Snowflake Inc (NYSE:SNOW) stock is down 3.9% before the bell, after a bear note from Wells Fargo. The analyst downgraded shares of the cloud computing company to "equal weight" from "overweight" and lowered its price target from $200 to $130, citing multiple headwinds.Separately, Warren Buffett's Berkshire Hathaway (BRK), sold the entirety of its stake in Snowflake. That equated to 6.1 million shares, or around $910 million.When we last covered SNOW in July, a historically bearish signal threatened to press ...