Citigroup will be the first major Wall Street institution to enforce a vaccine mandate by terminating noncompliant workers by the end of this month.

The bank reminded employees in a memo sent Friday about its policy, first disclosed in October, that they must be “fully vaccinated as a condition of employment.” At the time, the bank said that employees had to submit proof of vaccination by Jan. 14.

Those who haven’t complied by next week will be put on unpaid leave, with their last day of employment being Jan. 31, according to the memo, which was first reported by Bloomberg. A spokeswoman for the New York-based bank declined to comment.

Citigroup, the third biggest U.S. bank by assets and a major player in fixed income markets, has had the most aggressive vaccine policy among Wall Street firms. Rival banks including JPMorgan Chase and Goldman Sachs have so far stopped short of terminating unvaccinated employees.

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