| JDHD LLCCoral Gables, FL · Active | Coral Gables, FL | LLC | Mar 16, 2004 | Active |
| SPINAL CONCEPTS, LLCJacksonville Beach, FL · Active | Jacksonville Beach, FL | LLC | Jan 19, 2018 | Active |
| CRANIALDEV.LLCMelbourne, FL · Active | Melbourne, FL | LLC | Feb 10, 2020 | Active |
| DUNCAN PROPERTY MANAGEMENT LLCNaples, FL · Active | Naples, FL | Corporation | Aug 4, 2025 | Active |
| SERENITY DAO GUAN, INC.Ocala, FL · Active | Ocala, FL | Nonprofit | Sep 9, 2025 | Active |
| J & S CONSTRUCTION EQUIPMENT, INC.Pompano Beach, FL · Active | Pompano Beach, FL | Corporation | Dec 22, 2005 | Active |
| JD PROPERTIES, LLCRiverview, FL · Active | Riverview, FL | LLC | Mar 18, 2005 | Active |
| CRYSTAL RIVER HOMES, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Jun 12, 1974 | Inactive |
| DUNCAN SUNSET CORP.Miami, FL · Inactive | Miami, FL | Corporation | Jun 25, 1975 | Inactive |
| DUNCAN MANAGEMENT CORP.Miami, FL · Inactive | Miami, FL | Corporation | Jun 25, 1975 | Inactive |
| AIMCO CORPORATIONMiami, FL · Inactive | Miami, FL | Corporation | Nov 12, 1975 | Inactive |
| GEIGEL & WILLIAMS SYSTEMS, INC.Coral Gables, FL · Inactive | Coral Gables, FL | Corporation | Jun 15, 1976 | Inactive |
| JOHN E. DUNCAN, CORPORATIONFort Myers, FL · Inactive | Fort Myers, FL | Corporation | Nov 14, 1977 | Inactive |
| GENERAL LEASING, INC.Coral Gables, FL · Inactive | Coral Gables, FL | Corporation | Feb 16, 1978 | Inactive |
| AFFAIRS TO REMEMBER, INC.Tallahassee, FL · Inactive | Tallahassee, FL | Corporation | May 4, 1979 | Inactive |
| EXECUTIVE DATA SYSTEMS, INC.Miami, FL · Active | Miami, FL | Corporation | Sep 28, 1979 | Active |
| EAGLE'S LANDING HOMEOWNERS' ASSOCIATION, INC.Fort Myers, FL · Active | Fort Myers, FL | Nonprofit | Sep 23, 1983 | Active |
| BT LEASING CORPLocation not reported, FL · Inactive | Location not reported, FL | Corporation | Jul 8, 1974 | Inactive |
| BT LEASING SERVICES, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Sep 21, 1977 | Inactive |
| IDEA EGG INC.St. Petersburg, FL · Inactive | St. Petersburg, FL | Corporation | Jul 7, 1980 | Inactive |
| SPORTS ACCESSORIES AMERICA, INC.Location not reported, FL · Inactive | Location not reported, FL | Corporation | Feb 22, 1982 | Inactive |
| CROSSINGS GUN SHOP, INC.Miami, FL · Inactive | Miami, FL | Corporation | Apr 13, 1982 | Inactive |
| DATALAW, INC.Miami, FL · Active | Miami, FL | Corporation | Jun 1, 1982 | Active |
| AIDCO SYSTEMS, INC.Miami, FL · Inactive | Miami, FL | Corporation | Jan 26, 1983 | Inactive |
| LAWBILL, INC.Coral Gables, FL · Inactive | Coral Gables, FL | Corporation | Nov 22, 1983 | Inactive |
| J.D. WEST, INC.Miami, FL · Inactive | Miami, FL | Corporation | Jun 11, 1985 | Inactive |
