** Shares of networking and communications provider, Adtran Holdings ADTN.O fall 10.65% to
$13.5 in premarket trading following prelim Q1 results
** For Q1, co sees rev between $322 mln and $326 mln; below its previous outlook of $355 mln
to $375 mln
** Analysts expect $364.1 mln in Q1 rev- Refinitiv IBES data
** Customer inventory corrections impacted Subscriber Solutions product line, supply
constraints prevented us from meeting customer demand across all categories- co says
** Co sees resulting Q1 prelim GAAP operating margin between -14% and -17%
** Up to last close, stock had fallen 19.6% YTD
(Reporting by Khushi Singh)
((Khushi.Singh@thomsonreuters.com;))