The Pensions Regulator (TPR) used its formal powers 50,068 times in just 12 months to ensure high levels of compliance with the auto-enrolment regime.
The watchdog's interventions between April 2016 and March 2017 rose by 468.2% since the previous year, according to its annual commentary and analysis.
It issued 33,716 compliance notices, 12,181 fixed penalty notices, 187 statutory demands for information, 2,527 escalating penalty notices, 1,193 unpaid contributions notices, 260 statutory inspection notices, and four warrants.
It is a huge surge from the period between April 2015 and March 2016 where it only used its powers on 8,812 occasions.
Just over three-quarters (78%) of employees are now in a workplace pension scheme, with over 1.6 million being auto-enrolled between April 2016 and March 2017 - an increase of 26% from last year.
Some 7.7 million staff have been auto-enrolled since the policy began in 2012, when just 47% of employees were members of a scheme.
Over 500,000 employers have completed their declaration of compliance since 2012, and TPR further aims to help steer more than 700,000 small and micro employers through workplace pension duties by February 2018.
The report also contains upper and lower estimates of the numbers of new employers expected to have pension duties until the start of 2020.
The regulator predicts around 73% of all small businesses, and nearly half of micro businesses, will have eligible staff based on its estimates of the numbers of employers left to stage.
Director of AE Darren Ryder urged anyone setting up a business to ensure they are ready to comply with the law so staff receive their entitled pensions.
He said: "Saving for retirement is becoming the social norm and the success of AE is playing a key role in this shift. Our figures show that new businesses will continue this trend as they ensure workers are enrolled into a workplace pension.
"AE is now simply part of running a business and from October, as soon as employers take on staff for the first time, they will have duties. More than half of these new businesses will need to set up a pension scheme so that staff can begin saving.
"The job of implementing AE is not complete and we are not complacent. We will be continuing to help steer hundreds of thousands of employers through their workplace pension duties. Those setting up a business should visit our website to find all the information required."
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