Ten of the 17 Iowa-based companies on the Business Record's Iowa Index posted stock price gains for the month of May. Only one company posted double-digit percentage gains. Seven Iowa-based stocks posted losses.

Renewable Energy Group Inc. had the largest gain of the month with a 10.00% increase. Meredith Corp. had the second-biggest gain at 8.30%. HNI Corp. had the third-biggest with a 7.75% increase.

Winnebago Industries Inc. posted the biggest percentage loss at 7.49%. Lee Enterprises Inc. had the second-biggest loss with a 2.64% decrease. Heartland Express Inc. was third with a 2.37% decrease.

Farm Bureau Property & Casualty Insurance Co. on May 25 announced that it has completed its transaction with FBL Financial Group Inc. that takes the company private. As a result of the closing, FBL Financial Group common stock will no longer trade on the New York Stock Exchange prior to the opening of the market on May 26. Read more about the transaction. FBL Financial Group will no longer be included in our Iowa Index.

The Iowa Index, an unweighted average price of 17 Iowa-based public companies, increased 0.53% in May, compared with a 1.53% decrease in the Nasdaq stock index and a 1.93% increase in the Dow Jones Industrial Average.

The Iowa-based companies that make up the Iowa Index are in bold in this list of companies with sizable operations in the state.

See the full Iowa Index