Semtech rises after fourth-quarter results beat
** Semiconductor company and cloud services provider Semtech's SMTC.O shares rise 12.5% to $36.80 premarket ** Company on Thursday reported Q4 revenue of $251 million vs est $249.2 million, according to data compiled by LSEG ** SMTC reported Q4 adj profit of 40 cents/shr vs est 32 cents/shr ** Company's shares up 41.3% in past 12 months (Reporting by Padmanabhan Ananthan) ((padmanabhan.ananthan@thomsonreuters.com))