The 36-year old has penned a contract extension which will see him remain at St Mary's until 2016.
Davis arrived at Southampton in 2006 and has since made close to 300 appearances for the Saints.
"When I first came to this club, to say that I would have been here for this period of time is something that I would have dreamed about," Davis the club's official website.
"For that dream to have materialised and for me to be feeling good is something I am really, really pleased with.
"I've seen a few things - a few ups and downs - but since (chairman) Nicola Cortese arrived with Markus Liebherr, the club has been on a journey.
"If those guys hadn't been here then I certainly wouldn't have been either, and it's great that I've been a part of that under Nicola's leadership. That has allowed me to fulfil my dream.