Brokerage giant Nomura Holdings Inc. said Friday its group pretax profits for the April-June quarter plunged 65.3 percent from a year earlier to 18.37 billion yen.

Nomura attributed the decline to a drop in stock brokerage commissions.

Although group net profits rose 350.8 percent to 117.85 billion yen, the gains came mostly through accounting method revisions, Nomura said.