County ins and outs:
Ins: Ravi Rampaul (Surrey)
Outs: Tom Wood, Greg Cork (both released)
Ins: Will Smith (Hampshire), Nathan Rimmington (Overseas)
Outs: Paul Coughlin (Nottinghamshire), Graham Onions, Keaton Jennings (both Lancashire)
Other news: Paul Collingwood has signed a one year contract extention
Ins: Feroze Khush (Youth), Matt Coles (Kent)
Outs: Chris Silverwood (Head Coach has been appointed England fast bowling coach), Kishan Vilani (released)
Winter news: Anthony McGrath has been confirmed as Head Coach.
Ins: Matt Maynard has re-joined as batting consultant. Shaun Marsh has signed a two year deal.
Outs: Jaques Rudolph (Retired), Will Bragg (Retired)
Other news: Colin Ingram has become limited-overs captain, with Michael Hogan continuing to lead the Specasavers County Championship side.
Ins: Ryan Higgins (Middlesex)
Outs: Patrick Grieshaber and Brandon Gilmour (released)
Outs: Will Smith (Durham), Michael Carberry (Leicestershire)
Ins: Ollie Robinson (Youth)
Outs: Adam Ball, Hugh Bernard, Charlie Hartley (all released) Matt Coles (Essex)
Ins: Keaton Jennings and Graham Onions (both Durham), Josh Bohannon (Youth), Liam Hurt, James Faulkner (T20 Blast)
Outs: Kyle Jarvis (released), Luke Proctor (Northamptonshire)
Contract news: Shivnarine Chanderpaul has signed a new one year contract for 2018
Captaincy news: Liam Livingstone has been named the new Club Captain
Ins: Michael Carberry (Northamptonshire), Ateeq Javid (Warwickshire)
Outs: Clint McKay (released)
Coaching staff: Paul Nixon has replaced Pierre de Bruyn with John Sadler as his assistant. Graeme Welch has left to rejoin Warwickshire.
Outs: Ryan Higgins (Gloucestershire)
Ins: Brett Hutton Nottinghamshire), Luke Proctor (Lancashire),
Outs: David Murphy (retired), Azaharulah (released)
Coaching staff: Former captain David Sales has become full-time batting coach after a part-time spell in the role.
Ins: Paul Coughlin (Durham), Chris Nash (Sussex)
Outs: Brett Hutton (Northamptonshire), Chris Read (retired)
News: Steven Mullaney has been appointed as Club Captain
Ins: Finn Trenouth
Outs: Jim Allenby, Ryan Davies, Michael Leask (all released)
Coaching staff: Andy Hurry has returned as Director of Cricket following the departure of Matthew Maynard. Jason Kerr has become head coach.
Other news: Marcus Trescothick has signed a one-year contract extention.
Ins: Mitchell Marsh, Aaron Finch (T20 Blast), Will Jacks, Gus Atkinson (both youth)
Outs: Ravi Rampaul (Derbyshire), Kumar Sangakkara (retired)
Ins: Jason Gillespie has signed as coach
Outs: Chris Nash (Nottinghamshire), Steve Magoffin (Worcestershire)
Coaching Staff: Mark Davies has left his post as head coach
Ins: Alex Thomson
Outs: Ateeq Javid (Leicestershire), Mark Adair
Coaching Staff: Graeme Welch has returned as bowling coach
Captaincy: Jeetan Patel has been named as Captain in the Specsavers County Championship and Royal London One-Day Cup, Dom Sibley will be Vice Captain. Grant Elliott will continue as Birmingham Bears captain in the T20 Blast
Ins: Alex Milton (Youth), Steve Magoffin (Sussex)
Ins: Kane Williamson (Overseas)
Outs: Ryan Sidebottom (retired), Will Rhodes (Warwickshire)