An improvement in fees collected for trust and investment services at Northern Trust contributed to an increase in first-quarter profit.

The Chicago custody bank said Tuesday that its net income rose 5% to $232 million from a year earlier. Earnings per share rose 7% to $1.01. Revenue rose 5% to $1.2 billion.

Assets under custody rose 2% to $6.2 trillion, while assets under management fell 6% to $900 billion. Corporate and institutional services, the largest segment of assets under management, fell 8% to $670 billion.

Noninterest income rose 1% to $882 million. Trust, investment and servicing fees — the biggest segment of fee income for Northern Trust — rose 3% to $748 billion. Foreign-exchange trading income fell 15% to $61 million.

Net interest income rose 18% to $308 million because of an increase in earning assets and a higher net interest margin.

Noninterest expense rose 5% to $829 million, largely because of higher salaries and outside services.

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