The grades of 4 Diversified Financial Services stocks are better this week, according to the Portfolio Grader database. Every one of these stocks has an “A” (“strong buy”) or “B” overall (“buy”) rating.

This week, Berkshire Hathaway Inc. Class B (BRK.B) pushes up from a C to a B rating. Berkshire Hathaway Inc. Class B is a publicly owned investment manager that primarily engages in the insurance and reinsurance of property and casualty risks business. The company also gets A’s in earnings surprise. For more information, get Portfolio Grader’s complete analysis of BRK.B stock.

Leucadia National Corporation (LUK) earns a B this week, jumping up from last week’s grade of C. Leucadia National Corporation is involved in a variety of businesses, including manufacturing, telecommunications, property management and services, gaming entertainment, real estate activities, medical product development and winery operations. The company also gets A’s in earnings surprise and earnings momentum. For more information, get Portfolio Grader’s complete analysis of LUK stock.

This week, PICO Holdings, Inc.’s (PICO) ratings are up from a C last week to a B. PICO Holdings, Inc. owns and operates real estate properties in the United States as well as owns land and the related mineral rights and water rights in Nevada. The company also gets A’s in sales growth. For more information, get Portfolio Grader’s complete analysis of PICO stock.

China Commercial Credit, Inc. (CCCR) is seeing ratings go up from a B last week to a A this week. The company also gets A’s in sales growth and earnings momentum. For more information, get Portfolio Grader’s complete analysis of CCCR stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.