Abacus Worldwide has added a US firm and expanded its association to Singapore.

In the US, Abacus has added ZBS Group, based in Plainview, New York state.

The firm offers audit, tax planning, advisory and valuation services. It has two partners.

In Singapore, Abacus has added Acutus, its first firm in the country. The firm was originally founded in 1987 under the name SP Tan & Co but rebranded.

It provides audit and tax services, consulting and advisory, outsourcing and corporate services.

The firm has a second office in Hong Kong, where Abacus is also represented by the STL Alliance.

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