** Shares of medical device maker Nuwellis NUWE.O rise 7.75% to $1.39

** Co posts Q4 net sales of $2.4 million, compared to analysts' estimate of $2.3 million, according to data compiled by LSEG

** Q4 loss narrows to $1.50 per share from $18.30 a year earlier. Analysts had expected a loss of $1.56 per share

** NUWE says revenue increase was driven by higher U.S. device sales, better pricing and a non-recurring rise in international sales

** NUWE shares were down over 96% in 2025