** Shares of New Zealand's a2 Milk ATM.NZ poised for a weekly loss of ~18%, their biggest drop since August 2024
** Stock falls as much as 0.9% to NZ$9.15 on the day
** Shares of dairy producer plunged more than 12% on Monday after co cut its fiscal 2026 profit guidance
** Co expects FY2026 NPAT to be broadly in line or below NZ$202.9 mln ($119.37 mln) reported in FY2025
** Cuts FY revenue growth guidance to low- to mid-double-digit range from a mid-double-digit outlook
** Says temporary supply chain disruptions have constrained availability of its China-label infant milk formula in the fourth quarter, mainly in April and May
** Stock down 14.6% YTD
($1 = 1.6998 New Zealand dollars)
(Reporting by Sneha Kumar in Bengaluru)
((Sneha.kumar@thomsonreuters.com;))