According to BlockBeats, as of May 10, global Bitcoin ETFs held a total of 949,756 Bitcoins, which accounts for approximately 4.5% of the total supply. In addition, over the past week, US spot Bitcoin ETFs have collectively purchased an additional 1,318 Bitcoins. Notably, GBTC was the only ETF that experienced a capital outflow during this period.

This data, monitored by HODL15Capital, provides an insight into the current state of Bitcoin ETFs globally. The significant holdings of these ETFs underline the growing interest and investment in Bitcoin, particularly in the US. However, the capital outflow from GBTC indicates a potential shift in investor sentiment or strategy.

It's important to note that these figures represent a snapshot of the market as of May 10. The dynamic nature of the cryptocurrency market means that these figures can change rapidly. Investors and market watchers are advised to keep a close eye on these trends as they can significantly impact the overall cryptocurrency market.