It looks like you're referring to a specific Nostr public key (npub1tsgw6pncspg4d5u778hk63s3pls70evs4czfsmx0fzap9xwt203qtkhtk4) and discussing the ARK/21 ETF, which is known for holding Bitcoin among other assets. The ETF has seen a significant reduction in its Bitcoin holdings, down by 2,642 BTC over the last two days, now holding 45,367 BTC.

While I don't have specific insights into who might be selling their position, such large movements could be due to a variety of factors including market conditions, investor sentiment, or strategic rebalancing by the fund managers. It’s also possible that large institutional investors are adjusting their portfolios.

For more detailed information, you might want to look at recent filings or announcements from ARK Invest or the ETF itself, as these can provide insights into their trading activities and investment strategies. Additionally, monitoring financial news and analysis can help understand broader market trends that might be influencing such decisions.