Stay up to date with the latest player signings, moves and speculation from all the counties.
Counties are allowed to field two overseas players in Twenty20 games, with up to four registered for that competition, although only two can be registered at any one time, and registrations must be for a minimum of 10 days.
Only one overseas player is permitted in the County Championship and One-Day Cup competitions.
Guide to abbreviations
Also shows, where relevant, players' previous counties
KPK: Kolpak contract
YTH: From youth teams
EUP: European Union passport
UKP: Born overseas, but has UK passport
Kolpak contracts are signed by foreign players, using a European Court ruling to avoid counting against the quota of one overseas player per club.
Players who moved counties or retired during the 2015 season are included on the 2015 list. Have we missed anyone? Please let us know.
Other news: Billy Godleman replaced Wayne Madsen as County Championship captain, with Wes Durston continuing as limited-overs skipper and Hamish Rutherford as vice-captain. Elite performance director Graeme Welch resigned in June, with elite performance coach John Sadler taking over.
Trialist Hamza Ali, who had made one first-class appearance for Hampshire, died in June.
Other news: Jimmy Adams stepped down as club captain, with James Vince taking over. Sean Ervine led the limited-overs side while Vince was on England duty, with Will Smith deputising in the County Championship.
Other news: The county "restructured" their coaching staff over the 2015-16 winter, with senior coaches Lloyd Tennant and Ben Smith leaving, while Keith Piper (elite development coach) and Pierre de Bruyn (Second XI & assistant skills coach) joined elite performance director Andrew McDonald's staff. Charlie Shreck became bowling development coach but remains a player. Nic Pothas joined as academy director but left the club in July to become Sri Lanka's fielding coach, while Carl Crowe arrived in the same month to help coach the Second XI until the end of the season. Pettini took over the limited-overs captaincy from Mark Cosgrove, who continues to lead in the County Championship.
Other news: Voges captained Middlesex in the County Championship, while Dawid Malan and James Franklin led the side in the T20 Blast and One-Day Cup respectively. They replaced Eoin Morgan, who led the club in limited-overs cricket in 2015.
Overseas player: Dan Christian (Australia, primarily for limited-overs cricket), Jackson Bird (Australia, for Championship cricket until 6 July); Andre Russell (West Indies, for Twenty20, 10-24 June plus Finals Day), Imran Tahir (South Africa, from July)
Other news: Ed Joyce stood down as Championship and one-day captain, with Twenty20 captain Luke Wright taking over in all forms of the game. Coach Mark Robinson was appointed head coach of the England women's team and replaced by Mark Davis. Keith Greenfield is director of cricket, with bowling coach Jon Lewis becoming assistant head coach, Carl Hopkinson as academy director and Murray Goodwin as batting coach. After several years as Sussex's overseas player, Steve Magoffin was able to feature as a local player from 2016 after gaining UK citizenship.