While there is no comprehensive list of companies using popcorn as packing or packaging material, there are companies around the world taking advantage of this greener alternative to traditional packing material. According to Hippy Shopper, the British cosmetic's company Lush is one such example of a company who makes use of popcorn as packing or packaging material.

Companies around the world that ship goods from their facilities use all different sorts of packing materials to protect their products during shipping. There are different forms of bubble wrap, foam packing pellets or peanuts, and popcorn. Yes, actual popcorn.
The white, fluffy popcorn you enjoy at the movies or on your own couch is also used around the world as packing material. In fact, Hippy Shopper indicates that the United States military began using popcorn back in World War II to protect different electrical instruments when they shipped from the U.S. bases to their needed positions on foreign soil.
Today, there are still thousands of shipping companies that use the material as one of, or even as their primary source, of packing protection.
The reason for using popcorn is mainly because, while popcorn provides sufficient cushion for a number of different products, it’s also biodegradable. This means that it won’t take up space in a landfill for years and years since it is able to break down and become inert material in a matter of months. Also, popcorn is one of the most inexpensive methods of producing packing material, and the cost of making the material is lower than any other form of packing material supply. Quite literally, all a small company needs to produce sufficient packing material is a stove and a kettle.