Analysis of SuDaVig (300331)'s Strong Performance: A Lithography Machine Concept Stock Fueled by M&A Tailwinds

This analysis is based on multi-source information from Eastmoney.com, Securities Times Network, Display Times Network, Caifuhao, etc.[1][2][3][4][5], with reports published on January 15, 2026. Suzhou Su Da Vigor Technology Group Co., Ltd. (Stock Code: 300331) posted strong performance on the day, closing at RMB 46.01 with a 15.05% increase, approaching the daily limit, a turnover rate of 25.14%, and a turnover value of RMB 2.398 billion, hitting a recent record high. The company’s main business covers four business groups: public security and new 3D printing materials, consumer electronics new materials, high-end intelligent equipment, and reflective materials, and it operates in the hot tracks of lithography machines, semiconductor equipment, and micro-nano optics.

SuDaVig has recently received support from multiple substantive positive catalysts. On January 9, 2026, the company successfully completed the acquisition of 51% equity in Changzhou Weipu Semiconductor Equipment Co., Ltd. with a transaction value of RMB 510 million, and Changzhou Weipu officially became its holding subsidiary[1][3]. The target company’s STORM 5000 mask defect inspection equipment has passed commercial acceptance by a leading domestic customer, is compatible with ArF and KrF technology nodes, and has been delivered to leading customers such as SMIC Shanghai, DisMicro, AMEC Mask, and Luwei Optoelectronics[2]. This acquisition marks an important breakthrough for the company in the field of semiconductor inspection equipment.

On January 5, 2026, the company signed a “Strategic Cooperation Framework Agreement” with Shanghai Yudi Optoelectronics, focusing on the field of precision optical objectives and systems[4]. The core team of Yudi Optoelectronics comes from the Shanghai Institute of Optics and Fine Mechanics, and it focuses on precision optical objectives for semiconductor equipment and optical systems for satellite laser communication. The two parties agreed on multi-level cooperation such as priority procurement, investment, and M&A, which will further strengthen the company’s core technical capabilities in the lithography machine industry chain.

The lithography machine sector has shown an overall strong trend. According to industry analysis data, 9 companies in this sector have been heavily increased in holdings by institutions in the past month, and the sector has been continuously strong in the last 4 trading days, breaking through the medium-term box platform on Wednesday[5]. As the “exclusive supplier of nanoscale positioning gratings” with a scribing accuracy of ±1nm and significant technical barriers, SuDaVig has been included as a core target in the lithography machine industry chain[5]. The overall strength of the sector provides a favorable market environment support for individual stocks.

As of December 31, 2025, the number of the company’s shareholders was 34,507, a sharp decrease of 10,187 from the previous period, a drop of 29.6%[1]. The concentration of chips has increased significantly, suggesting that institutional funds may be building positions, providing a solid chip foundation for the stock price rise.

From a technical perspective, SuDaVig’s performance on the day showed typical characteristics of main capital attention. The closing price was RMB 46.01, with an increase of 15.05%, approaching the daily limit price of RMB 47.99, and the highest price reached RMB 47.50, with a large amplitude (from the lowest price of RMB 40.79 to the highest price of RMB 47.50), indicating fierce long-short games. The turnover rate of 25.14% is in a highly active state, and the volume ratio of 1.48 indicates that the trading volume has increased compared to recent periods, with high capital participation.

Notably, the capital flow on the day showed the characteristics of “main capital outflow and retail investors chasing gains”. The net outflow of main capital was RMB 14.36 million, with a net outflow of RMB 11.97 million from extra-large orders and RMB 2.39 million from large orders, while the net inflow of small orders reached as high as RMB 35.89 million, accounting for 1.50%[1]. This capital structure indicates that the day’s rise was mainly driven by retail investors’ sentiment of chasing gains, which is a typical feature of theme speculation. In addition, the margin trading balance decreased by 15.32% month-on-month (data as of January 13), reflecting that leveraged capital is relatively cautious[6].

From the moving average system, the 5-day moving average is around RMB 41.5, and the 10-day moving average is around RMB 38. The current stock price has a large deviation rate from the short-term moving averages, indicating a demand for a technical callback. The daily limit price of RMB 47.99 is a strong short-term resistance level, and RMB 40 is an important psychological support level.

