| Company | Description | Invested | Status |
Bartlett Holdings, Inc.
|
Radiological protection services to the U.S. nuclear industry
|
2004
|
Former
|
Clean Harbors, Inc.
|
Hazardous waste management and environmental services
|
1987
|
Former
|
FleetCor Technologies, Inc.
|
Fuel cards and workforce payment products
|
2002
|
Current
|
Innov-X Systems, Inc.
|
X-ray fluorescence elemental analyzers
|
2006
|
Former
|
Simulation Sciences, Inc.
|
Simulation software for the petroleum and chemical industries
|
1993
|
Former
|
Superior Services, Inc.
|
Waste management and environmental services
|
1993
|
Former
|
TransEnergy Holdings, Inc.
|
On-line exchange for energy trading
|
1996
|
Former
|
Welltec International
|
Precision robotic solutions for oil and gas wells
|
2007
|
Current
|