| | | | | |
| | | | | Percentage of |
| | | | | Voting |
| | | | | Securities |
| | | | | Owned by |
| | | State of | | Immediate |
| Name | | Incorporation | | Parent |
| ABM Industries Incorporated | | Delaware | | Registrant |
| (*) ABM Facility Services Company | | California | | 100% |
| ABM Engineering Services Company | | California | | 100% |
| ABM CMS, Inc. | | California | | 100% |
| ABM Janitorial Services, Inc. | | Delaware | | 100% |
| ABM Co. of Boston | | California | | 100% |
| ABM Janitorial Midwest, Inc. | | California | | 100% |
| ABM Janitorial Services — Mid-Atlantic, Inc. | | California | | 100% |
| ABM Janitorial Services — North Central, Inc. | | California | | 100% |
| ABM Janitorial Services — Northeast, Inc. | | California | | 100% |
| ABM Janitorial Services — Northern California | | California | | 100% |
| ABM Janitorial Services — Northwest, Inc. | | California | | 100% |
| ABM Janitorial Services — Puerto Rico, Inc. | | California | | 100% |
| ABM Janitorial Services — South Central, Inc. | | California | | 100% |
| ABM Janitorial Services — Southeast, LLC | | California | | 100% |
| ABM Janitorial Services — Southwest, Inc. | | California | | 100% |
| ABM Janitorial Services FSG, LLC | | California | | 100% |
| ABM Shared Services, Inc. | | California | | 100% |
| American Building Maintenance Co. of Hawaii | | California | | 100% |
| Allied Maintenance Services, Inc. | | Hawaii | | 100% |
| OneSource Holdings, LLC | | Delaware | | 100% |
| OneSource Facility Services, LLC | | Delaware | | 100% |
| OneSource Energy Services, LLC | | Delaware | | 100% |
| OneSource Painting, Inc. | | Delaware | | 100% |
| OneSource Property Holdings, Inc. | | Delaware | | 100% |
| OneSource Landscape & Golf Services, Inc. | | Delaware | | 100% |
| Servall Services, Inc. | | Texas | | 100% |
| SM Newco Corp. | | Delaware | | 100% |
| ABM Janitorial Services Co., Ltd. | | Brit. Columbia | | 100% |
| ABM Payroll Service, Inc. | | California | | 100% |
| ABM Security Services, Inc. | | California | | 100% |
| SSA Security, Inc. | | California | | 100% |
| Elite Security, Inc. | | California | | 100% |
| American Public Services | | California | | 100% |
| Ampco Pacific Airpark, LLC | | California | | 60% |
| Ampco System Parking | | California | | 100% |
| Amtech Energy Services | | California | | 100% |
| Amtech Lighting and Electrical Services | | California | | 100% |
| Amtech Lighting Services | | California | | 100% |
| Amtech Lighting Services of the Midwest | | California | | 100% |
| Amtech Reliable Elevator Company of Texas | | Texas | | 100% |
| Beehive Parking, Inc. | | Utah | | 100% |
| Canadian Building Maintenance Company, Ltd. | | Brit. Columbia | | 100% |
| Supreme Building Maintenance, Ltd. | | Brit. Columbia | | 100% |
| OneSource Services, LLC | | Delaware | | 100% |
| System Parking, Inc. | | California | | 100% |
