Tongyi Shares (300538) Limit-Up Analysis: Driven by Multiple Concepts and Market Attention

Tongyi Shares (300538)’s strong performance on November 18, 2025 (20% limit-up in 4 minutes [1]) was mainly driven by the following factors:

1. Polarizer Concept Sector Rotation
   : The polarizer concept sector rose by 1.94% [2] on that day, and the sector’s popularity spread to this stock;
2. Robot Concept Catalyst
   : The company’s ABS sheets and PA fiber-reinforced sheets can be used in robot and robot dog shells and internal structural parts, aligning with the market’s focus on robot themes;
3. Semiconductor Industry Chain Linkage
   : Against the backdrop of domestic substitution, the semiconductor equipment and materials sector has received attention, and this stock rose in linkage with lithography machine concept stocks;
4. Capital Inflow Support
   : On November 17, the main capital had a net inflow of 4.147 million yuan [0], indicating early positioning by funds;
5. Investor Relations Activity
   : The company will participate in the Beijing Area Listed Companies Investor Online Collective Reception Day on November 20, and the market expects more information disclosure.

In addition, the stock had a high turnover rate (21.24% [0]) on that day, reflecting investors’ strong interest in the stock and short-term trading activity.

• Cross-domain Concept Convergence
  : The three popular concepts of polarizer, robot, and semiconductor are concentrated in Tongyi Shares, reflecting the market’s preference for stocks with multi-theme attributes;
• Signal Significance of Rapid Limit-Up
  : The limit-up within 4 minutes indicates that the market reacted quickly to these themes, and funds have a strong willingness to chase related concept stocks;
• Dual Implications of High Turnover Rate
  : On one hand, it shows high capital participation; on the other hand, it also implies greater short-term volatility risks, and we need to be alert to profit-taking pressure.

• The sustained popularity of the polarizer, robot, and semiconductor sectors may provide subsequent upward momentum for this stock;
• The upcoming investor relations activity may release more positive information, further boosting market confidence;
• Under the trend of domestic substitution, the company’s related businesses are expected to receive dual support from policies and the market.

• High turnover rate means a high proportion of short-term trading funds; if market sentiment shifts, it may trigger a rapid correction;
• Concept speculation has phased characteristics; if the popularity of related sectors fades, the performance of this stock may be affected;
• We need to pay attention to whether the company’s fundamentals can support the sustained rise of the stock price, and avoid over-reliance on theme speculation.

The limit-up of Tongyi Shares (300538) is the result of the combined effect of multiple market factors, including sector rotation, theme catalysis, capital inflow, and event-driven factors. Investors should comprehensively consider the company’s fundamentals, sector trends, and market sentiment, view short-term stock price fluctuations rationally, and pay attention to risk control.