8.   Employee Benefits and Compensation Plans

In January 2013, NCLH adopted the 2013 Performance Incentive Plan, which provided for the issuance of up to 15,035,106 of NCLH’s ordinary shares pursuant to awards granted under the plan. In May 2016, the plan was amended and restated (“Restated 2013 Plan”) pursuant to approval from the Board of Directors and NCLH’s shareholders. Among other things, under the Restated 2013 Plan, the number of NCLH’s ordinary shares that may be delivered pursuant to all awards granted under the plan was increased by an additional 12,430,000 shares to a new maximum aggregate limit of 27,465,106 shares. In May 2021, the Restated 2013 Plan was further amended and restated to increase the number of NCLH ordinary shares that may be delivered by 4,910,000 shares to 32,375,106 shares.

Share Option Awards

The following is a summary of option activity under NCLH’s Restated 2013 Plan for the six months ended June 30, 2021:

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Restricted Share Unit Awards

In June 2021, NCLH granted 3.1 million time-based restricted share unit awards to our employees, which primarily vest in substantially equal installments each March 1 over three years. Additionally, in June 2021, NCLH granted 0.7 million performance-based restricted share units to certain members of our management team, which vest upon the achievement of certain pre-established performance targets established through 2023 and the satisfaction of an additional time-based vesting requirement that generally requires continued employment through March 1, 2024.

The following is a summary of restricted share unit activity for the six months ended June 30, 2021:

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The compensation expense recognized for share-based compensation for the periods presented include the following (in thousands):

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