They update their holdings every day at https://ark-funds.com/investor-resources...

They update their holdings every day at https://ark-funds.com/investor-resources - I've been scraping that to https://github.com/tigger0jk/ark-invest-scraper for almost a month now (I did not make this website).

They also will email you daily trade notifications if you request them: https://ark-funds.com/subscribe (I'm not scraping those)