Billionaire Scorecard: Richest Walton Up $1.6 Billion, Zuckerberg Down $4.2 Billion

Each issue, Forbes tracks the billionaires who made and lost the most money since we last published. Here are the winners and losers from March 19 to April 8.

WINNERS

Christy Walton

+$1.6 billion

Net worth: $38.5 billion

Her Wal-Mart shares climb and a side investment in First Solar takes off, extending her lead in wealth over the rest of the Walton family.

Chip Wilson

+120 million

Net worth: $2.4 billion

A parting gift: He promised to resign as Lululemon's chairman after tumult in 2013; shares rebound on strong sales two months before his departure.

Alfred Mann

+$110 million

Net worth: $1.2 billion

Stock in his pharmaceutical company, MannKind , jumps 83% in a day after FDA advisors recommend approval of its diabetes drug Afrezza.

LOSERS

Mark Zuckerberg

-$4.2 billion

Net worth: $25.9 billion

Facebook plunges as investors question big purchases. Jan Koum's shares are down 15% since February acquisition of his company, WhatsApp.

Vince McMahon

-$360 million

Net worth: $1.2 billion

WWE's stock slides after FORBES quotes an analyst skeptical about the company's new streaming network, which has only 667,000 subscribers.

Micky Arison

-$150 million

Net worth: $6.2 billion

Carnival announces a quarterly loss as it discounts cruise prices and increases ad spending in the wake of high-profile mishaps.