Key TakeawaysMicroStrategy shares, which gained 24% on Monday, moved lower in premarket trading Tuesday after the Bitcoin development company announced a 600millionconvertibleseniornotesofferingtobuymoreBitcoin.Thecompanypurchasedanadditional3,000bitcoinsbetweenFeb.15andFeb.25,takingitstotalholdingto193,000bitcoins.MicroStrategy′s2021highat1,315 may become a future support area on the chart if the price continues its upward momentum. MicroStrategy (MSTR) shares, which gaine ...