The firm is now accepting and sending re-registration requests with other participating providers.
Alliance Trust Savings completed a detailed training and testing programme beforehand to ensure it was able to operate with other providers.
Altus plans to expand the service available to include re-registration of pension assets.
Elaine Maddison, proposition and service director at Alliance Trust Savings, said: "The ability to re-register assets electronically will bring benefits to platforms, fund managers, clients and advisers. Clients and advisers can choose a platform that best suits their needs without the worry of being out of the market if they decide to transfer.
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"However, efficient end to end registrations that take only 5-6 days to complete will only become a reality for all clients when more platforms and fund managers support the market practice."
She said that if a provider was not yet offering an online solution, Alliance Trust Savings would offer an offline service to ensure there was no consumer detriment.
Ben Cocks, product director at Altus, said: "Alliance Trust Savings has been at the forefront in getting automated transfers up and running so quickly and effectively.
"Given the breadth of the Alliance Trust Savings proposition, I think we are also seeing the start of the next phase of the transfer initiative with direct to consumer platforms and pension administrators also wanting to offer their consumers a better level of service."

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