Optical Fiber Stocks Rally on Aug 12, 2026; Tongding Hits Limit, Changyingtong Surges 11%
On August 12, 2026, optical fiber concept stocks strengthened in intraday trading. Tongding Interconnection hit the daily limit, while Changyingtong surged more than 11 percent. Other related names, including Changjin Photonics and Yongding Shares, also advanced. The broader communications equipment sector rose as well, with Yongding Shares and Tongding Interconnection both limit-up.
On August 12, 2026, the communications equipment sector moved broadly higher, with Yongding Shares and Tongding Interconnection hitting the daily limit. Changyingtong, Xintian Technology, and Canqin Technology led the gains. During the same period, the optical fiber concept segment was also active: Tongding Interconnection hit the daily limit, Changyingtong rose more than 11 percent, and other stocks such as Changjin Photonics, Yongding Shares, Weike Technology, Huiyuan Communication, Tianfu Communication, and Zhongbei Communication all posted notable gains.