Patent litigation soared in 2015, and nearly 44 percent of the year’s new lawsuits were filed in the Eastern District of Texas, legal analytics company Lex Machina reported Thursday.

In a blog post that covers 2015 trends seen in different types of intellectual property, the company reported that patent litigation in U.S. district courts rose 15 percent from 2014, with 5,828 new cases filed. With the exception of 2013, when a record 6,114 patent suits were filed, 2015 surpassed all previous years.