The Swiss Conspiracy, (Secret Private Banking)

The Swiss Conspiracy (1976 film plot)
A Swiss bank learns that the confidentiality of several anonymous numbered accounts has been compromised and blackmail threats have been made to five holders of the accounts. They include a crooked arms dealer, who received a demand for five million Swiss francs. He refuses to pay and is shot dead. The bank is also told to pay ten million francs to keep the accounts secret.

The bank hires David Christopher a former U.S. Treasury official who now resides in Geneva. In the course of his investigation, Christopher talks to the four living blackmailees - beautiful Zürich resident Denise Abbott, Texas businessman Dwight McGowan Chicago crook Robert Hayes and Dutchman Andre Kosta.

He identifies a number of suspects. One is Rita Jensen, the mistress of the bank's vice-president, Franz Benninger. There is also Benninger himself as well as Korsak and Sando, who are out to kill Hayes and Christopher.

Bank president Johann Hurtil cannot believe that Benninger is corrupt. However, it emerges that the latter transferred control of a bank account to his mistress, who was legally entitled to it but didn't have the correct documents.

https://en.wikipedia.org/wiki/The_Swiss_Conspiracy
https://www.youtube.com/watch?v=dm2ebktWql4

The International (2009 film plot):
Louis Salinger, an Interpol detective, and Eleanor Whitman, an Assistant District Attorney from Manhattan, are assigned to investigate the International Bank of Business and Credit (IBBC), which funds criminal activities such as money laundering, terrorism, arms trading, and the destabilization of governments. Salinger's and Whitman's investigation takes them to Milan, where the IBBC assassinates Umberto Calvini, an arms manufacturer and Italian prime ministerial candidate. The assassin diverts suspicion to a local assassin with political connections to the Red Brigades, who is then promptly killed by a corrupt policeman. Salinger and Whitman get a lead on the second assassin, but the policeman confronts the two and orders them out of the country. At the airport, they are able to check the security camera footage for clues on the whereabouts of the bank's assassin, and follow a suspect to New York City.

In New York, Salinger and Whitman are met by two New York Police Department (NYPD) detectives, Iggy Ornelas and Bernie Ward, who have a photograph of the assassin's face. Salinger, Ornelas, and Ward locate Dr. Isaacson to whose practice the assassin's leg brace has been traced, and they are able to follow him to the Solomon R. Guggenheim Museum.

Jonas Skarssen, the chairman of the IBBC, reveals to his lawyer White and security adviser Wexler that Calvini was killed so that they could have his sons buy missile guidance systems in which the bank has invested. Since the bank knows that Salinger and Whitman are close to finding their assassin, they send a team of hitmen to kill him, while Wexler is arrested by Ornelas. As Salinger and Ward speak to the assassin and attempt to arrest him, a shootout at the Guggenheim erupts when a number of gunmen attack them. Ward is killed in the chaos, and Salinger is forced to team up with the assassin to fight off the gunmen. However, the assassin is mortally wounded during their escape and dies of his injuries.

https://en.wikipedia.org/wiki/The_International_(2009_film)
https://www.youtube.com/watch?v=ls05PsIEaMI
https://www.youtube.com/watch?v=LFqx2sROwsE&t=1s
https://www.youtube.com/watch?v=pwgh9hZkXUY
https://www.youtube.com/watch?v=pgORZsOltjM