21Shares pushes into altcoin ETFs with new SEI filing 21Shares filed an S-1 for a SEI ETF with Coinbase Custody, aiming to track SEIs performance. SEI traded at $0.29 at press time. The post 21Shares pushes into altcoin ETFs with new SEI filing appeared first on Crypto Briefing. Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment. Filed under: Bitcoin - @ August 28, 2025 9:26 pm