U.S. stock market update: Applied Optoelectronics Inc. down 7.00%

U.S. Stock Market Midday Update

Stocks with High Trading Volume in the Industry

Arista Networks fell 2.37%. Based on recent key news:

1. On September 13, Arista Networks announced better-than-expected guidance during its analyst day event, but the stock still dropped 9%. Although analysts and investors were satisfied with the company's business updates, the market remained cautious about its revenue targets for 2026 and AI-related guidance, leading to the stock's decline.

2. On September 13, despite Goldman Sachs and other institutions raising Arista's target price, concerns about its growth trends persisted in the market. Goldman Sachs raised the target price from $155 to $175, but investor worries about the growth trend in 2025 affected stock performance.

3. On September 16, a report from MarketBeat indicated that although Arista Networks was rated as a moderate buy, top analysts were more optimistic about five other stocks, which may have impacted investor confidence in Arista. The tech industry faces risks of slowing growth.

Cisco fell 0.66%, with a trading volume of $296 million, showing increased activity. Based on recent key news:

1. On September 15, Cisco Systems' Executive Vice President Thimaya K. Subaiya reported the sale of company common stock. This news raised market concerns about insider confidence in the company, leading to a drop in stock price.

2. On September 16, Cisco announced the implementation of post-quantum cryptography (PQC) NIST standards in its product portfolio to address future quantum threats. Although this news is favorable for the company's long-term development, it failed to boost the stock price in the short term.

3. On September 16, Cisco will host the WebexOne 2025 conference to showcase its innovations in artificial intelligence, cloud computing, and quantum technology. Although this event attracted market attention, it did not immediately have a positive impact on the stock price. The tech industry has shown recent volatility, requiring attention to macroeconomic data.

Lumentum Holdings rose 0.04%. Based on recent key news:

1. On September 15, Lumentum Holdings achieved an annualized return of 18.28% over the past five years, outperforming the market by 3.43%. This long-term strong performance boosted market confidence, driving the stock price up. Data source: Benzinga. Market confidence in long-term returns has strengthened.

Stocks with High Market Capitalization in the Industry

Motorola Solutions fell 0.77%. Based on recent key news:

1. On September 15, Motorola Solutions reached a cooperation agreement with the State Service for Special Communications and Information Security of the Republic of Azerbaijan (SCISSS) to upgrade its TETRA radio system. This collaboration indicates Motorola's strategic position in global communication infrastructure, leading to stock price fluctuations

2. On September 13, Motorola Solutions Chairman and CEO Gregory Q. Brown sold 50,000 shares of stock, totaling $24,280,179. Additionally, Senior Vice President and General Counsel James A. Niewiara also sold 1,700 shares, valued at $825,214. The stock sales by these executives raised concerns in the market about internal confidence in the company, leading to stock price fluctuations.

3. On September 13, Motorola Solutions' strong financial performance and positive earnings conference call were considered the most important factors driving the overall rating. Although technical indicators show bullish momentum, caution is advised due to potential overbought conditions. The communications industry is performing strongly, but there is a need to be wary of overvaluation risks