Well, this is interesting.
On December 22, 2018 7:29 PM UTC, 3,218,596.49 SUB was transferred from Substratum’s crowdsale wallet to “Holding Wallet A”.
On February 15, 2019 8:07 AM UTC, Binance announced the delisting of SUB from its trading platform.
On February 15, 2019 9:56 AM UTC, 3,218,596.49 SUB was transferred from “Holding Wallet A” to “Holding Wallet B”.
On February 15, 2019 10:14 AM UTC, 3,218,596.49 SUB was transferred from “Holding Wallet B” to Binance.
On February 15, 2019 3:22 PM UTC, Substratum CEO makes a public statement regarding the Binance delisting on Twitter.
Thank you to @PieEpi2 for connecting the dots.