OMAHA — Ag Processing Inc. says it has sold subsidiary AGP Grain to Columbia Grain of Portland, Ore., for an undisclosed price.

The sale includes the soybean co-op’s assets in Minnesota and North Dakota. But the Omaha-based company will continue service to producers in Nebraska, Texas, Iowa and Kansas.

AGP represents more than 250,000 farmers in the United States and is a major vegetable oil refiner.

The co-op recently rejected unsolicited takeover bids from an Omaha investment bank, which said the co-op would have an easier time soliciting outside investments if it were sold and restructured as a corporation.