Tottenham have confirmed the appointment of Paul Mitchell as their new Head of Recruitment and Analysis.
Leeds United striker Nicky Ajose has joined Sky Bet League One side Crewe on an emergency loan deal.
Stock's move to Turf Moor from Doncaster on a two-year deal reunites the 30-year-old with former Bournemouth team-mate Howe.
Stock is Howe's sixth summer signing and the Clarets chief told the club's official website: "Brian is a very good footballer who will suit how we play.
"He is someone we admired for a long time. He had a really good career at Doncaster and I thought he was impressive in the games he played against us over the past couple of years.
"Experience and leadership are two things we haven't got a great deal of and I certainly think he will add in those two areas."