TRANSPORTADORA DE GAS DEL NORTE is trading 7.81% down now at $2.12, with no company-specific announcement identified to explain the September 29 move. - Its latest major company news was the Manuel Belgrano pipeline plan, announced September 17; it was not identified as a clear trigger. - On September 28, the Merval fell 3.28%, and TGN and other gas-sector shares also declined, indicating wider local-market pressure but not establishing a cause for the live move.