• Billionaire investor Darwin Deason has sued Xerox to block its proposed merger with Fujifilm.
• Shares of Xerox sank more than 3% on the news; Fujifilm was also down.

Shares of Xerox plunged as much as 3.35% Tuesday morning after one of its largest shareholders, billionaire Darwin Deason, filed a lawsuit against the company to block its proposed merger with Japan's Fujifilm...