[CUSIP No. 19241Q101 Page 2 of 7 1. NAMES OF REPORTING PERSONS Phillip Frost, M.D. 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (see instructions) (a) ☒ (b) ☐ 3. SEC USE ONLY 4. SOURCE OF FUNDS (see instructions) N/A 5. 6. CITIZENSHIP OR PLACE OF ORGANIZATION NUMBER OF SHARES BENEFICIALLY OWNE]