The team from Succession Group battled through storm force winds and torrential rain to travel over 100km in circumnavigating the island on Saturday.
They hope to raise £10,000 for money for children's hospices across the south west.
So far they have managed to bring in £3,831.
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The team comprised Keith Brown, Nikki Brown, Kevin McIntyre, Christopher Mellor, Chris Sweeten, Mark Walsh and Paula Watson. They represented three client service hubs.
Children's Hospice South West, which operates across the south west in North Devon, North Somerset and Cornwall, will benefit from the cash raised.
The charity is based near Succession's head office in Plymouth.
On their justgiving page, the team said: "The charity exists to make the most of short and precious lives providing expert holistic and family centered care for life-limited children and their families across the South West.
"They do the most amazing work and we would urge you to visit their website chsw.org.uk. The children they look after are not as fortunate as we are so our team is taking on this challenge to raise funds to support them in the great work they do."
Group chief executive Simon Chamberlain said: "We have raised funds for Children's Hospice South West every year since we launched.
"Our challenge team represents three of our client servicing hubs. Their commitment is magnificent, and the support from colleagues has been incredible. The funds raised will make a real difference to the work carried out by the charity."
Sarah Stott, the charity's corporate partnerships fundraiser, said: "Well done to team Succession for their challenge this weekend. I know they have trained hard for this mammoth walk and have been busy doing lots of fundraising for us too. Thank you for helping to make the most of short and precious lives."