Few networks control the majority of the charging network market.
The US DOE’s Office of Energy Efficiency & Renewable Energy released an interesting comparison of charging networks by the number of stations (one can be equipped with several charging outlets/chargers).
As it turns out, there are well over 22,000 charging stations (with nearly 60,000 outlets) and over 60% of them belong to one of four charging networks - ChargePoint, Tesla, Blink, and SemaCharge.
There are differences between who is the biggest player in AC Level 2 stations and DC fast chargers. Among the 19,975 AC stations, some 37% are connected by ChargePoint and another 13% by Tesla, followed by Blink (8%). On the other hand, EVgo took 31% out of 2,368 DC fast charging stations, followed by Tesla (17%), ChargePoint (15%) and Greenlots (10%).
Charging

Particular networks vary as to whether they are more into AC or DC charging.

DC: 2,368
- EVgo - 31%
- Tesla - 17%
- ChargePoint - 15%
- Greenlots - 10%
- Blink - 4%
- AeroVironment - 2%
- OpConnect - 0.7%
- Electrify America - 0.3%
- EV Connect - 0.2%
- Unknown - 20%

AC: 19,975
- ChargePoint - 37%
- Tesla - 13%
- Blink- 8%
- SemaCharge- 6%
- GE WattStation - 3%
- EVgo- 2%
- Greenlots - 1%
- EV Connect - 1%
- Unknown - 28%
"Level 2 charging stations can be used residentially or commercially to provide electricity faster than a standard 120-volt outlet. ChargePoint has the largest number of non-residential level 2 charging stations followed by Tesla. DC fast charging stations allow for long distance travel of EVs by providing quick recharge rates along highways and well-traveled corridors between metropolitan areas. The eVgo Network has the largest number of DC fast charging stations followed by Tesla with its SuperCharger network.
Note: A station is a non-residential address where Electric Vehicle Supply Equipment (EVSE) are located, including both public and private stations. There may be several charging outlets at each station.
Level 2 Chargers deliver AC power that provides about 10-20 miles of range per hour of charging.
DC Fast Chargers deliver DC power that provides about 60-80 miles of range per 20 minutes of charging.
For more information on EVSE, see the Alternative Fuels Data Center.
Source: U.S. Department of Energy, Alternative Fuels Data Center, Alternative Fueling Station Locator, accessed August 14, 2018."
Source: energy.gov