** Tata Motors TATM.NS drops about 2% to 315.7 rupees
** India's top commercial vehicles maker reports quarterly loss on one-time charge, excluding which, profit up 57% Y/Y
** Tax cuts, festive buying boost earnings; co also forecast high single-digit pct growth in demand in H2 vs about 3% sales growth in H1
** However, analysts flag market share loss across segments
** Market share loss in light CVs from a high of 40% in FY22 to an all-time low of 27% at present is "particularly worrisome," says Motilal Oswal
** Nuvama expects medium-to-heavy commercial vehicles market share to drop to 45.7% by FY28 from 46.4% in FY25 on increasing competition
** Stock down 5.9% since trading debut on Wednesday
(Reporting by Kashish Tandon in Bengaluru)
((Kashish.tandon@thomsonreuters.com))