Spear’s Review 

Mike Tiedemann is the CEO of the publicly listed multi-family office (MFO) AlTi Tiedemann Global. As of July 2025, the firm had $88 billion in assets under management or advice.

In recent years, growth has been prodigious – powered by a spate of mergers and acquisitions activity. Notable moves include a SPAC-powered merger with British MFO Alvarium (which had been backed by Qatar’s ruling al-Thani family), which saw the newly created entity move onto the public markets. Now listed on the Nasdaq, its market cap as of October 2025 was around $560 million.

In 2024 the company acquired the US-based MFO Envoi, adding a further $3 billion in assets. In 2025 it scooped up another $15 billion in assets through its acquisition of the German MFO Kontora.

In a recent interview with Spear’s, Tiedemann said that the business he leads has been ‘very intentional’ about using its scale ‘to lower the cost of delivery of investments and services to our clients’.

Earlier in his career, Tiedemann lived and worked in Brazil as part of the equity research group at Banco Garantia. After the business was acquired by Credit Suisse, he led equity sales and trading operations for Latin America. 

More than 30 years ago he set up River Fund, a nonprofit that provides food, education and support services to help families in New York City break the cycle of poverty.

Read next: Mike Tiedemann: CEO of $88bn MFO Alti Tiedemann on growth, AI and the strength of institutions