From the time of the offer announcement on August 15 until its eventual close on November 30 - following multiple extensions - the independent directors maintained their consistency in relation to the offer and continued to refute the claims made in multiple communications by the offerors, the association said.
At the time of the offer close, the offerors held a total of 85 per cent of Tilt shares – less than the required threshold for takeover.
Less than three years later, Tilt entered a scheme of arrangement that saw shareholders receive a total of $8.10 per share in July 2021.
"While the extent of value gain was not predicted in 2018, the achievement of any value greater than the original takeover offer price vindicated the stance of the Independent directors at the time," the association said in a statement.
"The stance taken by the independent directors of Tilt, led by Fiona Oliver, is an outstanding example of principle and courage," NZSA board member Martin Watson said.
"Minority shareholders who retained their holdings in Tilt can be very thankful that their interests were represented so well," Watson said.
"All other shareholders in NZX-listed companies can also appreciate what an outstanding example this sets for directors who are charged with representing their interests."
NZSA chief executive Oliver Mander added: "The conduct of the Tilt independent directors demonstrates the value to shareholders of a strong, independent voice on a company board."
Recent winners of the award include Rob Campbell, Brian Gaynor, Sir Stephen Tindall, Don Braid, Tony Carter and Joan Withers.