Cisco, Microsoft, Hewlett-Packard are a few major players in this market. It's hard to estimate how much this will impact their stock prices.
Beside global players, there're many players in every local market. For instance, Kinetik It is a managed service provider serving Phoenix Arizon area.
The global managed services market was estimated at USD 155.91 billion in 2017, and is expected to reach USD 296.38 billion by 2023, or a yearly 11.32% growth during the five year forecast period.