Westlake Village-based PennyMac Mortgage Investment Trust reported net income of $35.4 million, or 55 cents per share, for the fourth quarter of 2018 ended Dec. 31. This is up from $34.6 million, or 50 cents per share, in the same quarter last year, according to a Feb. 7 news release. PennyMac Financial Services, a sister-company…