What do these big corporations—Amazon, CostCo, NIKE, Google, Occidental Petroleum, Qualcomm, Berkshire Hathaway, Devon Energy, Walgreen, Halliburton, Walmart, Caterpillar, Allstate, Bank of America, Lowe’s, Sunoco, Mastercard and CVS Caremark—all have in common?

These are the most secretive, least transparent corporations when it comes to revealing their spending on electioneering, even though they are all publicly traded and have received more than a $1.3 billion in federal contracts since 2010. And they are not about to change.