Why did RTC surge?

The deep research logic is organized as follows: 

Okay, let's tackle why RTC (Baijiayun Group) surged. First, I need to look at the references provided. The user is asking for the reasons behind the stock's sudden increase. 

Starting with the pre-market and post-market percentage changes from Reference 1, RTC had a 61.91% pre-market jump and 2.7% post-market. That's a significant spike. Then, looking at the recent two weeks' performance in Reference 2, the stock had a 72.09% change on 2025-04-17, which aligns with the pre-market surge. 

References 3, 4, 6, and 7 all mention a strategic AI collaboration with Xinlantian Education Technology. This partnership aims to develop an AI-driven platform for autistic children's rehabilitation. The announcement likely triggered positive retail sentiment, as noted in Reference 3, where Stocktwits sentiment soared to 'extremely bullish' with high message volume. Retail investors often react quickly to such news, driving up the stock price.

Additionally, the stock's price history is crucial. Reference 5 and others mention that RTC is facing a potential Nasdaq delisting due to its stock trading below $1 for 30 consecutive days. However, the company appealed, with a hearing scheduled for April 24, 2025. The surge might be a short-term reaction to the announcement, hoping the collaboration will boost the company's prospects and help it avoid delisting.

The broader market context from References 8, 9, and 10 shows increased volatility and uncertainty due to potential tariffs and economic concerns. However, RTC's specific catalyst (the AI partnership) provided a positive narrative amidst broader market turbulence, attracting traders looking for high-risk, high-reward opportunities.

Also, considering the user's interest in the NASDAQ Composite and short-term strategies, the surge aligns with a news-driven, high-risk approach. The stock's nano-cap status (Reference 3) means it's more susceptible to retail trading sentiment and smaller institutional moves.

Putting it all together, the surge is due to the AI collaboration announcement, retail sentiment, potential delisting avoidance hopes, and the company's focus on expanding into high-growth AI sectors. The combination of these factors, especially in a volatile market, explains the significant price movement.

**Concluding Statement:** Baijiayun Group (RTC) experienced a sharp surge on April 17, 2025, driven by a confluence of factors including a transformative AI-driven strategic partnership, retail investor sentiment, and short-term market dynamics. Below is the detailed analysis:

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### **1. Strategic AI Collaboration as the Catalyst**
The surge began after Baijiayun announced a partnership with Beijing Xinlantian Education Technology to develop an AI-powered platform for autistic children’s rehabilitation . Key points:
- **Technological Differentiation**: Baijiayun will leverage its AI video solutions (including large language models) to create personalized rehabilitation plans, real-time monitoring, and nationwide branch oversight .
- **