Feb 20 (Reuters) - The London Stock Exchange's new Private Securities Market is set to host its first deal in the coming weeks, ‌its CEO said on Friday, in what will be the first ‌transaction to take place under the UK financial regulator's new PISCES framework. The first transaction will involve ​the creation of an exchange-enabled investment structure, or a TPEIC, by TPE that will hold shares in Oxford Science Enterprises, an Oxford University-linked investment firm. The TPEIC, or Tradable Private Eq ...