VinFast Rally Exposes Valuation Risk Amid Deepening Losses

What happened

VinFast Auto shares recently surged on a Q4 revenue beat, as noted in a Seeking Alpha article. However, the DeepValue master report reveals gross margins deteriorated from -41.1% in Q2-2025 to -56.2% in Q3-2025, with net losses near $1 billion per quarter. This rally has pushed VinFast's valuation above non-Tesla peers, ignoring persistent cash burn and reliance on related-party sales, which comprised ~26% of deliveries in Q3-2025. Liquidity remains thin with significant dependence on Vingroup backstops, and governance weaknesses persist, including ineffective internal controls. Investors must scrutinize whether volume growth can translate into profitability, as current economics are unsustainable without external funding.

Implication

The recent surge in VinFast's stock price is disconnected from its fundamentally weak unit economics, with gross margins deeply negative and worsening. High related-party volume indicates demand quality issues, masking true consumer pull-through and increasing ecosystem reliance. Funding dependencies on Vingroup backstops introduce covenant and dilution risks, exacerbated by thin cash reserves. Without a clear gross-margin inflection and reduced related-party mix in the next 1-2 quarters, the equity is vulnerable to significant downside. Long-term, the stock only becomes attractive if VinFast demonstrates sustainable profitability and reduced external funding needs, which current data does not support.

Thesis delta

The rally does not alter the core 'POTENTIAL SELL' thesis; instead, it heightens valuation concerns by pricing in volume growth while ignoring deteriorating fundamentals. Key watchpoints remain unchanged: gross margin must inflect from negative levels, and related-party sales must decline to avoid dilution and funding crises.