In this presidential election year, shareholders are increasingly curious about the political agendas of public companies. Investors filed more than 100 resolutions this year asking companies to disclose what they spend on political advocacy, according to Institutional Shareholder Services, a proxy advisory service. The number of proposals for the first time exceeded shareholder resolutions on energy and environmental issues, which have long attracted significant interest from investors. Shareholders want to know about direct donations to candidates as well as harder-to-track contributions to trade associations such as the U.S. Chamber of Commerce and other tax-exempt groups that support certain candidates or political parties. Their targets include influential Illinois companies Boeing Co., Allstate Corp. and Caterpillar Inc. All three companies came out against the proposals.