Analyst Laura Martin of Needham & Co. has lowered her rating for Netflix from buy to hold following the vote by Britain to exit the European Union. In a research note Tuesday, Martin said she also lowered her earnings estimates for the second half of the year for the streaming video giant because Brexit "adds fundamental risks that decelerating GDP growth in the U.K. and E.U over the next 12-24 months will accelerate churn of Netflix subscribers (cancelable at any time), or slow subscriber growth."