According to the 2025 third quarterly report data, the company achieved operating revenue of RMB 1.507 billion, a year-on-year increase of 7.96%, indicating that the business scale is still expanding[1]. However, the net profit attributable to shareholders was RMB 35.68 million, a year-on-year decrease of 9.37%; the non-recurring net profit was only RMB 5.03 million, a sharp year-on-year drop of 69.12%, reflecting significant pressure on the profitability of the company’s main business. The gross profit margin of 18.62% is at the lower-middle level in the industry, and the asset-liability ratio of 45.49% is within a reasonable range.

The company has significant technical barrier advantages. As the exclusive supplier of nanoscale positioning gratings, the company has full coverage in fields such as laser direct writing lithography machines, nanoimprint lithography machines, and mask inspection equipment, and is an important participant in the domestic semiconductor substitution strategy. The consolidation of Changzhou Weipu is expected to bring performance growth to the company, but the short-term fundamental improvement still depends on the implementation of orders and the progress of profitability recovery.

On the positive side, the company benefits from the long-term strategic theme of domestic semiconductor substitution, which is in line with the national policy orientation of independent and controllable development. The continuous increase in holdings of the lithography machine sector by institutions shows that professional funds are optimistic about this track. The company is accelerating industry chain integration through means such as the acquisition of Changzhou Weipu and strategic cooperation with Yudi Optoelectronics, with a clear strategic layout. The increase in chip concentration is conducive to the operation of main capital.

Risk factors also need to be paid attention to. First, the short-term increase is too large, and the 15.05% single-day rise has pushed the stock price into the overbought area, increasing the risk of a technical callback. Second, the main capital showed a net outflow on the day, and the margin trading balance decreased, reflecting that leveraged capital is relatively cautious. Third, the fundamental support is insufficient, and the sharp drop in non-recurring net profit indicates that the profitability of the main business has not yet improved. Fourth, attention should be paid to the risk of sector linkage. Recently, many theme stocks have issued risk warnings of suspension for inspection, and the stricter market supervision may affect the speculation enthusiasm[7].

In the short term, the enthusiasm of the lithography machine sector and the emotional support brought by M&A catalysts still exist, but the excessive technical deviation rate needs time to be digested. Considering the obvious characteristics of main capital outflow and retail investors chasing gains, the stock price needs to retest the support of the 5-day or 10-day moving average. Investors should be cautious about chasing highs, and can wait for entry opportunities after the retest.

In the medium term, the stock price performance will mainly depend on the performance contribution of Changzhou Weipu after consolidation, the implementation of domestic substitution orders, and the progress of the company’s profitability improvement. If positive changes occur in fundamentals, coupled with the boom cycle of semiconductor equipment, the stock price is expected to receive further support.

In the long term, as a core target in the lithography machine industry chain, the company has strategic allocation value under the general trend of domestic semiconductor localization. However, it is necessary to continuously pay attention to uncertain factors such as the technology verification cycle, changes in the market competition pattern, and industry policy trends.

It is recommended that investors focus on the following indicators: the performance contribution of Changzhou Weipu after consolidation in late January; the specific implementation progress of the strategic cooperation with Yudi Optoelectronics; changes in institutional capital attitudes, including fluctuations in margin trading balance and changes in the number of shareholders; and the improvement of profitability indicators such as the company’s gross profit margin and non-recurring net profit.

[1] Eastmoney.com - SuDaVig (300331) Capital Flow Data

[2] Display Times Network - SuDaVig Completes Acquisition of 51% Equity in Changzhou Weipu

[3] Sohu Finance - SuDaVig Completes Industrial and Commercial Change for Acquisition of Changzhou Weipu

[4] Sina Finance - SuDaVig Reaches Strategic Cooperation with Shanghai Yudi Optoelectronics

[5] Caifuhao - Panoramic Sorting of Core Targets in the Lithography Machine Industry Chain

[6] Securities Times Network - GEM Stocks Margin Trading Balance Growth Ranking

[7] Phoenix Net Finance - Risk Warning of Suspension for Inspection of AI Leading Stocks