Administrator
From ACT Wiki
1. UK pensions.
The person notified to HMRC as being responsible for the management of a pension scheme.
2. UK insolvency.
Loosely, an Administrative Receiver.
3. Other organisations.
More generally, a person responsible for day to day administration, in any type of organisation.
4. Organisations - interest rate benchmarks.
An organisation with responsibilities for calculation and publication of key market data, such as an interest rate benchmark.
For example, CME Group is the administrator for Term SOFR,