According to Foresight News, on-chain detective ZachXBT tweeted that one of the major WBTC holders is a suspicious entity related to ransomware/pig-killing schemes. The holding data is as follows:

0xed805ac246f441ea0d057b81d910ef1e39eb5995 holds 1253 WBTC (US$73 million);

0x9a5c7630d327885ae849217702824e5835d3c5e0 holds 185 WBTC (US$10.8 million).