By Maarten van Tartwijk

AMSTERDAM--Dutch insurer Aegon NV Thursday posted a 60% fall in net profit for the fourth quarter due to hedging losses, but said that its operating performance had improved.

Aegon, the owner of U.S. insurer Transamerica, reported net profit of 174 million euros ($239 million) for the final months of 2013, compared to EUR431 million in the same period a year earlier.

The bottom line was hit by hedging losses as a result of rising equity markets and interest rates, Aegon said.

Underlying pretax profit, which is seen as a better measure of Aegon's operational performance, rose 7% to EUR491 million, helped by a growth in business, investment gains and one-off charges.

Write to Maarten van Tartwijk at maarten.vantartwijk@wsj.com

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