Junior Warriors utility Erin Clark (18) and back-rower Ofahiki Ogden (20), who have both been given time in reserve grade this season, have deals to the end of next season while prop Patrick Sipley (24), older brother of rookie NRL front-rower Toafofoa, also has a one-year deal.
Sipley was introduced to the Intrust Super Premiership side last season and has again been used by coach Stacey Jones this year.
"Sol has made fantastic progress jumping straight from the NYC into the NRL last year," explained Warriors recruitment and development manager Tony Iro.
"He has proved to be not only one of the game's most damaging centres but also one of the most consistent. The NRL coaching staff are hugely impressed with him.
"We've moved to secure him long-term and we're also delighted with the way Ken, Jazz, Bunty, Erin and Pat are developing.
"It's especially pleasing for us seeing Sol, Ken, Jazz, Bunty and Erin come through our NYC side while Pat shows there's a pathway from local football as well."
Kata, Maumalo, Tevaga and Afoa were all in the club's NYC premiership-winning side in 2014.
Kata made 34 consecutive NRL appearances following his debut before his run was broken by a one-match suspension last month.
Maumalo played eight NRL games last season, but was confined to reserve grade until earning a recall for last week's 12-10 win over the Sydney Roosters, as a replacement for the injured Manu Vatuvei.
The Papatoetoe junior will again line up on the left-wing in tomorrow's clash against competition leaders Cronulla at Southern Cross Group Stadium.
Tevaga made the first of his six NRL appearances this season in the round three defeat to Melbourne, and has earned a reputation as a rugged defender also capable of playing in the back-row.
Afoa has played more than 50 NYC games, and after making his ISP debut last season, returned to the side for last week's 38-6 loss to Newtown.
This weekend Clark again starts at loose forward for the NYC side against Cronulla, while Sipley will come off the interchange bench in Saturday's ISP clash against North Sydney at Mt Smart Stadium No2 field.
Warriors shore up young talent
Solomone Kata
Centre, 21-years-old, re-signed to end of 2019
Ken Maumalo
Wing, 21-years-old, re-signed to end of 2018
Jazz Tevaga
Hooker, 20-years-old, re-signed to end of 2018
Bunty Afoa
Prop, 19-years-old, re-signed to end of 2019
Erin Clark
Utility, 18-years-old, re-signed to end of 2017
Ofahiki Ogden
Back-rower, 20-years-old, re-signed to end of 2017
Patrick Sipley
Prop, 24-years-old, re-signed to end of 2017