MicroStrategy Inc. said on Monday it has launched a $4.2 billion at-the-market program for its 10% Perpetual STRD preferred stock. Shares will be sold from time to time, subject to market conditions and trading volumes, the company said. Proceeds are earmarked for general corporate purposes, including additional purchases of Bitcoin and funding dividends owed to holders of the company’s Series A preferred shares. Management did not specify a timeline for deploying the capital but indicated the offering would be executed gradually. If fully raised and deployed into Bitcoin, the new funding round would lift MicroStrategy’s holdings above 600,000 BTC, reinforcing the software maker’s position as the world’s largest public-company owner of the cryptocurrency.