(Bloomberg) -- Just over a month after announcing plans to raise $21 billion through stock sales to help fund additional purchases of Bitcoin, MicroStrategy Inc. is already almost halfway to its goal.Most Read from BloombergRiyadh Metro Partially Opens in Bid to Ease City’s Traffic JamsAs Wars Rage, Cities Face a Dark New Era of Urban DestructionThe company sold 3.7 million shares over the past week and used the proceeds to buy another $1.5 billion worth of Bitcoin, the fourth consecutive weekly