CRCL ▼ -1.3% - Circle Internet Group $CRCL Circle Launches Arc Mainnet, an Economic Operating System for the Internet Circle Internet Group shares declined 1.3% today following the company's announcement that it has launched Arc Mainnet, described as an economic operating system for the internet. The new platform launch, while a significant product milestone for the blockchain and cryptocurrency infrastructure company, did not generate sufficient investor enthusiasm to drive the stock higher on the day. 16-SEP-2026 06:40 AM ET