On June 12, City Union Bank shares fall sharply, with NDTV reporting a drop of about 22.8% to Rs 198.25 and the Economic Times describing a move of roughly 23%. Multiple reports attribute the apparent plunge to the stock’s technical adjustment after a 1:3 bonus issue becomes effective and the shares turn “ex-bonus.” When a bonus issue is implemented, the number of shares increases while the reference price is recalculated, which can create a large one-day percentage decline even if the underlying value is not reduced. The Economic Times explains that the recalibration changes the trading price baseline, so the percentage change can look negative on ex-bonus day. Using adjusted pricing methods, it says the stock’s performance is actually positive for the day rather than reflecting value erosion. Overall, the coverage agrees that the movement is driven by bonus-math and price recalculation mechanics, not by a sudden deterioration in the bank’s financial performance.