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A Goldman Sachs partner who previously ran US stock trading has quit the investment bank and is set to join Credit Suisse, according to people familiar with the matter.

Matthew Mallgrave, who was named a partner at Goldman Sachs in 2010, quit in the past few days. He is in talks to join Credit Suisse as head of Americas cash equity trading, according to the people.

A Harvard graduate, Mallgrave was selected by the Toronto Maple Leafs in the 1988 NHL draft.

In his new role, he will work with Dan Mathisson, the head of Credit Suisse's US equity trading business.

Scott Lynch will remain head of Americas cash equity trading until Mallgrave joins, according to the people.

Equities businesses at the biggest banks have had a good year. The top 10 banks made $24.6 billion from equities sales and trading in the first half, according to data from Coalition, up 18% from the same period last year.

Credit Suisse is one of the leading players globally in the business, with strong positions in cash equities and future options, according to Coalition. It ranked joint third in both by revenues.

Its US business is smaller, however, ranking behind the big five US investment banks — Goldman Sachs, JPMorgan, Morgan Stanley, Bank of America Merrill Lynch, and Citigroup — and its European rival Deutsche Bank, according to the Coalition rankings.

The bank is expected to refocus and prioritize its most profitable units under new chief executive Tidjane Thiam. The bank is planning to give an update on its strategy on October 21.