[3] Together they founded the publishing house Aux Quatre Vents (The Four Winds), for which they received a patent on 11 January 1548.

On a print by Johannes van Deutecum from 1560, the couple is portrayed in their shop (the rest of the building and street is from an architectural fantasy by Hans Vredeman de Vries).

The print has two inscriptions, "IIII vens" (i.e. Quatre Vents) and a pun based on the meanings in Dutch of their respective names, i.e. 'Cock' means 'a cook' and 'Volckx' means 'the people': "Laet de Cock coken om tvolckx wille" which literally translates as 'let Cock cook what his Volcxken wants' (a reference to his wife's important role) but also refers to the fact that their publishing house published what the market (the people) wanted.

Cock and Diericx specialized in high quality etchings and engravings, made by the best European specialists, offered a wide variety in subject selection, and exported to all corners of the world.

[4] From 1551 until Cock's death, the couple employed the engravers Pieter Breugel the Elder, Lucas and Joannes van Deutecum, Giorgio Ghisi, Cornelis Cort, Philips Galle, Maarten van Heemskerck, Lambert Lombard, Hans Vredeman de Vries, Michiel Coxcie and Frans Floris.