On August, 2025, the Beijing Trademark Association celebrated its 30th anniversary with a landmark Trademark Development Conference. During the event, Mozlen officially unveiled the "Beijing Trademark Agencies T300" list.

Developed under the guidance of the Beijing Trademark Association, the T300 ranking is built on a comprehensive and rigorous evaluation system. The assessment covered a wide range of performance indicators. From this exhaustive evaluation, 300 outstanding agencies were selected as industry leaders. Chang Tsi & Partners was named to the Tier 1 of the T300, underscoring the firm’s professional excellence, international vision, and long-standing contributions to advancing trademark protection.

As a Member of the China Trademark Association and the Beijing Trademark Association, Chang Tsi & Partners has consistently been recognized by international legal ranking institutions as one of the top trademark firms in Greater China Region. The firm provides clients with comprehensive services spanning domestic and international trademark filings, portfolio management, enforcement, and strategic planning. Its expertise extends to market monitoring, administrative enforcement, customs protection, infringement litigation, licensing, due diligence, and brand value enhancement.

The firm’s reputation is reinforced by its ability to handle complex, high-stakes disputes for leading domestic and global brands. Chang Tsi has successfully secured cross-class protection, well-known trademark status, and favorable judgments in landmark litigation, building a track record of cases that set important precedents in the IP field.

Founded in 2002, Chang Tsi & Partners has embraced internationalization as a key growth strategy. In addition to its strong domestic presence, the firm has established offices in the United States and Singapore, supporting Chinese companies as they expand globally and face increasingly sophisticated IP challenges abroad. Through this global network, the firm has become a trusted partner for enterprises seeking to protect and maximize their brand assets worldwide.