Nvidia's (NVDA 5.79%) GTC 2025 conference is less than a week away, and investors are anticipating a catalyst for its struggling stock could be coming. That optimism helped shares jump as much as 7.4% today.Even so, Nvidia shares have lost more than 15% so far this year, and are nearly 24% off an early January high. However, a new analyst message today has helped investors feel more comfortable buying back in. As of 11:33 a.m. ET, the stock was holding on to a 5.4% gain.Mixed bag of newsOngoing tariff news ...