Free stock trading: E*Trade competitor Robinhood raised $363M in a Series D round that brought valuation up to $5.6B. DST Global led with participation from Iconiq, Kleiner Perkins, Sequoia, and Capital G. Total fundraising now totals $539M. The free stock trading app claims 4M users and says it has passed $150B in transaction volume.

Datacenter OS: T. Rowe Price and Hewlett Packard Enterprise participated in a $125M Series D round for Mesosphere, creator of a datacenter OS. The round brought total funding up to nearly $250M. T. Rowe co-led with Koch Disruptive Technologies with participation from ZWC Ventures, Disruptive Technology Advisers, Andreessen Horowitz, and Two Sigma Ventures, to name a few.

Restaurant management: Alibaba and Ctrip.com invested $63M in a Series D1 round for Meiweibuyongdeng, a Chinese app for managing restaurant bookings.

The round values the startup at $631M. Meiweibuyongdeng has partnerships with 100K restaurants across more than 200 cities throughout China.

ADHD treatment: Amgen’s venture capital arm participated in a $55M Series C round in Akili Interactive, creator of a prescription video game treatment for ADHD. Temasek led the round with participation from Baillie Gifford and Merck KGaA. Akili recently posted positive data from a pivotal clinical trial for therapeutic game AKL-T01. Randomized participants played the game for four weeks and performed better on an attention score than those who played a nontherapeutic control game.

Pear Therapeutics received regulatory approval last year to sell its mobile treatment app in the US, but that app was for substance-use disorder, not ADHD. Enterprise AI: Intel Capital led a $20M Series A round in Gamalon, which uses natural language processing to help companies interpret customer communications.

Total funding now amounts to $32M. Gamalon’s newest tool is called Idea Studio and automatically builds learning trees to help enterprise users find answers or developers create a more customized learning tree faster.