| ORLANDO QUALITY MOTEL-WEST, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Aug 24, 1971 | Inactive |
| L.M. DUNCAN & SONS, INC.St. Petersburg, FL · Inactive | St. Petersburg, FL | Corporation | Feb 5, 1974 | Inactive |
| ROYAL COACH TOURS & FLYING CARPET TRAVEL, INC.Orlando, FL · Inactive | Orlando, FL | Corporation | Jun 8, 1976 | Inactive |
| ORLANDO AREA ACCOMODATIONS, INC.Orlando, FL · Inactive | Orlando, FL | Nonprofit | Nov 28, 1973 | Inactive |
| DUNCAN'S TRAVEL'S, INC.Orlando, FL · Inactive | Orlando, FL | Corporation | Dec 11, 1984 | Inactive |
| WEST COLONIAL INN, INC.Orlando, FL · Inactive | Orlando, FL | Corporation | Mar 3, 1987 | Inactive |
| DEI OF FLORIDA, LLCOrlando, FL · Inactive | Orlando, FL | LLC | Jul 26, 2005 | Inactive |
| SIGNATURE SENIOR CARE LLCSt. John, FL · Inactive | St. John, FL | LLC | Mar 16, 2010 | Inactive |
| DUNCAN ENTERPRISES OF CENTRAL FLORIDA, INC.Orlando, FL · Inactive | Orlando, FL | Corporation | Feb 27, 2002 | Inactive |
| ROBERT L. DUNCAN, JR., M.D., PH.D., P.A.Hudson, FL · Inactive | Hudson, FL | Corporation | Apr 26, 2002 | Inactive |
| ISLAND CONSTRUCTION AND RENOVATION, INC.Indialantic, FL · Inactive | Indialantic, FL | Corporation | Jul 11, 2003 | Inactive |
| WOODWORKS MUSIC INDUSTRIES, INC.Orlando, FL · Inactive | Orlando, FL | Corporation | Nov 8, 2005 | Inactive |
| WOODWORK MUSIC GROUP, INC.Orlando, FL · Inactive | Orlando, FL | Corporation | Nov 8, 2005 | Inactive |
| D & V OF CENTRAL FLORIDA INCKissimmee, FL · Inactive | Kissimmee, FL | Corporation | May 17, 2007 | Inactive |
| CERTIFIED HOME INSPECTIONS OF ORLANDO INCOrlando, FL · Inactive | Orlando, FL | Corporation | May 5, 2009 | Inactive |
| THE DUNCAN ZOO INC.Tampa, FL · Inactive | Tampa, FL | Corporation | Jul 13, 2010 | Inactive |
| R.A.E.ENTERPRISES OF ORLANDO INCOcoee, FL · Inactive | Ocoee, FL | Corporation | Nov 1, 2012 | Inactive |
| EISHUNDO ORGANICS INCJacksonville, FL · Inactive | Jacksonville, FL | Corporation | Jul 15, 2013 | Inactive |
| DUNCAN ENTERPRISES/AUTO PARTS, INC.Orlando, FL · Inactive | Orlando, FL | Corporation | Apr 17, 1995 | Inactive |
| THE HISTORIC STATE THEATRE SHOW AND DINNER CO.Plant City, FL · Inactive | Plant City, FL | Corporation | Jul 13, 1998 | Inactive |
| DUNCAN ROOFS, INC.St. Petersburg, FL · Inactive | St. Petersburg, FL | Corporation | Sep 3, 1991 | Inactive |