He came to prominence as the player/manager of Yeovil Town during a historic F.A.Cup run in 1949. They had thrilling victories over Bury and Sunderland, before losing to Manchester United in the fifth round. He later managed Leyton Orient (1949-1959), AS Roma, QPR (1959-1965) (general manager 1965-1968), Luton Town (1968-1972), Fulham (1972-1976) and AFC Bournemouth (1979-1980). He was also the assistant manager of Arsenal for 53 days during the 1955/1956 season and was a director of QPR (1977-1979).
With internal pressures mounting in the club following the 1967/68 season however, Stock was absent for 3 months, suffering from asthma.citation needed In his book 'A Little Thing Called Pride' Stock tells how Jim Gregory sacked him in 1968 for being ill, just as he thought he was about to return to the helm and save Rangers from relegation.citation needed He later had success with Luton Town who he helped to promotion from the Third Division and also with Fulham when he led them to the 1975 FA Cup Final.