The US hedge fund D. E. Shaw has secured access to slightly over 5% of shares in Germany’s Commerzbank through financial instruments, according to a voting rights notification from the bank published on Monday. The move comes against the backdrop of a possible takeover of Commerzbank by Italy’s Unicredit banking group. Unicredit unexpectedly made a major investment in Commerzbank in September, driving up the share price of Germany’s second-largest private bank significantly. Unicredit used financial instruments to secure the option of increasing its stake in Commerzbank from 9% to 21%, a step …