X0306 4 2015-12-15 0 0000078460 PIEDMONT NATURAL GAS CO INC PNY 0001602086 MAYO JUDY Z C/O PIEDMONT NATURAL GAS PO BOX 33068 CHARLOTTE NC 28233 0 1 0 0 Vice President Common Stock 2015-12-15 4 A 0 3435 0 A 12206.9 D Issued as accelerated vesting of 2016 LTIP Award and 2017 LTIP Award under registrant's Incentive Compensation Plan. These shares are restricted, subject to full or partial cancellation under certain circumstances and for such period as described in the form of Share Repayment Agreement filed by the registrant in a Form 8-K on December 16, 2015. Shares were valued at closing price of $56.85 on December 14, 2015, which was the day prior to vesting. /s/ Judy Z. Mayo 2015-12-17