London — When prosecutors knew about possible links between a former Citigroup banker and a wealthy businessman will be one of the issues reviewed during an appeal in the UK’s highest-profile insider-trading case.

Walid Choucair, a day trader, and Fabiana Abdel-Malek, a former UBS Group compliance officer, won the right to appeal on grounds that a potentially important alternative source of information on a series of mergers and acquisitions may have been wrongly withheld, according to people familiar with the matter. It’s one of seven grounds that were accepted for argument by the court of appeal...

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