Callamus

Callamus is a boutique cross-border tax and corporate advisory firm serving internationally active individuals, entrepreneurs, and families.

Financial Services

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Headquarters: Kifisia, GreeceSource: RevenueBaseRetrieved October 13, 2026
Employee range: 1 to 10Source: RevenueBaseRetrieved October 13, 2026
Founded: 2009Source: RevenueBaseRetrieved October 13, 2026
Published list appearances: 5 supported appearances ↗Source: RevenueBase lists

The company at a glance

What does Callamus do?

The firm guides clients through international tax, corporate law, and wealth succession. Callamus states its aim is to help ensure clients’ personal financial and corporate structures remain legally and tax compliant, strategically efficient, and future-proof.

Based on the company’s public LinkedIn information, supplied through RevenueBase.

Explore the business in context

Snapshot: September 26, 2026

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Callamus

#9 Expat tax law firms

Snapshot: September 27, 2026

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Sources & data notes.

RevenueBase prepared this profile from the company’s public LinkedIn information and RevenueBase company data. These source records were retrieved on October 13, 2026. AI helped summarize these sources, with a separate automated check against the source text completed on November 4, 2026. Directory positions use company-contact counts from separate saved list snapshots dated September 18, 2026, September 19, 2026, September 26, 2026 and September 27, 2026. How the company lists are built.

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