Jankowski said he anticipates negative cash flow through 2017, which could "prompt [GoPro] to tap its credit facility." Last Friday, Citi Research initiated coverage on GoPro with a sell rating, saying the technology company will continue to lose money the next two years and disappoint investors. With Monday's losses, the stock has fallen more than 40 percent over the past six months, compared to the S&P 500's more than 8-percent gain. GoPro went public in June 2014 at $24 a share, and the stock peaked late that year above $98 a share.