The GraniteShares 2x Long Coinbase Daily ETF (CONL) closed down 6.34% at $40.61 on December 27, as shares of Coinbase Global, Inc. (COIN) fell 2.97% to $266.25 amid insider selling activity. The decline in Coinbase shares was exacerbated by Director Frederick Ernest Ehrsam III selling 11,421 shares, which contributed to a 52.30% decrease in his position. This insider activity, coupled with a broader market downturn, pressured Coinbase's stock. Additionally, the market faced headwinds from rising long-term Treasury yields, which affected major indexes and tech stocks, including those linked to cryptocurrencies.