According to CoreLogic, 6.5% of U.S. sales in the fourth quarter of 2018 were flips. Unfortunately, fourth quarter losses for flippers who sold within a year were the highest since 2009.
With hard money loan interest rates from the likes of Blackstone Group LP and Goldman Sachs Group Inc. typically running around 10% as a minimum, this could be a leading indicator to watch in the next year.
https://magazine.realtor/daily-news/2019/05/10/hgtv-inspired-flippers-get-harsh-dose-of-reality
https://www.nytimes.com/2018/06/15/realestate/for-house-flippers-reality-meets-reality-tv.html