Leicester Tigers have agreed new deals with five members of the club's senior squad.
Mid-season signings Ashton and Jansen have agreed deals after initially signing short-term contracts.
Dual-international Ashton has made nine appearances since his debut in February, scoring seven tries – including a hat-trick against Bristol Bears at Mattioli Woods Welford Road when he also broke the Premiership's all-time try-scoring record.
Jansen, who made his professional rugby debut when he played his first game for Tigers in the Premiership Rugby Cup, has appeared on four occasions, including a Gallagher Premiership debut away to Harlequins.
Fiji international Murimurivalu has played 36 times for Tigers since his arrival ahead of the restart phase of the 2019/20 season.
The versatile outside-back has scored seven tries, including five this season, since his debut in September 2020.
Simmons, who has spent the season on loan with Championship club Jersey Reds, has made 25 senior appearances for Tigers after graduating from the club's academy programme ahead of the 2016/17 campaign.
Capable of playing scrum-half and in the outside-backs, Simmons will return to Leicester in the summer ahead of next season.
Wigglesworth, the Premiership's record holder for most appearances with 316, will continue in his dual-role beyond the current campaign as player and coach.
The England international made his Tigers debut in the opening round of the 2020/21 season at Mattioli Woods Welford Road and has appeared on 35 occasions, scoring three tries.
Ahead of the current season, the experienced campaigner joined Steve Borthwick's coaching team to lead the club's attack alongside assistant coach Matt Smith and will continue the on-and-off field duties next season.
Speaking about the new deals, Leicester Tigers Head Coach Steve Borthwick said: “It is great to be able to agree new deals with all of these players and have them recommit to Leicester Tigers.
“They have all been a part of these early stages in this journey and I am sure our supporters are pleased to see these new deals announced.
“We have made great strides in the past 18 months but still have a lot of growth in us and a lot of hard work ahead, which each of these players is committed to.
“It is fantastic that they will continue to be a part of what we are building at Leicester Tigers.”