By Tom Bemis FTX Founder and CEO acquires 7.6% stake in hard-hit online brokerage The billionaire founder of cryptocurrency exchange FTX has taken a big stake in a company at the heart of the meme-stock mania in early 2021. Samuel Benjamin Bankman-Fried acquired the shares over a two-month period starting in March. Bankman-Fried ranks 171st on the Bloomberg Billionaires Index with a net word of $11 billion. Over the period, he accumulated a 7.6% stake in the firm at weighted average prices ranging from $8.28 a share to $13.53. In total, Bankman-Fried acquired 56,273,469 shares, according to an…