If 2016 proved that all sectors of the U.S. economy were subject to cyberattacks, 2017 was the year this point hit home. The year was marked by some of the biggest enterprise breaches ever experienced in the U.S., not to mention a fair share of incidents connected to the compromise of third party vendors. What's more, a few were made worse because of cover ups and delayed notifications. Enterprise cybersecurity and the management of cyber risk has a long way to go in 2018. Hopefully, this year's seemingly endless stream of breaches has provided a wake-up call for many to get into shape in the near future. Here's a look at eight of the most significant enterprise breaches of 2017.