Total pay for the directors of the UK's top businesses rose 14% over the past year driven by a huge jump in share-based long term incentive payments, a pay research company has found.
Incomes Data Services (IDS) said this took the average pay for a director of a FTSE 100 firm to £3.3m.
IDS said basic pay rises were "relatively restrained" at 4% higher, while annual bonuses fell 8.8%.
But total pay rose thanks to a 58% rise in share-based long-term incentives.
And over the past ten years, the median total earnings of a FTSE 100 chief executive has gone up by 243%, Steve Tatton, editor of IDS's directors' pay report, told the BBC.
Mr Tatton said the survey illustrated the "complex make-up of boardroom remuneration".
"With nearly two-thirds of FTSE directors benefiting from an LTIP [long-term incentive plan] award in the latest year, the higher share-based payouts clearly made up for any ground lost in lower annual bonuses," he added.
A director is typically awarded a proportion of their salary in shares, which pay out only if the director hits their performance targets.
TUC general secretary Frances O'Grady said the survey's findings meant that top bosses' pay was growing 20 times faster than that of the average worker.
"It's one thing replacing bonuses with long-term incentive plans, but FTSE 100 companies are simply exploiting this change to make their fat cats even fatter," she said.