Caterpillar Inc $8,653,248 Global Brass & Copper Holdings, Inc. $274,938 Lockheed Martin Corp $1,978,720 United States Steel Corp $38,171,749 Caterpillar Inc $8,653,248 Global Brass & Copper Holdings, Inc. $274,938 Lockheed Martin Corp $1,978,720 United States Steel Corp $38,171,749