** Medical equipment maker TransMedics' TMDX.O shares rise 4.4% to $75 premarket
** Co's Q4 revenue of $121.6 million beats analysts' average expectation of $110.3 million, according to data compiled by LSEG
** TMDX forecasts annual revenue between $530 mln and $552 mln, the midpoint of which is above analysts' average estimate of $539 mln - LSEG
** Up to last close, stock down 18.7% in the last 12 months
(Reporting by Christy Santhosh)
((Christy.Santhosh@thomsonreuters.com))