Cathie Wood's Ark Invest snapped up $35 million of Shopify stock as the e-commerce company suffered one of its worst-ever trading days

• Cathie Wood's Ark Invest increased its Shopify holdings as the company's shares plummeted Thursday. 
• The ecommerce platform posted weak guidance, causing the stock to nosedive 17% in one of its worst sessions. 
• The money manager is buying the dip, as it has done with companies like Coinbase and Tesla.

Cathie Wood's Ark Invest purchased $35 million worth of Shopify as the company endured one of its worst trading days in history.