Arriva operated and operates bus lines in certain counties in the Stockholm Region: Sigtuna County, Upplands Vaesby County and Vallentuna County from the 1st of March 2009 until the 21st of June 2019. In Ekeroe County, traffic started on the 1st of March 2009 however Arriva won this contract again in 2019. The E32 contract which was procured in 2019 had three contesters Arriva who came on first place, Nobina who came on second place and Transdev who came on third place. In August 2012 Arriva began operation in western Stockholm with 255 buses under a 12-year contract with the regional transport authority. In January 2013 a further 229 buses were added.