Credit Suisse's CEO struck a cautious tone in light of political and economic uncertainty exacerbated by last month's Brexit vote, even as he hailed the bank's progress with its new strategy in the second quarter, when its investment banking and trading units created in October recorded their first profits.

Presenting the second-quarter results on July 28, Tidjane Thiam said in a letter to the bank's shareholders that macro and geopolitical worries mean he is "cautious" in his outlook as he continues a group restructuring.