The youth and community charity The Challenge has been awarded more than a third of the contracts to run the National Citizen Service over the next four years.
The NCS Trust, which operates the National Citizen Service on behalf of the government, has announced the 10 organisations that will operate the scheme in 19 regions in England between 2015 and 2018.
Seven of the 10 providers are charities or social enterprises, which will operate a total of 13 regional contracts.
The Challenge, which is registered with the Charity Commission as the Challenge Network and already operates five NCS contracts, has been awarded seven contracts over the next four years.
Other voluntary sector contract winners, which remain subject to government sign-off, include the Football League Trust, a partnership between vInspired and the National Youth Agency, and the Lincolnshire and Rutland Education Business Partnership.
The non-voluntary sector providers, which will run a total of six contracts, are the Pertemps People Development Group, Ingeus and Reed in Partnership.
NCS offers 16 and 17-year-old school leavers the chance to take part in seven or eight-week projects that include community work, a physical challenge and a residential placement.
The NCS Trust said that 24 organisations placed initial bids for contracts under the scheme.
Doug Fraley, director of operations at the NCS Trust, said: "After a rigorous bidding process, we are pleased to announce the selection of the 10 successful organisations, all of which submitted excellent applications, not only from a cost and quality perspective, but also from a position of experience and passion.
"Beneath these 10 providers, 220 organisations currently work to deliver NCS at a local level and we hope to see this network grow as the programme expands over the coming years."