Any type of company can apply to this call, but funding rate (up to 90%) will differenciate according to it. The definition of small or medium enterprise (SME) is described here: User Guide to the SME Definition as well as in the COMMISSION RECOMMENDATION of 6 May 2003 concerning the definition of micro, small and medium-sized enterprises.
Please also note that the check of the type of company will be complete if your application is selected for funding.