Shares of companies in the cryptocurrency business powered higher Monday, after bitcoin rallied toward a fourth-straight gain, and the first close above the 22,000 in a month. Among those that are all about crypto, shares of Marathon Digital Holdings Inc. shot up 23.3%, Riot Blockchain Inc. ran up 18.3% and Coinbase Global Inc. climbed 13.8%. Among other companies with significant crypto exposure, MicroStrategy Inc.’s stock jumped 11.2% and Signature Bank surged 3.9%. Meanwhile, bitcoin charged up 6.6% to $22,183, and has soared 14.6% in four sessions since closing at a 19-month low on July 12, toward the highest…