This is the 6716th most frequent Spanish word.
commerzbank
"Commerzbank" is not a Spanish word; it is the name of a German bank.
In this sentence, the word 'Commerzbank' serves as a proper noun and refers to the name of a financial company.
Commerzbank es uno de los bancos más grandes de Alemania.
Commerzbank is one of the largest banks in Germany.
Here, 'Commerzbank' again functions as a proper noun, mentioning the specific bank associated with the proper noun.
Visité una sucursal de Commerzbank durante mis vacaciones en Berlín.
I visited a branch of Commerzbank during my vacation in Berlin.
In this use, 'Commerzbank' denotes the entity where the investment department is located.