DERBYSHIRE
In: Luis Reece (Lancashire), Gary Wilson (Surrey), Hardus Viljoen, Daryn Smit
Out: Wes Durston (mutual consent), Neil Broom, Chesney Hughes, Harry White (all released), Callum Pakinson (Leicestershire)
Overseas: Jeevan Mendis (Sri Lanka - April-June), Imran Tahir (South Africa - June-September), Matt Henry (New Zealand - T20 Blast)
DURHAM
In: Cameron Steel (Middlesex)
Out: Scott Borthwick (Surrey), Mark Stoneman (Surrey), Asher Hart (Hampshire), Phil Mustard (Gloucestershire), Gordon Muchall (retired), Jamie Harrison, Calum MacLeod, Gurman Randhawa (all released)
Overseas: Stephen Cook (South Africa - April-June), Tom Latham (New Zealand - July-September)
ESSEX
In: Simon Harmer, Adam Wheater (Hampshire), Varun Chopra (Warwickshire)
Out: Graham Napier, David Masters (both retired), Tom Moore (released), Jaik Mickleburgh, Jesse Ryder
Overseas: Neil Wagner (New Zealand - April-June), Mohammad Amir (Pakistan - June-September)
GLAMORGAN
In:
Out: James Kettleborough, Dewi Penrhyn Jones (both released), Mark Wallace (retired)
Overseas: Jacques Rudolph (South Africa)
GLOUCESTERSHIRE
In: Phil Mustard (Durham)
Out: Hamish Marshall, Tom Hampton (both released)
Overseas: Cameron Bancroft (Australia), Michael Klinger (Australia), Andrew Tye (Australia - T20 Blast)
HAMPSHIRE
In: Fidel Edwards, Fraser Hay, Asher Hart (Durham), Kyle Abbott, Rilee Rossouw
Out: Andy Carter, James Tomlinson (both retired), Ryan McLaren (Lancashire), Adam Wheater (Essex), Joe Weatherley (Kent, loan)
Overseas: George Bailey (Australia)
KENT
In: Will Gidman (Nottinghamshire), Joe Weatherley (Hampshire, loan)
Out: David Griffiths, Sam Weller (both released)
Overseas:
LANCASHIRE
In: Shivnarine Chanderpaul, Dane Vilas, Brook Guest
Out: Tom Smith (retired), Luis Reece (Derbyshire), Nathan Buck (Northants), Gavin Griffiths (Leicestershire), George Edwards, Alviro Petersen (both released)
Overseas: Ryan McLaren (South Africa), Junaid Khan (Pakistan - T20 Blast)
LEICESTERSHIRE
In: Callum Parkinson (Derbyshire), Richard Jones (Warwickshire), Colin Ackermann, Harry Dearden, Dieter Klein, Gavin Griffiths (Lancashire), James Burker (Surrey, loan)
Out: Jigar Naik, Ollie Freckingham, Michael Burgess, Rob Taylor, Atif Sheikh, Niall O'Brien (all released)
Overseas: Luke Ronchi (New Zealand - T20 Blast), Clint McKay (Australia), Cameron Delport (South Africa - T20 Blast)
MIDDLESEX
In:
Out: Max Holden (Northants, loan until June), Cameron Steel (Durham), Andrew Balbirnie (released)
Overseas: Adam Voges (Australia), Brendon McCullum (New Zealand - T20 Blast)
NORTHAMPTONSHIRE
In: Nathan Buck (Lancashire), Max Holden (Middlesex, loan until June)
Out: Olly Stone (Warwickshire)
Overseas: Rory Kleinveldt (South Africa), Seekkuge Prasanna (Sri Lanka - T20 Blast)
NOTTINGHAMSHIRE
In: Ben Kitt
Out: Sam Wood (released), Imran Tahir (Derbyshire), Will Gidman (Kent)
Overseas: Dan Christian (Australia - T20 Blast), James Pattinson (Australia), Ish Sodhi (New Zealand - T20 Blast)
SOMSERSET
In: Steven Davies (Surrey), George Bartlett
Out: Chris Rogers (retired), Alex Barrow (released)
Overseas: Dean Elgar (South Africa)
SURREY
In: Scott Borthwick (Durham), Mark Stoneman (Durham), Kevin Pietersen (T20 Blast)
Out: Steven Davies (Somerset), Gary Wilson (Derbyshire), James Burke (Leicestershire, loan), Azhar Mahmood (released)
Overseas: Kumar Sangakkara (Sri Lanka), Aaron Finch (Australia - T20 Blast)
SUSSEX
In: Stiaan van Zyl, Laurie Evans (Warwickshire), David Wiese
Out: Craig Cachopa, Fynn Hudson-Prentice (both released), Lewis Hatchett (retired)
Overseas: Vernon Philander (South Africa - April-June), Ross Taylor (New Zealand - T20 Blast)
WARWICKSHIRE
In: Olly Stone (Northants)
Out: Recordo Gordon, Jonathan Webb, Freddie Coleman (all released), Varun Chopra (Essex), Richard Jones (Leicestershire), Laurie Evans (Sussex)
Overseas: Jeetan Patel (New Zealand), Colin de Grandhomme (New Zealand - T20 Blast)
WORCESTERSHIRE
In:
Out: Chris Russell (released)
Overseas: John Hastings (Australia), Mitchell Santner (New Zealand - T20 Blast)
YORKSHIRE
In:
Out: Andrew Gale (retired)
Overseas: Peter Handscomb (Australia), Travis Head (Australia - T20 Blast)