HubSpot has made its first startup investment to cover a blind spot in inbound marketing.

The Cambridge marketing tech company announced on Monday it participated in the $10.3 million Series B round as a strategic investor for Atlanta-based Terminus, which provides account-based marketing software. Company spokeswoman Ellie Botelho confirmed to me that this is the company's first investment in a startup.

"It's a meaningful step in our ongoing mission to move from being an applications company to a platform company," Botelho said of the acquisition.