The Jupiter Primadona Growth Trust has increased its dividend by almost 41% for the year ending 30 June.
M&G won the Outstanding Investment House accolade at last night's OBSR Honours Dinner, held at the Dorchester Hotel in London.
OBSR has handed its Rising Talent award to Jupiter's Cédric de Fonclare, manager of the European Special Situations fund.
Jupiter's Tony Nutt has dismissed fears the UK is headed back into recession and believes equity prices and dividends have "significant upside" potential.
Tony Nutt's Jupiter Income trust has seen its payout to investors fall by 9% after the £2.52bn fund was hit by the BP crisis.
Whitney George, who oversees $30bn at US small-cap specialist Royce, has taken a position in Jupiter on the view asset managers will thrive as the developed world looks to increase savings.
Jupiter's Charlie Thomas has begun modifying his £41m Green investment trust since taking over the whole portfolio.
Jupiter went into the black for the first half of 2010 with profits before tax of £14.6m compared to a loss of £6.5m for the same period last year.
Jupiter star manager Philip Gibbs will need to generate a higher return to obtain a performance fee this year after being forced to change the benchmark on his International Financials fund.