The Short Version
Acecook Vietnam does hold the top position in Vietnam's instant noodle market, with approximately 40–40.7% market share in 2024–2025—well ahead of second-place Masan Consumer at roughly 27%. Multiple credible, independent sources confirm this leadership across unit volume and retail store share. However, the unqualified "leading" label omits important context: Acecook's share has declined significantly from a historical peak of ~70%, and Masan has been steadily gaining ground, making the competitive landscape more contested than the claim implies.