In May 2020, after releasing partial and non-peer reviewed results for only 8 of 45 candidates in a preliminary pre-Phase 1 stage human trial direct to stock markets, the CEO announced on CNBC an immediate $1.25 billion rights issue to raise funds for the company, at a $30 billion valuation.

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How do you read " $30 billion valuation"?
1. thirty billion dollar valuation
2. thirty billion dollars valuation

#2

Even though 30 billion is clearly plural, in this phrasing, the word billion is usually pronounced in the singular.