As a buyer, tracking the behaviors of sellers, both in aggregate and individually, allows you to operationalize your buying activities. This is especially true for repeat sellers, who account for 41% of the transactions for patent packages listed in calendar years 2017 and 2018. Knowing who the regular sellers are, often companies with a large portfolio, allows you to contact sellers to create a private deal. Keeping track of a seller’s listings, package sizes, and asking prices can also help you in negotiations because you know their negotiation parameters at the outset. Similarly, if you are a seller, it is important to get out the word that you are selling. Listing packages on your website, through the IAM Market, or working with brokers attracts buyers to you rather than you having to spend the time and effort to find them. For the analysis of current sellers and buyers we looked at all of the packages that sold between January 1, 2017 and May 31, 2018 (assignments were last checked on August 15, 2018) regardless of their listing date. Sales continue to be made mostly by operating companies, which is not surprising as they file the majority of patents. Operating companies were the sellers in 67% of transactions. This is remarkably consistent, at 66% in the previous two papers.