MicroStrategy (MSTR.US), a publicly traded company in the US, stands out in this wave of buying. According to disclosures, MSTR has announced approximately 40 purchases of Bitcoin over the past four years. As of now, MSTR holds over 400,000 Bitcoins, accounting for about 1.5% of the global total supply of Bitcoin, making it the largest publicly traded company holder of Bitcoin in the world. While aggressively buying Bitcoin, MicroStrategy's stock price has also soared; as of last Friday (December 20), MSTR has risen by 477% year to date.