Hong Kong, 20 March 2026—Under Rule 22 of the Hong Kong Code on Takeovers and Mergers, Morgan Stanley & Co. International plc, a Class (5) associate of the offeror in the proposed privatisation of ENN Natural Gas Co., Ltd., disclosed Delta-1 hedging transactions in the target’s A-shares on 19 March 2026.

• Purchase side: 21,300 A-shares were bought for RMB 489,629.00, at prices ranging from RMB 22.67 to RMB 23.31 per share. • Sale side: 1,500 A-shares were sold for RMB 34,212.00, at prices between RMB 22.51 and RMB 23.31 per share.

Net result: Morgan Stanley accumulated 19,800 shares, representing a cash outflow of RMB 455,417.00. All trades were executed on its own account for hedging Delta-1 products arising from wholly unsolicited, client-driven orders.

The disclosure forms part of the ongoing documentation requirements during the scheme-of-arrangement process for privatising ENN Natural Gas Co., Ltd. Morgan Stanley & Co. International plc is ultimately owned by Morgan Stanley.