Coinbase will adjust the pre-IPO perpetual contract index for Anthropic and migrate contracts.

Coinbase Assets plans to adjust the index benchmark for its pre-IPO Anthropic perpetual contracts at 18:00 on November 16th, changing it from a valuation index based on 1 billion shares to a price per share index based on 13.116 billion shares. Trading will be temporarily suspended during the adjustment period, and all outstanding ANTH orders will be cancelled. Existing ANTH perpetual contract positions on Coinbase Markets will be migrated to economically equivalent ANT perpetual contract positions via zero-fee block trades. After the migration, ANTH will be delisted, and ANT will be available for trading.