Chris Hipkins will have some questions for Michael Wood over revelations he hadn't declared his shares in Auckland Airport.

The Transport Minister didn't immediately declare the shares as soon as he became an MP, or as soon as he took up the transport portfolio, mistakenly believing they were held in a trust which he had declared.

Wood then publicly declared them in January last year, after learning that wasn't the case.

The Prime Minister told Mike Hosking he'll be seeking information, before determining what happens next.

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