Insurance group Admiral has boosted the membership of its scheme from 1,100 to 2,000 since March through a staff awareness campaign.
Last week the government gave the first indication of the numbers it is likely to use for the earnings trigger and qualifying earnings band for auto-enrolment for 2013/2014.
The Department for Work and Pensions is set to begin a widespread advertising push on September 17 using "trusted voices" in the media to gain public support for auto-enrolment.
The Department for Work and Pensions has proposed to bring the auto-enrolment earnings thresholds into line with the personal tax limits for 2013/14.
Social housing repairs and maintenance provider Mears has chosen B&CE's master trust The People's Pension for its 13,000-strong workforce.
The Pensions Trust will launch a defined contribution multi-employer scheme for auto-enrolment later this year which specifically targets the UK's charity sector.
Employers need to do more to inform employees unaware of auto-enrolment Scottish Widows research shows.
Only one sector of British industry has bucked the trend of declining workplace pension savings, DWP figures reveal.