TPA Horwath is an active member of the following chambers and regularly takes part in their activities:

• German Croatian Chamber of Industry and Commerce
• Croatian-Austrian Chamber of Commerce
• American Chamber of Commerce in Croatia (AmCham)
• Nordic Chamber of Commerce in Croatia
• The British-Croatian Chamber of Commerce (BCCC)

Along with the relevant chambers, TPA Horwath collaborates with the following universities:

• University of Wien
• University of applied sciences Eisenstadt
• University of Graz