Kraken's tokenised stocks will be issued on Solana as SPL tokens, a standard similar to Ethereum’s ERC-20, and are reportedly expected to be tradable at any time

Quotes that support claims

Kraken said that stocks will be represented on Solana using SPL tokens, a token standard mirroring ERC-20 tokens on Ethereum.

xStocks, which will be issued on a public blockchain, are expected to trade around the clock.