---
title: "U.S. stock market midday update: Nebius down 12.73%! Insider selling triggers a crisis of market confidence, increasing valuation risks"
type: "News"
locale: "en"
url: "https://longbridge.com/en/news/286807143.md"
description: "Nebius fell 12.73%; Microsoft rose 0.42%, with a transaction volume of USD 8.471 billion; Now Services rose 8.95%, with a transaction volume of USD 3.864 billion; Oracle fell 4.46%, with a transaction volume of USD 2.55 billion; Palo Alto Networks rose 1.55%, with a market value of USD 200 billion"
datetime: "2026-05-18T18:27:57.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/286807143.md)
  - [en](https://longbridge.com/en/news/286807143.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/286807143.md)
---

# U.S. stock market midday update: Nebius down 12.73%! Insider selling triggers a crisis of market confidence, increasing valuation risks

**U.S. Stock Market Midday Update**

Nebius fell 12.73%, with increased trading volume. Based on recent key news:

1.  On May 18, Nebius Group's annualized return over the past decade was 26.23%, but the recent sharp decline in stock price has raised concerns about its valuation, leading to a 12.73% drop in stock price.
    
2.  On May 17, Citibank raised Nebius's target stock price to $287. Despite exceeding performance expectations, the market still has doubts about its short-term valuation, causing the stock price to drop 2.8% in pre-market trading.
    
3.  On May 16, Nebius's Chief Infrastructure Officer Andrey Korolenko sold 500,000 shares of company stock, worth over $100 million, raising concerns in the market about insider confidence and further pressuring the stock price. Demand for AI servers is strong, increasing market attention.
    

**Stocks with High Trading Volume in the Industry**

Microsoft rose 0.42%, with increased trading volume. Based on recent key news:

1.  On May 16, Whale Rock Capital Management established a new position in Microsoft, reflecting a strategic shift from hardware infrastructure to software applications and services. This move boosted market confidence in Microsoft's position in the AI sector, driving the stock price up.
    
2.  On May 16, Bill Ackman stated that Pershing Square established a new position in Microsoft, claiming that its 365 product suite and Azure cloud services are the two most valuable business segments in enterprise technology. This news boosted investor confidence, leading to a 2.9% increase in stock price.
    
3.  On May 17, Wall Street Journal reported that Hohn and Ackman had differing views on the relationship between AI and the existing software ecosystem. Ackman believes that AI will enhance Microsoft's platform, making it one of the biggest beneficiaries of the AI wave. This news led to a 3.05% increase in Microsoft's stock price for the week. Technology stock positions are being adjusted, and AI investment is entering a new phase.
    

ServiceNow rose 8.95%. Based on recent key news:

1.  On May 18, Bank of America Global Research resumed coverage of ServiceNow with a buy rating and set a target price of $130, indicating about a 37% upside from last Friday's closing price. This news drove the stock price up by 8.6%. Source: Reuters
    
2.  On May 18, ServiceNow successfully issued $4 billion in senior unsecured bonds to refinance its bridge loan for the acquisition of Armis Security. The bond issuance attracted over $38 billion in orders from institutional investors, showing strong market interest. Source: Zhitong Finance
    
3.  On May 18, ServiceNow announced the cancellation of the automatic stock sale plan for executives and authorized an additional $5 billion stock buyback, with an immediate $2 billion accelerated repurchase. This move enhanced market confidence in the company's future performance Source: Wall Street Watch The software industry is significantly affected by AI, with noticeable capital inflows.
    

Oracle fell 4.46%. Based on recent key news:

1.  On May 16, Wedbush raised Oracle's target price from $225 to $275 due to its strong momentum in AI infrastructure, with a record backlog of $553 billion. AI-related profit margins and multi-cloud partnerships have enhanced profitability and investor confidence.
    
2.  On May 16, Oracle's cloud infrastructure revenue grew 84% year-on-year, with AI-related profit margins and multi-cloud partnerships boosting profitability and investor confidence. Analysts are optimistic about its profitability.
    
3.  On May 16, Oracle's role in defense technology was strengthened, as the U.S. Department of Defense plans to use Oracle's AI capabilities in secure networks to improve data analysis, situational awareness, and real-time decision-making. AI infrastructure is experiencing strong growth, attracting high market attention.
    

**Stocks ranked among the top in industry market capitalization**

Palo Alto Networks rose 1.55%. Based on recent key news:

1.  On May 12, Palo Alto Networks launched the Idira platform, driving up the stock price. The platform integrates CyberArk capabilities, providing AI-driven risk discovery features, and the market reacted positively, with the stock price rising consecutively.
    
2.  On May 16, Morgan Stanley and other institutions raised their target prices and maintained an overweight rating. Analysts believe that the expansion of identity security business will accelerate spending growth, benefiting the stock price.
    
3.  On May 18, the acquisition of Portkey strengthened AI security layout. Despite high price-to-earnings ratios, the market is focused on the upcoming financial report to verify the sustainability of growth. The cybersecurity industry is increasingly affected by AI threats

### Related Stocks

- [NBIS.US](https://longbridge.com/en/quote/NBIS.US.md)
- [MSFT.US](https://longbridge.com/en/quote/MSFT.US.md)
- [NOW.US](https://longbridge.com/en/quote/NOW.US.md)
- [ORCL.US](https://longbridge.com/en/quote/ORCL.US.md)
- [PANW.US](https://longbridge.com/en/quote/PANW.US.md)

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