On May 29, 2026, Beijing Tianyi Shangjia High-tech Materials Co., Ltd. (referred to as "*ST Tianyi", 688033) and Liaoning Dingjide Petrochemical Co., Ltd. (referred to as "Dingjide", 603255) both announced they are under investigation by the China Securities Regulatory Commission for suspected violations of information disclosure regulations.

The simultaneous probes into these two companies not only put pressure on their stock prices but also served as a stark warning to investors by exposing typical paths of regulatory non-compliance. Corresponding channels for compensation claims have been swiftly opened.

Lawyer Liu Peng from Shanghai Huzi Law Firm stated that affected investors can send their contact information to suopeibao@126.com to register for preliminary claim proceedings.

**Liaoning Dingjide Petrochemical Co., Ltd (603255)**

Unlike *ST Tianyi, Dingjide's investigation extends beyond the company itself to include its actual controller. While the announcement did not specify the exact reasons, clues can be found in the company's past disclosures.

In July 2025, the company received and responded to an inquiry from the Shanghai Stock Exchange regarding a complex case of non-operational fund occupation by the actual controller. It was disclosed that Dingjide's subsidiary, Petrochemical Technology, transferred approximately 305 million yuan to nine trading companies under the guise of "material procurement."

However, investigations revealed that about 201 million yuan of these funds, after passing through multiple layers, ultimately flowed back into the company as capital contributions from the actual controller, Zhang Zaiming, and his related parties, constituting a de facto occupation of company funds. The company stated these funds have been fully repaid.

Nevertheless, despite the repayment, the act had already occurred, and regulators can still impose retrospective penalties. If subsequent investigations confirm that actual controller Zhang Zaiming indeed directed this fund occupation and failed to disclose it truthfully, he will face administrative penalties.

**Beijing Tianyi Shangjia High-tech Materials Co., Ltd (688033)**

In contrast, *ST Tianyi's situation is more severe. The announcement indicates the company is under investigation for suspected information disclosure violations. While the wording of the announcement is brief, it follows a series of governance crises.

On May 28, *ST Tianyi disclosed that funds from its subsidiary's dedicated fundraising account had been judicially deducted and warned of multiple risks including delisting and litigation, indicating extremely precarious financial and operational conditions.

In terms of performance, the company reported a net loss attributable to shareholders of 2.235 billion yuan for 2025. Beyond continuous losses, its 2025 annual report received a "disclaimer of opinion" from its auditors, and its internal controls received an "adverse opinion," directly triggering a delisting risk warning (ST). Notably, the company has already applied for pre-reorganization.

Although the Beijing First Intermediate People's Court decided to initiate the pre-reorganization procedure, this does not mean the company has entered formal reorganization. Pre-reorganization is a procedure before the court formally accepts a reorganization application, and its success is uncertain.

For the vast number of minority shareholders, the most direct impact is the sharp drop in stock price and the beginning of the fight for compensation. The case of *ST Tianyi sounds another alarm for "strict regulation" under the registration-based system.

**Conditions for Investor Claims**

For investors, while paying attention to a company's fundamentals, it is crucial to actively use legal tools to reduce losses caused by disclosure violations through compensation claims.

Lawyer Liu Peng from Shanghai Huzi Law Firm pointed out that according to the Securities Law and related judicial interpretations, listed companies that cause investor losses due to information disclosure violations should bear civil liability for compensation.

For Dingjide: Investors who purchased shares on or before May 29, 2026, and sold or still held them after May 30, 2026, incurring losses.

For *ST Tianyi: 1. Investors who purchased shares between March 13, 2024, and March 14, 2024, and sold or still held them after March 15, 2024, incurring losses. 2. Investors who purchased shares on or before May 29, 2026, and sold or still held them after May 30, 2026, incurring losses.

The above periods are preliminary judgments, and the final determination is subject to court rulings. Eligible investors can register for claims by sending their contact information to suopeibao@126.com.