Hut 8 Mining Corp. (NASDAQ:HUT) tracked higher during Tuesday’s premarket trading session as the stock increased its Bitcoin (BTC-USD) average production rate. Also in the green are shares of CoStar Group, Inc. (NASDAQ:CSGP), as it enters the S&P 500. MannKind Corporation (NASDAQ:MNKD) also gained after positive Phase 1 data for a lung disease treatment.Bed Bath & Beyond Inc. (NASDAQ:BBBY) has plunged by more than 15% as the retail chain mourns the death of Chief Financial Officer Gustavo Arnal.GainersHut 8 Mining Corp. (HUT) gained 2.1% as the organization reported an increase in its Bitcoin (BTC-USD) holdings by 375 in the period ending August 31. HUT’s average production rate is now leading to a rate of ~12.1 Bitcoin/day, which is up 14% from July’s average production rate of 10.61 Bitcoin/day.CoStar Group, Inc. (CSGP) popped 7.2% after news came out that the real estate marketplace stock will be joining the S&P 500 as part of quarterly rebalancing.MannKind Corporation (MNKD) moved higher by 1.1% in early market trading as the biopharma organization announced its plans to further develop clofazimine inhalation suspension for nontuberculous mycobacterial lung disease.DeclinerBed Bath & Beyond Inc. (BBBY) shares have dropped 15.9% on Tuesday’s premarket trading session after the retailer confirmed that Chief Financial Officer Gustavo Arnal had died. BBBY officially announced his passing hours after published r...