The DAO Multisig controls governance admin to the Balancer deployment on Ethereum. It also custodies any treasury assets across all chains that Balancer operates on or has financial agreements on.
The DAO Multisig has the following power delegated from BAL token holders as part of the subDAO formation proposal:
For a list of the current DAO Multisig addresses on the various blockchains it has a presence, please see this list.
In order to change a signer of the DAO Multisig, a governance vote is required. Please find a list of the current signers here.