Wall Street Zen cut shares of Atomera (NASDAQ:ATOM – Free Report) from a hold rating to a sell rating in a report published on Saturday. Separately, Weiss Ratings reaffirmed a “sell (e+)” rating on shares of Atomera in a research report on Friday, May 15th. One analyst has rated the stock with a Sell rating, Based on data from MarketBeat.com, the stock has an average rating of “Sell”. Vanguard Group Inc. now owns 1,635,938 shares of the technology company’s stock valued at $7,231,000 after purchasing an additional 15,450 shares during the period. Hollencrest Capital Management now owns 606,546 shares of the technology company’s stock valued at $1,340,000 after buying an additional 7,179 shares during the period.