Social Return on Investment

there are 4 companies they have work as Social Return on Investment (i will attach file with website of the companies to use it as sources note that only use this 4 website as source) I want you to write each company’s background such as when they establish and what they did ? also what type of business that they did as busiess in SROI ? Also what is their weakness and strength in SROI? please also i need the refrences page for the websites