A break-up of United Technologies is likely unless the stock appreciates significantly, UBS analyst Steven Winoker tells investors in a research note following the company's investor day. The analyst's break-up valuation improved to $154 per share at the current midpoint, from $146 last week, following United's comments. Winoker does see advantages to United Technologies' scale as one company and has concerns "with potential disruption/ inefficiencies," but he adds: "at the end of the day, we think UTX will break-up if its value is not realized in its current form." The analyst keeps a Buy rating on the shares with a $155 price target.