financial regulator
US /faɪˈnæn.ʃəl ˈreɡ.jə.leɪ.t̬ər/
UK /faɪˈnæn.ʃəl ˈreɡ.jə.leɪ.t̬ər/

1.
a government agency or other organization responsible for overseeing and enforcing rules and regulations within the financial industry to ensure stability, fairness, and consumer protection
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The new policies were introduced by the financial regulator to prevent market manipulation.
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The bank is currently under investigation by the financial regulator.