The largest U.S. startup funding rounds were reported this week, with investment slowing, but security and AI remained top sectors. The biggest round was a $375 million Series B for consumer privacy and security platform Cloaked. Other notable financings included $143 million for AI infrastructure, biotech, healthcare, and robotics. Oasis Security secured $120 million in a funding round backed by DFJ Growth and Northzone, valuing the company at over $1 billion. Meanwhile, social network Bluesky raised a previously unannounced $100 million SeriesB round led by Bain Capital Crypto. Other top U.K. companies included XBow, Oasis security, and Cape, a recently launched privacy-focused mobile network.