Investment assets and client money will be brought into scope of the Financial Conduct Authrity's Dormant Assets Scheme.
The regulator said the expansion of the scheme could unlock a further £880mn from dormant accounts.
Since the scheme was set up in 2011 it has unlocked more than £745mn for social and environment initiatives, from more than £1.35bn in dormant bank and building society accounts.
The first phase of the expansion, which covered insurance, pensions, and securities, was completed in August 2022.
The FCA said: "Led by industry and backed by government, the Dormant Asset Scheme aims to reunite people with their financial assets.
"Where that is not possible, this money supports UK growth through good causes such as getting young people into work or offering affordable credit to families."
The regulator has published a policy statement which outlines technical changes to its handbook to enable the expansion of the scheme to the other asset classes.
It added: "The FCA’s intention is to ensure any Handbook changes allow firms to participate in the Dormant Assets Scheme and consumers to access reclaims."
tara.o'connor@ft.com
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