The family behind Walmart cashed out $1.5 billion as the stock neared an all-time high last week

• The Walton family sold nearly 9 million shares of Walmart stock last week for over $1.5 billion.
• The sale brings the family's total proceeds to nearly $2.3 billion in the span of three months.
• Monday's three-to-one stock split means the Waltons now hold about 3.75 billion shares.

The Walton family's cash accounts are a whopping $1.5 billion bigger after they sold nearly 9 million shares of Walmart stock last week, according to SEC filings.