The phrase "biggest holder" refers to the person or entity that has the largest quantity or ownership of something. It means they possess more of it than anyone else. Full definition
Some ICOs / big holders trying to get rid of it because of the ongoing investigations or other information we don't know yet? (links2exchange.net)
Criminals have been going after big holders of Bitcoin and Ether, taking advantage of the ease with which vast virtual currency riches can be transferred. (nytimes.com)
Head says it is a «wide, open register» where big holders like Stehr sat alongside plenty of small retail shareholders. (afr.com)