TSMC (TSM) plans block sale of 152 million Vanguard shares, cutting stake to 19%

TSMC said on May 15, 2026, it plans to sell up to 152 million shares in Vanguard International Semiconductor through a block trade to financial institutional investors, reducing its stake in the chipmaker. The sale would cut TSMC’s holding in Vanguard, also known as VIS, to about 19% from roughly 27.1% on a fully diluted basis. TSMC said it does not plan to sell additional VIS shares in the foreseeable future.