SoundHound AI ($SOUN), a company specializing in voice AI technologies, reported a record quarter with an 80% revenue growth in Q4, reaching $17.1 million. This growth was accompanied by an 80% improvement in adjusted EBITDA year-over-year. Despite this, the company experienced a significant stock rally cooling after its earnings were released, with shares slumping as much as 25% following a disappointing quarter that tempered the rally. The company had seen a 600% increase in its stock price over the month leading up to the earnings announcement. However, it was noted that the Q3 revenue growth of 19% included a one-time revenue recognition from a contract modification with a Korean customer, likely Hyundai, which, if excluded, would have seen a revenue decline of 29% year-over-year in Q3. Speculations arose whether Nvidia might be a customer, amid the earnings miss that led to a sharp decline in SoundHound AI's stock, with a 20.6% drop in pre-market trading.