Fidelity Investments, Endo Health Solutions's (ENDP) largest shareholder, wants a sale, sources say, reports Bloomberg. It may be the company's best hope at regaining investor confidence after losing more than $1B in market value, or to undo the acquisitions that built the company. Endo has the lowest valuation in the U.S. specialty pharmaceuticals industry, according to Bloomberg data. On average, analysts see Endo getting at least a 26% premium in a deal. Teva Pharmaceutical Industries (TEVA) or Covidien Plc (COV) could go after parts or all of Endo, according to Stifel Financial Corp. Gabelli & Co. said Endo could break up or sell its pain drugs to Warner Chilcott Plc (WCRX) or Valeant Pharmaceuticals International (VRX).