Branko Drobnak is the founder and president of the Business Angels Club of Slovenia, founded in 2007, which connects Slovenian startups with investors. The public also knows him as the founder and director of the brokerage house Poteza, founded in 1992, when the Slovenian investor market was still in its infancy. Drobnak is now active in the company Arima where he is engaged in investment banking. As a consultant, he advises several companies, and is actively involved in the advisory boards of Acies Bio.

As a business angel, Drobnak actively advises young entrepreneurs and invests in startups, as an individual or in collaboration with other business angels. His previous investments include companies such as Acies Bio and Double Recall. In recent years, he had advised companies such as DS Meritve, Datainfo, SparkLPG, Redstart Instrumentation and GlobalCore.