Southampton made a £33.4m profit last year - the first since the club went into administration in 2009.
The Premier League club's results for the year ending 30 June 2014 showed an increase after a £7.1m loss in 2013.
A record TV rights deal helped total revenue increase from £71.8m to £106m.
However chief financial officer David Bence said: "The profit from player trading has all been reinvested in transfer fees, player wages and additional football-related costs, in order to support the aspirations of the 2014/15 season."
The annual figures also confirmed that the club has approximately £50m debt, although the balance sheet showed net assets worth £31.8m, compared to liabilities of £1.6m last year.
Chief executive officer Gareth Rogers said: "It shows the health of the club and the group is strong and the foundations are there to be built on."
Swiss investor Markus Liebherr brought the then League One club out of administration before successive promotions earned Saints a Premier League place in 2012.