UL Solutions shares fall 10.24% after-hours after major shareholder sells 12.5M shares in secondary offering.

UL Solutions fell 10.24% in after-hours trading following a secondary public offering of 12.5 million Class A shares by major shareholder UL Standards & Engagement. The offering, which did not involve the company directly, increased market share supply and triggered investor concerns about potential dilution or the shareholder’s confidence in the stock’s valuation. Such sales often create downward pressure by signaling an oversupply of shares, particularly when executed by large stakeholders. The move aligns with the stock’s earlier 4.8% intraday decline, as the market reacted to the perceived risk of reduced earnings per share and potential overvaluation amid strong recent gains. While the company’s AI certification launch and other positive developments were announced, the secondary offering dominated the near-term sentiment, exacerbating the after-hours sell-off.