By Ulrike Dauer

FRANKFURT--Deutsche Bank AG (DB) is appealing a ruling by a Frankfurt labor court that the bank wrongfully dismissed and had to reinstate four money-market traders whom it had fired as part of an internal probe into alleged benchmark interest rate manipulation.

A spokesman for Deutsche Bank said Wednesday the bank has filed the appeal. The appeals labor court, the Landesarbeitsgericht Frankfurt, received the appeal Nov. 15, a spokesman for the court said.

The court spokesman said a hearing of the appeal wouldn't take place before June, at the earliest. All traders remain reinstated in the workplace during the appeal proceedings.

The bank had to file the appeal within four weeks of receiving the written judgment by the lower labor court, under German law. It has another four weeks to file a legal rationale for the appeal.

The lower Frankfurt labor court ruled in September that the dismissals weren't justified as the bank didn't have proper internal rules and controls in place and didn't ensure adequate separation of rate submitting and derivatives trading. It also ruled that all four individuals were entitled to receive outstanding remuneration worth almost 2 million euros ($2.65 million) combined, in addition to getting their jobs back. Three traders submitted quotes for Euro Interbank Offered Rates, or Euribor, and one for Swiss Franc London Interbank Offered Rates.

In February, the bank had suspended five money-market traders in Frankfurt, after an internal probe into potential manipulation of benchmark interbank lending rates. The employees were dismissed and their unvested compensation was clawed back. One of the five individuals reached a settlement with the bank, but the other four sued the bank for reinstatement of their contracts.

In addition to the five, the bank had in 2011 suspended two traders suspected of manipulating the London interbank offered rate, known as Libor.

Within the next month, European Union regulators are expected to announce hefty fines against six global banks, including Deutsche Bank, related to alleged attempts to rig benchmark interest rates such as Libor and Euribor, industry officials briefed on the discussions told The Wall Street Journal earlier this month.

A Deutsche Bank spokesman pointed to the bank's latest quarterly report for comment on the Journal article. In the report, released at the end of October, Deutsche Bank says it has received subpoenas and requests for information from regulators in Europe, North America and Asia Pacific regarding probes into alleged manipulation of benchmark rates. The bank is cooperating with the investigations, which could result in significant financial penalties and other consequences, it says.

Since June 2012, U.S. and U.K. regulators have fined five financial institutions--Barclays PLC (BCS), UBS AG (UBS), Royal Bank of Scotland Group PLC (RBS), ICAP PLC (IAP.LN) and Rabobank--for a total of more than $3.5 billion related to the alleged manipulation of benchmark interbank lending rates.

Contracts and loans worth trillions of euros are based on benchmark interbank lending rates.

--David Enrich contributed to this article.

Write to Ulrike Dauer at ulrike.dauer@wsj.com; Twitter: @UlrikeDauer_

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