[root@bzrzb11 jobarranger]# systemctl list-units --type=service --state=running
UNIT                            LOAD   ACTIVE SUB     DESCRIPTION                                        
amazon-cloudwatch-agent.service loaded active running Amazon CloudWatch Agent                            
amazon-ssm-agent.service        loaded active running amazon-ssm-agent                                   
auditd.service                  loaded active running Security Auditing Service                          
chronyd.service                 loaded active running NTP client/server                                  
crond.service                   loaded active running Command Scheduler                                  
dbus.service                    loaded active running D-Bus System Message Bus                           
getty@tty1.service              loaded active running Getty on tty1                                      
httpd.service                   loaded active running The Apache HTTP Server                             
irqbalance.service              loaded active running irqbalance daemon                                  
jobarg-agentd.service           loaded active running Jobarranger Agent                                  
jobarg-server.service           loaded active running Jobarranger Server                                 
mysqld.service                  loaded active running MySQL Server                                       
NetworkManager.service          loaded active running Network Manager                                    
php-fpm.service                 loaded active running The PHP FastCGI Process Manager                    
polkit.service                  loaded active running Authorization Manager                              
rhsmcertd.service               loaded active running Enable periodic update of entitlement certificates.
rsyslog.service                 loaded active running System Logging Service                             
serial-getty@ttyS0.service      loaded active running Serial Getty on ttyS0                              
sshd.service                    loaded active running OpenSSH server daemon                              
systemd-journald.service        loaded active running Journal Service                                    
systemd-logind.service          loaded active running Login Service                                      
systemd-udevd.service           loaded active running udev Kernel Device Manager                         
tuned.service                   loaded active running Dynamic System Tuning Daemon                       
user@0.service                  loaded active running User Manager for UID 0                             
zabbix-agent.service            loaded active running Zabbix Agent                                       
zabbix-server.service           loaded active running Zabbix Server                                      

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.

26 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.