Counting bonus shares that will only vest if they hold their shares for a minimum of three years, trusts associated with Heffernan bought two lots of 6,200 shares, while Trigg bought 10,100 shares.
General manager of operations, Fraser Whineray, retail general manager James Munro, and chief financial officer William Meek did not buy shares in the May 10 float, which saw 113,000 New Zealand retail investors buy 49 per cent of the company along with local and foreign institutional investors.
The government retains a controlling 51 per cent interest.
The existing bonus scheme ties bonus payments to the company's "total shareholder return performance relative to benchmarks."
However, the new plan will benchmark performance to MRP's share price performance against the NZX50 index of the country's top 50 listed companies, with half of the available bonuses payable if MRP performs above the 50th per centile for the index.
They will be eligible for their total bonus if the shares perform at or above the 75th per centile for the index.
MRP is New Zealand's second largest listed electricity company, after Contact Energy and displacing TrustPower, and is expected to be included in the NZX50, perhaps in July, once it has satisfied NZX rules requiring shares to trade and demonstrate their qualification for inclusion.