Engaged Capital initiated a 9.96% position in the health-care, administrative-services tech firm, equal to 8,553,155 Evolent Health shares. That position has remained unchanged, as noted by Engaged Capital’s latest disclosure. What has changed is that Engaged and Evolent entered into a cooperation agreement as of Dec. 21. Per the agreement, Evolent will increase the size of its board by one to accommodate the appointment of an Engaged representative to serve until at least next year’s annual shareholders meeting. Engaged Capital will abide by customary standstill agreements, and will limit its Evolent Health interest to no more than 12%. Original Filings Blackstone Group (BX) revealed a fresh position in the cybersecurity firm of 21,449,275 shares. All of the FireEye shares owned by Blackstone underlie preferred convertible securities, including 370,000 shares that underlie a 4.5% convertible preferred series offered through a private placement that closed on Dec. 11. With the latest investment, Blackstone has an 8.5% interest in FireEye. Two Blackstone directors currently serve on FireEye’s board.