Grayscale Investments, whose application to turn its Bitcoin Trust (GBTC) into a U.S. spot exchange-traded fund (ETF) is being considered by the Securities and Exchange Commission, said Barry Silbert resigned as chairman and will be replaced by Mark Shifke. Shikfe , chief financial officer of Grayscale owner DCG , will replace Silbert as of Jan. 1, Grayscale said in an SEC filing without giving a reason for the changes. Mark Murphy, DCG’s president, also resigned from the board. The SEC has delayed several ETF applications including those of Grayscale, BlackRock, Ark 21shares, Vaneck and Hashdex, many of which have met with the regulator and filed amended documentation as year-end approaches. The agency must approve or reject Ark 21Shares, the first deadline to approach, by Jan. 10.