Shares of GigaDevice Semiconductor (3986.HK) plunged to HK$629.00 on July 14, dropping 15.3% in a single session after cornerstone investors — the big-name funds that bought in early during the company's Hong Kong listing — saw their mandatory lock-up period expire, freeing roughly 14.39 million H-shares for sale. GigaDevice Sinks 15% as Early Investors Dump Shares — Can a Profit Boom Absorb the Flood of New Supply?
Shares shifted violently as GigaDevice Semiconductor (3986.HK) cratered 15.3% to HK$629.00, erasing roughly HK$75 billion in market value in one session. The trigger: approximately 14.39 million H-shares held by cornerstone investors — the big-name backers who bought in at GigaDevice's January 2026 Hong Kong listing — became freely tradable around July 13, and selling hit immediately. The drop compounds a brutal stretch that has seen the stock halve from its 52-week high of HK$1,248.
The Lock-Up Dam Has Broken — And More Water Is Coming
Under Hong Kong rules, cornerstone investor lock-up periods are typically six months.
GigaDevice's cornerstone investors include China Pinnacle Equity Management, Yunfeng Capital, Xiaomi, TCL Industries, and Huaqin Technology. Many bought at the IPO price of HK$162 — meaning even at today's crushed level of HK$629, they are sitting on nearly a four-fold gain, giving them every incentive to take profits. July is the peak month for cornerstone investor expirations across Hong Kong, with a single-month scale exceeding HK$200 billion — meaning GigaDevice is just one of dozens of stocks competing for buyer attention.
A Blockbuster Earnings Report Wasn't Enough to Stop the Rout
Just days before the lock-up expired, GigaDevice disclosed stunning numbers. The company expects first-half 2026 revenue of approximately CNY 11.5 billion, up about 177% year-on-year.
First-half net profit is forecast at roughly CNY 6.9 billion, a year-on-year surge of approximately 1,099%. Memory chip supply tightened in the first half, lifting both volumes and prices. Yet the market shrugged off the blowout because roughly CNY 2 billion in non-recurring gains — from pre-IPO investments in other companies — already exceed GigaDevice's full-year 2025 net profit, raising quality-of-earnings concerns.
The Broader Chip Selloff Is Amplifying the Pain
GigaDevice isn't falling in isolation. Semiconductor stocks in the Hong Kong market have extended losses broadly, with Montage Technology, Huahong, and SMIC all declining over 11%. Geopolitical tension over U.S. chip export curbs and fears that AI infrastructure spending may have peaked are slamming the sector just as the supply wall hits.
What Comes Next Could Define the Stock's Year
GigaDevice itself cautioned that the memory chip industry has historically exhibited significant cyclical volatility and that future performance may be affected by changes in supply-demand dynamics.
The company's next earnings report is due August 19, 2026 — a test of whether surging fundamentals can finally overpower the technical selling pressure. Until then, supply — not demand — is writing GigaDevice's price.