What are some MIT startups that had huge exits?

Kiva Systems, a warehouse automation company co-founded by MIT alumni Mick Moutz in 2003, was acquired by Amazon for $775 million in 2012.  Kiva was rebranded "Amazon Robotics" in May 2015.

Hubspot, a company offering an inbound marketing platform, was co-founded by MIT Sloan alumni Brian Halligan and Dharmesh Shah in 2006.  Hubspot went public in 2014 and is a unicorn in the area.

Okta, the leading independent provider of identity for the enterprise., went public in 2017 and is a unicorn.

Pillpack, a full-service pharmacy that sorts your medication by the dose and delivers to your door, was acquired by Amazon for just under $1b in 2018.