Riot Platforms (NASDAQ:RIOT) stock is in the news Wednesday as Bernstein analysts have a lot of positive things to say about Bitcoin (BTC-USD) mining companies.A new research note from Bernstein claims that Bitcoin mining companies have fallen behind recently. That’s despite the positive rallies for BTC and growing number of spot exchange-traded funds (ETFs).However, the Bitcoin halving is coming up later this week and that could be a positive catalyst for the companies, Riot Platforms included. This will r ...