National Grid’s NYSE-listed ADR (NGG) is down about 9.65% to $83.40 in the latest session, a move that lines up with an ex-dividend reset rather than a fundamental shock. When a stock goes ex-dividend, buyers after the ex-date are no longer entitled to the next dividend, so the share price often adjusts lower by roughly the dividend amount (with the final move influenced by broader market conditions and day-to-day flows).

National Grid’s investor event calendar lists May 29, 2026 as the ex-dividend date for ADRs tied to the company’s 2025/26 final dividend. The same timetable shows the final dividend is scheduled to be paid on July 23, 2026, with the record date also listed as May 29, 2026. (nationalgrid.com)

The next major company catalyst on the calendar is National Grid’s 2025/26 full-year results on May 14, 2026, which can shift expectations for cash returns, financing needs, and regulated investment plans. If the market is also repricing utility yields or discount rates on the day, that can amplify the ex-dividend price step-down into a larger one-session move. (nationalgrid.com)