 11.
Oval Invincibles are without Tash Farrant due to injury (Harry Trump/Getty Images)
Defending champions Oval Invincibles have added South East Stars' medium-pacer Ryana MacDonald-Gay and batter Kirstie White, who has signed up as a replacement for the injured Tash Farrant.
Natasha Wraith and Nancy Harman have joined London Spirit from Welsh Fire and Trent Rockets respectively while Lightning's Grace Ballinger has completed their roster.
Left-armer seamer Mahika Gaur, who last month took 5 for 2 as United Arab Emirates bowled out Nepal for just eight, has moved to Manchester Originals.
Northern Superchargers can boast the arrival of Bethany Harmer and Rachel Slater, while Ella Claridge and Emma Marlow have moved to Trent Rockets.
Having already completed their squads, there were no new arrivals for Southern Brave or Welsh Fire.
Natasha Wraith has swapped south Wales for Lord's (Harry Trump/Getty Images)
Hundred managing director Sanjay Patel said: "Today is a really exciting moment as we confirm the squads for the second year of The Hundred.
"We’ve got some exciting youngsters joining the women’s competition with the likes of Davina Perrin and Mahika Gaur being signed up."
Birmingham Phoenix: Davina Perrin
London Spirit: Natasha Wraith, Nancy Harman, Grace Ballinger
Manchester Originals: Mahika Gaur
Northern Superchargers: Bethany Harmer, Rachel Slater
Oval Invincibles: Ryana MacDonald-Gay, Kirstie White
Trent Rockets: Ella Claridge, Emma Marlow