Leerink analyst David Larsen believes AmerisourceBergen (ABC) could benefit from KKR's (KKR) buyout of PharMerica (PMC). KKR and Walgreens Boots Alliance (WBA), which uses AmerisourceBergen as a supplier, are forming a new private company which would hold PharMerica, Larsen tells investors in a research note. He believes PharMerica may switch away from its current supplier Cardinal Health (CAH) as a result of today's deal and use AmerisourceBergen. Any potential change in distributor contracts would likely occur in the second half of 2018, the analyst adds.