About $1.5 billion was wiped off a2 Milk's market capitalisation after the company said its first-half revenue would drop because level 4 restrictions in Melbourne had affected its unofficial "daigou" sales.
After an hour of trading, a2 Milk's shares were down $2.09 or 11.3 per cent at $16.35, taking its market cap to $12.14 billion from $13.7b.
A2 Milk, in an earnings update, said it expected first-half sales to come to $725 million to $775m, down from $805.3m in the previous corresponding period.
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The company expects to see a better second half, forecasting its annual group revenue to come in at $1.80 billion to $1.90b for the current year, up from $1.73b in 2021.