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Exhibit 8.1
EMPRESAS ICA, S.A. DE C.V.
20-F 2005
SIGNIFICANT SUBSIDIARIES
PRINCIPAL COUNTRY OF OWNERSHIP VOTING POWER
SUBSIDIARY ACTIVITY INCORPORATION INTEREST HELD
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Constructoras ICA,
S.A. de C.V......................... Construction Mexico 100% 100%
Controladora de Operaciones de
Infraestructura, S.A. de C.V........ Real estate and concessions Mexico 100 100
Promotora e Inversora ADISA, Real estate and heavy
S.A. de C.V......................... construction Mexico 100 100
Controladora de Empresas de
Vivienda, S.A. de C.V............... Housing development Mexico 100 100
International holding
ICATECH Corporation.................... company United States 100 100
Rodio/KronsaCimentaciones
Especiales, S.A..................... Sub-soil construction Spain 50 50
Ingenieros Civiles Asociados, Heavy and urban
S.A. de C.V......................... construction Mexico 100 100
ICA - Fluor Daniel,
S. de R.L. de C.V................... Industrial construction Mexico 51 51
Highway construction
ICA Panama, S.A........................ concessionaire Mexico 100 100
Consortium for the
construction of the El
Constructora Internacional de Cajon hydroelectric
Infraestructura, S.A. de C.V. ...... project Mexico 75 75
Grupo Aeropotuario del Centro Norte,
S.A. de C.V............................ Airport operations Mexico 47 51