Who is the owner of SLEX?

Excuse me, but could you clarify who exactly holds the ownership of SLEX? Is it a private company, a government entity, or perhaps a consortium of investors? I'm interested in understanding the structure and the stakeholders involved in the management and operation of this particular expressway. Additionally, is there any information on the history of ownership, such as any major changes or transfers that have occurred over time? Thank you for your assistance in shedding light on this matter.