Charles Schwab Corp.’s stock SCHW, -1.41% was up by 0.4% in premarket trading on Wednesday after the broker’s fourth-quarter profit topped analyst estimates, although its revenue fell slightly short. Schwab’s fourth quarter profit dropped by about half to $1.05 billion, or 51 cents a share, from $1.97 billion, or 97 cents a share, in the year-ago quarter. Adjusted fourth-quarter profit of 68 cents a share beat the FactSet consensus estimate of 64 cents a share. Revenue dropped by 19% to $4.46 billion from ...