NEW YORK--(BUSINESS WIRE)--Halper Sadeh LLC, an investor rights law firm, is investigating whether certain officers and directors of DexCom, Inc. (NASDAQ: DXCM) breached their fiduciary duties to shareholders. If you currently own DexCom stock and are a long-term shareholder, you may be able to seek corporate governance reforms, the return of funds back to the company, a court-approved financial incentive award, or other relief and benefits. Please click here to learn more about your legal righ. ...