Title: Robinhood Delays UK Launch Indefinitely While Alkami Surges in Market Debut Amid Nvidia's Fall

Content: Robinhood, a prominent U.S.-based stock trading app, has announced an indefinite postponement of its UK launch, opting to refocus on its domestic market after more than a year and a half of preparation. Meanwhile, Alkami Technology Inc enjoys a successful U.S. stock market debut, with shares jumping 38%, valuing the company at over $3 billion. In contrast, Nvidia faces challenges, losing about half of its value in the last two months, partly attributed to a "crypto hangover." These developments highlight significant movements and strategic shifts within the financial and technology sectors.

Subtopics:
- Robinhood's indefinite postponement of its UK market entry
- Alkami Technology Inc's successful stock market debut and valuation
- The challenges faced by Nvidia, including its significant drop in value