| PROPERTY AND CASUALTY SERVICES, INC.Jacksonville Beach, FL · Inactive | Jacksonville Beach, FL | Corporation | Jul 14, 1988 | Inactive |
| VOLUSIA COUNTY SERVICES, LLCDaytona Beach, FL · Inactive | Daytona Beach, FL | LLC | Dec 2, 2004 | Inactive |
| JDCW - IP MANAGEMENT LLCCoral Gables, FL · Inactive | Coral Gables, FL | LLC | Oct 3, 2011 | Inactive |
| DUNCAN AND SON'S GAMING LLCCape Coral, FL · Inactive | Cape Coral, FL | LLC | Sep 28, 2020 | Inactive |
| DUNCAN SALTWORKS LLCCrestview, FL · Inactive | Crestview, FL | LLC | Jun 27, 2024 | Inactive |
| TRUE MOUNT LLCNorth Bay Village, FL · Active | North Bay Village, FL | LLC | Aug 2, 2024 | Active |
| CCS-DUNCAN, LLCLocation not reported, FL · Inactive | Location not reported, FL | LLC | Jun 30, 2005 | Inactive |
| BIG BEAR SHEEPHORN LLCLocation not reported, FL · Inactive | Location not reported, FL | LLC | Dec 28, 2022 | Inactive |
| EXECUTIVE DATA COST MANAGEMENT, INC.Miami, FL · Inactive | Miami, FL | Corporation | May 2, 1986 | Inactive |
| WHICH WAY IS UP - AEROBATICS INC.Coral Gables, FL · Inactive | Coral Gables, FL | Corporation | Jul 2, 1986 | Inactive |
| GLOBAL BABY PRODUCTS, INC.Fort Lauderdale, FL · Inactive | Fort Lauderdale, FL | Corporation | Aug 31, 1987 | Inactive |
| CONCERNED CITIZENS OF HOLIDAY LAKE APARTMENTS, INC.Pompano Beach, FL · Inactive | Pompano Beach, FL | Nonprofit | Apr 18, 1994 | Inactive |
| PALM HARBOR NIGHTHAWKS SOCCER CLUB, INC.Palm Harbor, FL · Inactive | Palm Harbor, FL | Nonprofit | Sep 2, 1997 | Inactive |
| COASTAL DESIGN INVESTMENT, INC.Crystal River, FL · Inactive | Crystal River, FL | Corporation | Jan 30, 2004 | Inactive |
| JOHN DUNCAN, INC.Tamarac, FL · Inactive | Tamarac, FL | Corporation | May 11, 2004 | Inactive |
| GARBER-DUNCAN ENTERPRISES, INC.Palm Bay, FL · Inactive | Palm Bay, FL | Corporation | Jun 15, 2004 | Inactive |
| W.J. LEASING, INC.Davie, FL · Inactive | Davie, FL | Corporation | Apr 8, 2005 | Inactive |
| ACR LEASING, INC.Davie, FL · Inactive | Davie, FL | Corporation | Aug 25, 2006 | Inactive |
| COFFEE SERVICE OF AMERICA, INC.Davie, FL · Inactive | Davie, FL | Corporation | Apr 18, 2008 | Inactive |
| RAVENS MOON A & E, INC.Lauderhill, FL · Inactive | Lauderhill, FL | Corporation | May 6, 2019 | Inactive |
| FUTURECOMP INC.Boynton Beach, FL · Inactive | Boynton Beach, FL | Corporation | Sep 29, 1994 | Inactive |
| PERFECTLAW, INC.Coral Gables, FL · Inactive | Coral Gables, FL | Corporation | Oct 23, 1995 | Inactive |
| SILVER & GOLD ENTERPRISES OF HERNANDO, INC.Palm Harbor, FL · Inactive | Palm Harbor, FL | Corporation | Jan 9, 1998 | Inactive |
| DECAT AIR, INC.Miami, FL · Inactive | Miami, FL | Corporation | Aug 5, 1999 | Inactive |