The Participant shall become 100% vested in the Stock Units granted hereunder upon the date (the “vesting date”) that is the earliest to occur of (a) the date of Northern’s 2018 Annual Meeting of Stockholders (the “regular vesting date”), (b) the date of the Participant’s death, or (c) the date of a Change in Control, provided that the Participant has not incurred a Separation from Service, as defined in Paragraph 7(c) below, prior to the earliest of the foregoing three events.